Earth and Space News: August 2024

Wednesday, August 28, 2024

Uranus Moon Perdita Was Found May 1999 in January 1986 Voyager 2 Images

Summary: Uranian moon Perdita was found May 18, 1999, in images taken Jan. 18, 1986, by Voyager 2 during the probe's flyby of the seventh planet from the sun.

Uranian moon Perdita was discovered Tuesday, May 18, 1999, in images obtained Saturday, Jan. 18, 1986, by Voyager 2 during the interstellar and planetary space probe's flyby of the seventh planet from the sun.

Perdita groups as one of 11 satellites of Uranus imaged by the National Aeronautics and Space Administration's (NASA) Voyager 2 during the robotic interstellar spacecraft's flyby of icy, planetary side-spinner Uranus from late autumn 1985 through winter 1986. Voyager 2 returned more than 7,000 photographs to the Voyager Science Imaging Team during the probe's observational Uranian encounter from Monday, Nov. 4, 1985, to Tuesday, Feb. 25, 1986, according to John Uri, NASA Johnson Space Center's History Office manager, in "35 Years Ago: Voyager 2 Explores Uranus," posted Jan. 22, 2021, on the NASA website.

The discovery of the new Uranian satellite 13 years 4 months after its appearance in Voyager 2 images taken Saturday, Jan. 18, 1986, was announced in International Astronomical Union Circular (IAUC) No. 4168, dated Jan. 27, 1986, by the publication's editor, British lost asteroid and comet tracker Brian G. (Geoffrey) Marsden (Aug. 5, 1937-Nov. 18, 2010). The discovery information was communicated by Erich Karkoschka, planetary scientist at the University of Arizona's (Arizona; U of A; UArizona; UA) Lunar and Planetary Laboratory (LPL) in Tucson, Pima County, south central Arizona. The new satellite appeared in seven Voyager 2 images that Karkoschka had compared with images obtained by the Hubble Space Telescope (HST), one of NASA's series of four Great Observatories satellites. The yet-unnamed Perdita was credited with an estimated diameter of 40 kilometers, based upon an assumedly similar albedo to that of proximitous satellites, and an orbital radius of 76,416 kilometers.

The Voyager 2 probe's instrumentation includes a two-camera system comprising a wide-angle camera with a focal length (f) of 1500 millimeters (mm)and a narrow-angle camera with a focal length of 200 millimeters. As with all Uranian satellites imaged by Voyager 2, Perdita was found in 15.36-second exposures obtained by the space probe's narrow-angle camera, according to W.M. Owen Jr. and S.P. Synnott in "Orbits of the Ten Small Satellites of Uranus" (page 1268), published in the May 1987 issue of The Astronomical Journal.

Yet-unnamed Perdita, labelled as rediscovered Uranian inner satellite S/1986 U10 (lower left), in Hubble Space Telescope (HST) Advanced Camera for Surveys (ACS) High Resolution Channel (HRC) image, exposure date Aug. 25, 2003, created from HST data from proposal 9823; M. Showalter (Stanford University/NASA Ames) and J. Lissauer (NASA Ames); image release date September 25, 2003 11:00AM (EDT); Release ID 2003-29: May be freely used as in the public domain, via NASA Hubblesite

Perdita is categorized as an inner satellite. The orbit of Miranda, the innermost and smallest of the system's five major satellites, parameterizes the Uranian system's 13 inner satellites. Perdita's orbit lies between the ν (nu) and μ (mu) rings, the respectively 12th and 13th outermost rings in the Uranian system.

Perdita qualifies as one of nine members of the Portia Group of Uranian satellites. The Portia Group is headed by and named after its largest member, Portia (S/1986 U1). Belinda (S/1986 U5), Bianca (S/1986 U9), Cressida (S/1986 U3), Cupid (S/2003 U2), Desdemona (S/1986 U6), Juliet (S/1986 U2) and Rosalind (S/1986 U 4) join Perdita and Portia as the group's other seven members.

Similarities in orbits and photometric properties unite the Portia Group, as explained in "Comprehensive Photometry of the Rings and 16 Satellites of Uranus with the Hubble Space Telescope," published in the May 2001 issue of Icarus by the group's definer and namer, Erich Karkoschka. The study's photometric analyses considered 41 images taken in 1997 with the Hubble Space Telescope's (HST) Wide Field Planetary Camera 2 (WFPC2) and Near Infrared Camera and Multi-Object Spectrometer (NICMOS).

The Portia Group evinces short-term and long-term orbital instability and such potentially "chaotic behavior" as orbit crossings or collisions, as researched by American planetary astronomer Richard G. French, American astrophysicist Rebekah I. (Ilene) Dawson and American planetary astronomer Mark R. Showalter in "Resonances, Chaos, and Short-Term Interactions Among the Inner Uranian Satellites" and published in the April 2015 issue of The Astronomical Journal. The Portia Group also exhibits specific member pairings. The trio of Cupid, Belinda and Perdita exhibits "quite strong coupled behavior" (3.2 Orbital Variations in the Time Domain), with Belinda "sandwiched between" Perdita as the trio's outermost satellite and Cupid as the innermost satellite (3.4.2 Cupid, Belinda, and Perdita).

The Portia Group's nine members concentrate between the ε (epsilon) ring and the outermost μ (mu) ring. Their "tightly packed" orbits cover a radial span of 20,000 kilometers, as determined in "Resonances, Chaos, and Short-Term Interactions Among the Inner Uranian Satellites."

Perdita's name remembers the daughter of Leontes, King of Sicily, and Hermione, Queen of Sicily, in A Winter's Tale, a romantic, happily-ending play first published in 1623 by Elizabethan poet William Shakespeare (bapt. April 26, 1564-April 23, 1616). The satellite's name complies with the convention of naming the Uranian system's satellites after characters from Shakespearean plays or from "Rape of the Lock," a satirical narrative poem first published anonymously in May 1712 by Enlightenment era poet, satirist and translator Alexander Pope (May 21, 1688-May 30, 1744), according to "Planet and Satellite Names and Discoverers" on the International Astronomical Union's U.S. Geological Survey-managed Gazeteer of Planetary Nomenclature website.

The International Astronomical Union also has appended systemic Roman numeral designations I to XXVII to the names and provisional designations of 27 Uranian satellites. Perdita is designated Uranus XXV, abbreviated as UXXV.

Scott Sander Sheppard (born Feb. 19, 1977), an American astronomer with the Department of Terrestrial Magnetism at the Carnegie Institution for Science in Washington, DC, discovered the Uranian system's 28th satellite on Saturday, Nov. 4, 2023. The outer satellite, which has a diameter of 8 kilometers and an orbital period of 680 days, has received the temporary designation of S/2023 U1, according to "New moons of Uranus and Neptune announced," posted as Breaking News Feb. 23, 2024, on the Carnegie Institution of Science website.

Near-infrared (NIR) wide-field image obtained Monday, Sep. 4, 2023, by NASA's James Webb Space Telescope's NIRCam (Near-Infrared Camera) reveals Uranus’s seasonal north polar cap and dim inner and outer rings; annotations identify nine of the Uranian system's 13 inner satellites (top, clockwise: Perdita, Rosalind, Puck, Belinda, Desdemona, Cressida, Bianca, Portia, Juliet) and Titania (upper left center), Oberon (upper right center), Umbriel (center right), Miranda (lower center) and Ariel (lower center right) as the system's five major moons; image credits NASA, ESA, CSA, STScI: Public Domain, via Wikimedia Commons

Acknowledgment

My special thanks to talented artists and photographers/concerned organizations who make their fine images available on the internet.

Image credits:

"Discovery Image of Satellite 1986 U 10 of Uranus, Erich Karkoschka, University of Arizona, May 1999, Image Taken by Voyager 2 on January 23, 1986," image taken Thursday, Jan. 23, 1986, by Voyager 2 spacecraft's narrow-angle camera shows (first arrow; upper right edge) designation of Perdita as "1986 U 10," with arrow pointing to its location; image credit Voyager 2, NASA, Erich Karkoschka (U. Arizona): Public Domain, via Wikimedia Commons @ https://commons.wikimedia.org/wiki/File:Uranus'_Satellite_1986_U10_Discovery_Image.jpg; via Internet Archive Wayback Machine @ https://web.archive.org/web/20000815092629/http://science.opi.arizona.edu/pics/disc2.jpg

Baisas, Laura. "Astronomers discover new moons orbiting Uranus and Neptune. The tiny satellites were spotted circling our solar system’s most far flung planets." Popular Science > Science > Space > Solar System > Moons. Feb. 26, 2024.
Available via Popular Science @ https://www.popsci.com/science/uranus-neptune-new-moons/

Bolles, Dana; and SMD (Science Mission Directorate) Team, eds. "Juliet." Our Solar System > Planets > Uranus > Moons > Facts > Unique Aspects > Juliet.
Available via NASA Science @ https://science.nasa.gov/uranus/moons/juliet/

Bolles, Dana; and SMD (Science Mission Directorate) Team. "Voyager 2: First to visit all four giant planets." NASA Science > Mission > Voyager 2.
Available via NASA Science @ https://science.nasa.gov/mission/voyager/voyager-2/

Cady Coleman @Astro_Cady. "#OTD 1/3/1986: Using images the probe had taken, #Voyager2 scientist Steve Synnott discovered two of #Uranus's known moons: #Portia & #Juliet. https://theworld.org/stories/2017-01-01/why-moons-uranus-are-named-after-characters-shakespeare. New image: @NASAWebb @ESA_Webb @csa_asc #JWST #space #astronomy #planetaryscience." X (formerly Twitter). Jan. 3, 2024.
Available via X (formerly Twitter) @ https://twitter.com/Astro_Cady/status/1742597423199846693

Carnegie Science Earth & Planets Laboratory; and Scott S. Sheppard. "New moons of Uranus and Neptune announced." Carnegie News > The Latest News > Breaking News. Feb. 23, 2024.
Available via Carnegie Science @ https://carnegiescience.edu/new-moons-uranus-and-neptune-announced

Duncan, Martin J.; and Jack J. Lissauer. "Orbital Stability of the Uranian Satellite System." Icarus, vol. 125, issue 1 (January 1997): 1-12. DOI 10.1006/icar.1996.5568.
Available via Harvard ADSABS (NASA Astrophysics Data System Abstracts) @ https://ui.adsabs.harvard.edu/abs/1997Icar..125....1D/abstract
Available via ScienceDirect @ https://www.sciencedirect.com/science/article/abs/pii/S0019103596955682

Foust, Jeff. "Moon of Uranus is demoted." Spaceflight Now > News. Dec. 31, 2001.
Available via Spaceflight Now @ https://spaceflightnow.com/news/n0112/31uranusmoon/

French, Richard G.; Rebekah I. Dawson; and Mark R. Showalter. "Resonances, Chaos, and Short-Term Interactions Among the Inner Uranian Satellites." The Astronomical Journal, vol. 149, no. 4 (April 2015): 142 (28 pages).
Available via IOPscience @ https://iopscience.iop.org/article/10.1088/0004-6256/149/4/142
Available via IOPscience @ https://iopscience.iop.org/article/10.1088/0004-6256/149/4/142/pdf

French, Robert S.; and Mark R. (Robert) Showalter. "Cupid is doomed: An analysis of the stability of the inner uranian satellites." Icarus, vol. 220, issue 2 (August 2012): 911-921. DOI 10.1016/j.icarus.2012.06.031. DOI 10.48550/arXiv.1408.2543
Available via arXiv @ https://arxiv.org/abs/1408.2543
Available via arXiv @ https://arxiv.org/ftp/arxiv/papers/1408/1408.2543.pdf
Available via Harvard ADSABS (NASA Astrophysics Data System Abstracts) @ https://ui.adsabs.harvard.edu/abs/2012Icar..220..911F/abstract
Available via ScienceDirect @ https://www.sciencedirect.com/science/article/abs/pii/S0019103512002606

Green, Daniel W.E. "Brian Geoffrey Marsden (1937-2010)." The Observatory > Obituaries, vol. 131, no. 4 (April 2011): 108-109.
Available via Harvard ADSABS (NASA Astrophysics Data System Abstracts) @ https://adsabs.harvard.edu/full/2011Obs...131..108G
Available via Harvard ADSABS (NASA Astrophysics Data System Abstracts) @ https://adsabs.harvard.edu/pdf/2011Obs...131..108G

Green, Daniel W.E. "S/1986 U 10." Harvard University Central Bureau for Astronomical Telegrams CBAT. International Astronomical Union Circular (IAUC) No. 7171. May 18, 1999.
Available via CBAT @ http://www.cbat.eps.harvard.edu/iauc/07100/07171.html

Green, Daniel W.E. "Satellites of Uranus." Harvard University Central Bureau for Astronomical Telegrams CBAT. International Astronomical Union Circular (IAUC) No. 8194. Sep. 3, 2003.
Available via CBAT @ http://www.cbat.eps.harvard.edu/iauc/08100/08194.html

Greicius, Tony; and Naomi Hartono. "Uranus Moon -- 1985U1." NASA Jet Propulsion Laboratory > Images. June 21, 1999.
Available @ https://www.jpl.nasa.gov/images/pia01357-uranus-moon-1985u1

Hamilton, Calvin J. "Puck." Views of the Solar System > Image Index > Photos of Primary Targets > Uranus > Rosalind > Photo Archives: Puck > Puck File #: uranus/puck.
Available @ https://solarviews.com/cap/uranus/puck.htm

Hamilton, Calvin J. "Photo Archives Target: Puck." Views of the Solar System > Image Index > Photos of Primary Targets > Uranus > Puck > Photo Archives: Puck.
Available @ https://solarviews.com/cap/uranus/puck.htm

Hamilton, Calvin J. "Puck Uranus XV -- 1985U1." Views of the Solar System > Image Index > Photos of Primary Targets > Uranus > Puck > Photo Archives: Puck > Puck File #: uranus/puck > Related Document Puck.
Available @ https://solarviews.com/eng/puck.htm

International Astronomical Union (IAU) Working Group for Planetary System Nomenclature (WGPSN). "Body: Uranus XI (Juliet). Description: Heroine of Shakespeare's 'Romeo and Juliet. Date of Discovery: January 3, 1986. Discovery Location: Voyager 2. Discoverer: Voyager Science Team." IAU Gazetteer of Planetary Nomenclature > Nomenclature > Planet and Satellite Names and Discoverers.
Available @ https://planetarynames.wr.usgs.gov/Page/Planets

International Astronomical Union (IAU) Working Group for Planetary System Nomenclature (WGPSN). "Uranian System." IAU Gazetteer of Planetary Nomenclature > Nomenclature > Planet and Satellite Names and Discoverers.
Available @ https://planetarynames.wr.usgs.gov/Page/Planets

Jacobson, R.A. (Robert A.). "The Orbits of the Inner Uranian Satellites from Hubble Space Telescope and Voyager 2 Observations." 1998. The Astronomical Journal, vol. 115, no. 3 (March 1998): 1195-1199.
Available via IOPscience @ https://iopscience.iop.org/article/10.1086/300263
Available via IOPscience @ https://iopscience.iop.org/article/10.1086/300263

Jet Propulsion Laboratory. "PIA01278: Hubble Tracks Clouds on Uranus." NASA JPL Photojournal. Image addition date 1999-05-21.
Available @ https://photojournal.jpl.nasa.gov/catalog/PIA01278

The John J. McCarthy Observatory. "Astronomical and Historical Events: 3rd History: Stephen Synnott discovers Uranus’ moons Juliet and Portia (1986)." Galactic Observer, vol. 8, no. 1 (January 2015): 14.
Available @ https://www.mccarthyobservatory.org/newsletters/jjmo_news_01_15.pdf

Karkoschka, Erich. "Comprehensive Photometry of the Rings and 16 Satellites of Uranus with the Hubble Space Telescope." Icarus, vol. 151, issue 1 (May 2001): 51-68. DOI 10.1006/icar.2001.6596.
Available via Harvard ADSABS (NASA Astrophysics Data System Abstracts) @ https://ui.adsabs.harvard.edu/abs/2001Icar..151...51K/abstract
Available via ScienceDirect @ https://www.sciencedirect.com/science/article/abs/pii/S0019103501965960

Karkoschka, Erich. "Voyager's Eleventh Discovery of a Satellite of Uranus and Photometry and the First Size Measurements of Nine Satellites." Icarus, vol. 151, issue 1 (May 2001): 69-77. DOI 10.1006/icar.2001.6597.
Available via Harvard ADSABS (NASA Astrophysics Data System Abstracts) @ https://ui.adsabs.harvard.edu/abs/2001Icar..151...69K/abstract
Available via ScienceDirect @ https://www.sciencedirect.com/science/article/abs/pii/S0019103501965972

Karkoschka, Erich (University of Arizona); and NASA. "Hubble Watches Uranus." NASA Hubblesite > News > News Releases. Release ID 1997-36. Release date Nov. 20, 1997 12:00AM (EST).
Available via NASA Hubblesite @ https://hubblesite.org/contents/news-releases/1997/news-1997-36.html
Available via Harvard ADSABS (NASA Astrophysics Data System Abstracts) @ https://www.sciencedirect.com/science/article/abs/pii/S0019103501965972?via%3Dihub

Karkoschka, Erich (University of Arizona); and NASA. "Uranus, July 28,1997 (Annotated)." NASA Hubblesite > Media > Images. Release ID 1997-36. Release date Nov. 20, 1997 12:00AM (EST)
Available via NASA Hubblesite @ https://hubblesite.org/contents/media/images/1997/36/560-Image.html

Marriner, Derdriu. "Caliban and Sycorax Orbit With Respectively Low and High Eccentricity." Earth and Space News. Wednesday, July 20, 2011.
Available @ https://earth-and-space-news.blogspot.com/2011/07/caliban-and-sycorax-orbit-with.html

Marriner, Derdriu. "Gertrude Is Largest Known Crater on Largest Uranian Moon Titania." Earth and Space News. Wednesday, Jan. 19, 2011.
Available @ https://earth-and-space-news.blogspot.com/2011/01/gertrude-is-largest-known-crater-on.html

Marriner, Derdriu. "Hamlet Is Largest Known Crater on Second Largest Uranian Moon Oberon." Earth and Space News. Wednesday, Jan. 26, 2011.
Available @ https://earth-and-space-news.blogspot.com/2011/01/hamlet-is-largest-known-crater-on.html

Marriner, Derdriu. "Margaret Was Discovered Aug. 29, 2003, as Ninth Uranian Irregular Moon." Earth and Space News. Wednesday, August 17, 2011.
Available @ https://earth-and-space-news.blogspot.com/2011/08/margaret-was-discovered-aug-29-2003-as.html

Marriner, Derdriu. "Nine Uranian Irregular Moons Were Discovered Between 1997 and 2003." Earth and Space News. Wednesday, July 6, 2011.
Available @ https://earth-and-space-news.blogspot.com/2011/07/nine-uranian-irregular-moons-were.html

Marriner, Derdriu. "Prospero, Setebos and Stephano Were Recovered May, June and August 2000." Earth and Space News. Wednesday, Aug. 3, 2011.
Available @ https://earth-and-space-news.blogspot.com/2011/08/prospero-setebos-and-stephano-were.html

Marriner, Derdriu. "Stuart Eves Credits William Herschel With Uranian Epsilon Ring in 1789." Earth and Space News. Wednesday, Feb. 16, 2011.
Available @ https://earth-and-space-news.blogspot.com/2011/02/stuart-eves-credits-william-herschel.html

Marriner, Derdriu. "Trinculo, Ferdinand and Francisco Were Discovered Aug. 13, 2001." Earth and Space News. Wednesday, Aug. 10, 2011.
Available @ https://earth-and-space-news.blogspot.com/2011/08/trinculo-ferdinand-and-francisco-were.html

Marriner, Derdriu. "Uranian Irregular Moons Caliban and Sycorax Were Discovered Sept. 6, 1997." Earth and Space News. Wednesday, July 13, 2011.
Available @ https://earth-and-space-news.blogspot.com/2011/07/uranian-irregular-moons-caliban-and.html

Marriner, Derdriu. "Uranian Moon Belinda Was Discovered in Voyager 2 Images Jan. 13, 1986." Earth and Space News. Wednesday, July 24, 2024.
Available @ https://earth-and-space-news.blogspot.com/2024/07/uranian-moon-belinda-was-discovered-in.html

Marriner, Derdriu. "Uranian Moon Bianca Was Discovered Jan. 23, 1986, in Voyager 2 Images." Earth and Space News. Wednesday, Aug. 21, 2024.
Available @ https://earth-and-space-news.blogspot.com/2024/08/uranian-moon-bianca-was-discovered-jan.html

Marriner, Derdriu. "Uranian Moon Cordelia Was Discovered in Voyager 2 Images Jan. 20, 1986." Earth and Space News. Wednesday, Aug. 7, 2024.
Available @ https://earth-and-space-news.blogspot.com/2024/02/uranian-moon-cordelia-was-discovered-in.html

Marriner, Derdriu. "Uranian Moon Cressida Was Discovered Jan. 9, 1986, in Voyager 2 Images." Earth and Space News. Wednesday, July 10, 2024.
Available @ https://earth-and-space-news.blogspot.com/2024/07/uranian-moon-cressida-was-discovered.html

Marriner, Derdriu. "Uranian Moon Desdemona Was Discovered in Voyager 2 Images Jan. 13, 1986." Earth and Space News. Wednesday, July 31, 2024.
Available @ https://earth-and-space-news.blogspot.com/2024/07/uranian-moon-desdemona-was-discovered.html

Marriner, Derdriu. "Uranian Moon Juliet Was Discovered Jan. 3, 1986, in Voyager 2 Images." Earth and Space News. Wednesday, July 3, 2024.
Available @ https://earth-and-space-news.blogspot.com/2024/07/uranian-moon-juliet-was-discovered-jan.html

Marriner, Derdriu. "Uranian Moon Ophelia Was Discovered Jan. 20, 1986, in Voyager 2 Images." Earth and Space News. Wednesday, Aug. 14, 2024.
Available @ https://earth-and-space-news.blogspot.com/2024/08/uranian-moon-ophelia-was-discovered-jan.html

Marriner, Derdriu. "Uranian Moon Portia Was Discovered Jan. 3, 1986, in Voyager 2 Images." Earth and Space News. Wednesday, June 26, 2024.
Available @ https://earth-and-space-news.blogspot.com/2024/06/uranian-moon-portia-was-discovered-jan.html

Marriner, Derdriu. "Uranian Moon Puck Was Discovered Dec. 30, 1985, in Voyager 2 Images." Earth and Space News. Wednesday, June 12, 2024.
Available @ https://earth-and-space-news.blogspot.com/2024/06/uranian-moon-puck-was-discovered-dec-30.html

Marriner, Derdriu. "Uranian Moon Rosalind Was Discovered in Voyager 2 Images Jan. 13, 1986." Earth and Space News. Wednesday, July 17, 2024.
Available @ https://earth-and-space-news.blogspot.com/2024/07/uranian-moon-rosalind-was-discovered-in.html

Marriner, Derdriu. "Uranian Moons Prospero, Setebos and Stephano Were Discovered July 1999." Earth and Space News. Wednesday, July 27, 2011.
Available @ https://earth-and-space-news.blogspot.com/2011/07/uranian-moons-prospero-setebos-and.html

Marriner, Derdriu. "Uranus the Blue Green Ice Giant: Sideways Seventh Planet From the Sun." Earth and Space News. Friday, March 13, 2015.
Available @ https://earth-and-space-news.blogspot.com/2015/03/uranus-blue-green-ice-giant-sideways.html

Marriner, Derdriu. "Uranus Discovery 234 Years Ago on March 13, 1781, by Sir William Herschel." Earth and Space News. Friday, March 13, 2015.
Available @ https://earth-and-space-news.blogspot.com/2015/03/uranus-discovery-234-years-ago-on-march.html

Marriner, Derdriu. "Voyager 2 Images December 1985 to January 1986 Revealed 11 New Moons." Earth and Space News. Wednesday, June 5, 2024.
Available @ https://earth-and-space-news.blogspot.com/2024/06/voyager-2-images-december-1985-to.html

Marriner, Derdriu. "William Herschel Discovered First Two Uranian Moons on Jan. 11, 1787." Earth and Space News. Wednesday, Jan. 12, 2011.
https://earth-and-space-news.blogspot.com/2011/01/william-herschel-discovered-first-two.html

Marriner, Derdriu. "William Herschel First Glimpsed Uranian Ring System on March 4, 1787." Earth and Space News. Wednesday, Feb. 2, 2011.
https://earth-and-space-news.blogspot.com/2011/02/william-herschel-first-glimpsed-uranian.html

Marriner, Derdriu. "William Herschel Observed Flattened Polar Regions on Uranian Disk." Earth and Space News. Wednesday, Feb. 23, 2011.
https://earth-and-space-news.blogspot.com/2011/02/william-herschel-observed-flattened.html

Marriner, Derdriu. "William Herschel Saw Uranian Rings But Puzzling Views Created Doubt." Earth and Space News. Wednesday, Feb. 9, 2011.
https://earth-and-space-news.blogspot.com/2011/02/william-herschel-saw-uranian-rings-but.html

Marsden, Brian G., ed. "Satellites and Rings of Uranus." Harvard University Central Bureau for Astronomical Telegrams CBAT. International Astronomical Union Circular (IAUC) No. 4168. Jan. 27, 1986.
Available via CBAT @ http://www.cbat.eps.harvard.edu/iauc/04100/04168.html#item1

Marsden, Brian G., ed. "Satellites of Uranus." Harvard University Central Bureau for Astronomical Telegrams CBAT. International Astronomical Union Circular (IAUC) No. 4164. Jan. 16, 1986.
Available via CBAT @ http://www.cbat.eps.harvard.edu/iauc/04100/04164.html#Item1

Marsden, Brian G., ed. "Satellites of Uranus: Corrigendum." Harvard University Central Bureau for Astronomical Telegrams CBAT. International Astronomical Union Circular (IAUC) No. 4165. Jan. 17, 1986.
Available via CBAT @ http://www.cbat.eps.harvard.edu/iauc/04100/04165.html#Item6

Melton, Melanie. "Uranus 'Loses' a Moon: The 'New' Official Moon Count of the Solar System." NASA Solar System Exploration (SSE) > News. Dec. 20, 2001.
Available via NASA SSE @ https://solarsystem.nasa.gov/news/238//uranus-loses-a-moon-the-new-official-moon-count-of-the-solar-system/

Munsell, Kirk, acting ed. "Uranus: Moons: Rosalind." NASA Solar System Exploration (SSE) > Planets > Uranus > Moons > 8. Rosalind.
Available via Internet Archive Wayback Machine @ https://web.archive.org/web/20070801203825/http://solarsystem.nasa.gov/planets/profile.cfm?Object=Ura_Rosalind

NASA Hubblesite. "Features in the Uranus System." NASA Hubblesite > Images > Hubble Heritage.
Available via NASA Hubblesite @ https://hubblesite.org/contents/media/images/2005/33/1798-Image.html

NASA Hubblesite. "Newly Discovered Moons and Rings of Uranus (Annotated)." NASA Hubblesite > Image > Hubble Heritage.
Available via NASA Hubblesite @ https://hubblesite.org/contents/media/images/2005/33/1801-Image.html

NASA Jet Propulsion Laboratory; and Naomi Hartono, page ed. "Voyager Mission Celebrates 30 Years Since Uranus." NASA > Solar System. Jan. 22, 2016.
Available @ https://www.nasa.gov/solar-system/voyager-mission-celebrates-30-years-since-uranus/

NASA Jet Propulsion Laboratory Solar System Dynamics. "Planetary Satellite Discovery Circumstances." NASA JPL SSD (NASA Jet Propulsion Laboratory Solar System Dynamics) > Planetary Satellites. These data were last updated 2023-May-23.
Available via NASA Jet Propulsion Laboratory Solar System Dynamics (SSD) @ https://ssd.jpl.nasa.gov/sats/discovery.html

Overbye, Dennis. "Bradford Smith, Who Showed Postcards From Outer Space, Dies at 86." The New York Times > Obituaries. July 11, 2018.
Available @ https://www.nytimes.com/2018/07/11/obituaries/bradford-smith-86-dies-showed-postcards-from-outer-space.html

Owen, W.M. (William Mann), Jr.; and S.P. (Stephen P.) Synnott. "Orbits of the Ten Small Satellites of Uranus." The Astronomical Journal, vol. 93 (May 1987): 1268-1271. DOI 10.1086/114409.
Available via Harvard ADSABS (NASA Astrophysics Data System Abstracts) @ https://ui.adsabs.harvard.edu/abs/1987AJ.....93.1268O/abstract
Available via Harvard ADSABS (NASA Astrophysics Data System Abstracts) https://articles.adsabs.harvard.edu/full/1987AJ.....93.1268O
Available via Harvard ADSABS (NASA Astrophysics Data System Abstracts) @ https://articles.adsabs.harvard.edu/pdf/1987AJ.....93.1268O

Paradis, Samuel; Chris Moeckel; and Imke de Pater. "Near-IR photometry of the small Uranian satellites with Keck at phase angles 0–2°." Icarus, vol. 391 (February 2023): Article 115331.
Available via ScienceDirect @ https://www.sciencedirect.com/science/article/pii/S0019103522004237

Plotner, Tammy. What's Up 2007: 365 Days of Skywatching by Tammy Plotner. Universe Today, Nov. 29, 2006.
Available @ https://fatduck.org/nonhtml/365days2007.pdf
Available via Lulu Press @ https://www.lulu.com/shop/tammy-plotner/whats-up-2007-365-days-of-skywatching/paperback/product-584371.html

Pultarova, Tereza. "Scientists create most detailed map of Uranus' mysterious auroras to date." Space > The Universe > Solar System > Uranus. Last updated Oct. 19, 2021.
Available @ https://www.space.com/uranus-observation-infrared-aurora-map

Sabia, Steven. "NASA’s Webb Rings in Holidays With Ringed Planet Uranus." NASA > Missions > James Webb Space Telescope. Dec. 18, 2023. Last updated Jan 09, 2024.
Available @ https://www.nasa.gov/missions/webb/nasas-webb-rings-in-holidays-with-ringed-planet-uranus/

Sfair, R. (Rafael); and S.M. (Silvia Maria) Giuliatti Winter. "Orbital evolution of the μ and ν dust ring particles of Uranus." Astronomy and Astrophysics, vol. 505, issue 2 (October 2009: 845-852. DOI 10.1051/0004-6361/200911886.
Available via Astronomy & Astrophysics (A&A) @ https://www.aanda.org/component/article?access=bibcode&bibcode=&bibcode=2009A%2526A...505..845SFUL
Available via Astronomy & Astrophysics (A&A) @ https://www.aanda.org/articles/aa/pdf/2009/38/aa11886-09.pdf
Available via Harvard ADSABS (NASA Astrophysics Data System Abstracts) @ https://ui.adsabs.harvard.edu/abs/2009A%26A...505..845S/abstract
Available via Harvard ADSABS (NASA Astrophysics Data System Abstracts) @ https://www.aanda.org/articles/aa/pdf/2009/38/aa11886-09.pdf

Showalter, Mark R.; and Jack J. Lissauer. "The Second Ring-Moon System of Uranus: Discovery and Dynamics." Science, vol. 311, issue 5763 (Feb. 17, 2006): 973-977. DOI 10.1126/science.1122882.
Available @ https://www.science.org/doi/10.1126/science.1122882

Smith, B. A.; G.A. Briggs; G.E. Danielson; A.F. Cook; M.E. Davies; G.E. Hunt; H. Masursky; L.A. Soderblom; T.C. Owen; C. Sagan; and V.E. Suomi. "Voyager Imaging Experiment." Space Science Reviews, vol 21, issue 2 (November 1977): 103-127. DOI 10.1007/BF00200847.
Available via Harvard ADSABS (NASA Astrophysics Data System Abstracts) @ https://ui.adsabs.harvard.edu/abs/1977SSRv...21..103S/abstract
Available via Harvard ADSABS (NASA Astrophysics Data System Abstracts) @ https://articles.adsabs.harvard.edu/full/1977SSRv...21..103S
Available via Harvard ADSABS (NASA Astrophysics Data System Abstracts) @ https://articles.adsabs.harvard.edu/pdf/1977SSRv...21..103S

Smith, B.A.; L.A. Soderblom; R. Beebe; D. Bliss; J.M. Boyce; A. Brahic; G.A. Briggs; R.H. Brown; S.A. Collins; A.F. Cook II; S.K. Croft; J.N. Cuzzi; G.E. Danielson; M.E. Davies; T.E. Dowling; D. Godfrey; C.J. Hansen; C. Harris; G.E. Hunt; A.P. Ingersoll; T.V. Johnson; R.J. Krauss; H. Masursky; D. Morrison; T. Owen; J.B. Plescia; J.B. Pollack; C.C. Porco; K. Rages; C. Sagan; E.M. Shoemaker; L.A. Sromovsky; C. Stoker; R.G. Strom; V.E. Suomi; S.P. Synnott; R.J. Terrile; P. Thomas; W.R. Thompson; and J. Veverka. (4 July 1986). "Voyager 2 in the Uranian System: Imaging Science Results". Science, vol. 233, issue 4759 (July 4, 1986): 43–64. DOI 10.1126/science.233.4759.43.
Available via Harvard ADSABS (NASA Astrophysics Data System Abstracts) @ https://ui.adsabs.harvard.edu/abs/1986Sci...233...43S/abstract
Available via Zenodo @ https://zenodo.org/records/1230972

Uri, John. "35 Years Ago: Voyager 2 Explores Uranus." NASA > History. Jan. 22, 2021.
Available @ https://www.nasa.gov/history/35-years-ago-voyager-2-explores-uranus/

Weishaupt, Jeff. "How Many Moons Does Uranus Have? (Facts, & FAQ)." Optics Mag > Blog. Last updated July 15, 2023.
Available @ https://opticsmag.com/how-many-moons-does-uranus-have/

Wilford, John Noble. "Evidence of Magnetic Field Is Found." The New York Times > Special to The New York Times. Jan. 24, 1986.
Available @ https://www.nytimes.com/1986/01/24/us/evidence-of-magnetic-field-is-found.html

Williams, David "Dave" R. "Puck (UXV, S/1985 U1)." NSSDCA (NASA Space Science Data Coordinated Archive) Uranian Satellite Fact Sheet > Bulk Parameters > Lesser Satellites. Last updated Feb. 21, 2019.
Available via NASA GSFC (Goddard Space Flight Center) NSSDCA (NASA Space Science Data Coordinated Archive) @ https://nssdc.gsfc.nasa.gov/planetary/factsheet/uraniansatfact.html

Williams, David "Dave" R. "Uranus Rings Fact Sheet." NSSDCA (NASA Space Science Data Coordinated Archive) > Solar System Exploration > Uranus > Uranian Rings Fact Sheet. Last updated Oct. 14, 2015.
Available via NASA GSFC (Goddard Space Flight Center) NSSDCA (NASA Space Science Data Coordinated Archive) @ https://nssdc.gsfc.nasa.gov/planetary/factsheet/uranringfact.html

Williams, David "Dave" R.; and Jay Friedlander. "Puck -- Voyager 2." NASA Space Science Data Coordinated Archive (NSSDC) > Catalog of Spaceborne Imaging.
Available via NSSDC @ https://nssdc.gsfc.nasa.gov/imgcat/html/object_page/vg2_2683716.html

Zendexor. "Uranus." Solar System Heritage > Our Solar System > Uranus and Its Moons.
Available @ https://www.solarsystemheritage.com/uranus.html

Monday, August 26, 2024

Backbone and Chief’s Fishline Awe ‘Imiloa August 2024 Sky Watch

Summary: Backbone and Chief’s Fishline, as respective Kaiwikuamoo and Manaiakalani navigational star families and star lines, awe ‘Imiloa August 2024 Sky Watch.

"God talks to human beings through many vectors: through each other, through organized religion, through the great books of those religions, through wise people, through art and music and literature and poetry, but nowhere with such detail and grace and color and joy as through creation. When we destroy a species, when we destroy a special place, we're diminishing our capacity to sense the divine, understand who God is and what our own potential is." Robert Francis Kennedy Jr., April 19, 2023, Boston Park Plaza Hotel, Back Bay, Boston, Massachusetts.

“And there’s many people out there who want us to move to the next planet already and I’m like, hang on, let’s not give up on this planet yet," William, Prince of Wales, July 31, 2023, Sorted Food food truck, London, England, United Kingdom.

Star maps abound with such ancient Hawaiian cultural aspects as the Kaiwikuamoo (from Hawaiian ka iwi kua mo’o, “the bone[y] back [of the] lizard”) star line. The afore-mentioned star line, as navigational star family, accommodates akau (‘ākau, north, “right [of west-ensconced sun]”) to koolau (north, from Hawaiian ko’olau, “windward”) horizons by the mythological backbone of the lizard. It accounts for Kaiwi-kuamo’o Kekua-o-kalani as the alternate appellation of Keaoua Kekua-o-kalani (died Dec. 1819), nephew of King Kamehameha I (1736?-May 8?/14?, 1819) and rebel against the afore-mentioned uncle’s son, Kamehameha II (Nov. 1797-Jul 14, 1824). Perhaps he added that alternate appellation that addresses Mo’o, who, as mythological Hawaiian archipelago (group of islands, from Greek ἀρχι- πέλαγος, "main sea") protectors and water spirits, adore mischievous actions that not always agree with moon goddess Hina (from Hawaiian hina, “prostrate”). Hina aligns with the other evening- and night-sky navigational star family, Manaiakalani (Mānaiakalani, from Hawaiian māna ia ka lani, “hook fish the chief[Māui‘s]”); Sunday, May 3, 2009, 17:27, image of Keaoua Kekua-o-kalani's gravesite, listed on National Register of Historic Places in the United States of America as reference number 74000714: W Nowicki, CC BY 3.0 Unported, via Wikimedia Commons

Backbone and Chief’s Fishline, respectively as the Kaiwikuamoo and the Manaiakalani star lines among four navigational star families associated, one per quadrant, with the celestrial sphere, awe ‘Imiloa August 2024 Sky Watch.

Kaiwikuamoo and Manaiakalani (from Hawaiian ka iwi kua mo’o, “the bone[y] back [the] lizard[‘s]”; māna ia ka lani, “hook fish the chief[‘s]”) lines beautify sunless skies. Hawaii-state skies over University of Hawaii, Hilo, Hawaii County and island (from Hawaiian hilo, “thread”; ha wai ‘i, “breath life-force supreme”) configure them 8:00 p.m. onward. Eight p.m. Hawaii-Aleutian Time (HAST) denotes 4:00 Chamorro, 7:00 Samoa, 10:00 Alaska, 11:00 Pacific, midnight next-day Mountain, 1:00 a.m. Central, 2:00 Eastern, 3:00 Atlantic Time onward.

The Backbone Kaiwikuamoo, exiting akau’s (‘ākau, north, “right [of west-ensconced sun]”) Hokupaa (North Star, from Hawaiian hōkū pa’a, “star immovable”), enters ho’olua (northwest, “[rain-bearing strong] wind”).

Nahiku (Big Dipper, from Hawaiian Nā Hiku ka Huihui a Makali’i, “the seven of cluster of eyes/stars little [= Pleiades]”) faces northwestwardly the hoolua, northwest horizon.

Hokuleʻa (Arcturus, from Hawaiian Hōkūleʻa, “star clear/happy”) gazes westward to the komohana (west, “[where sun] enters [sea]”) horizon, where nothing celestially gleams, glistens, glitters or glows. Hema (south, “left [of west-ensconced sun]”), malanai (southeast, “gentle breeze”), hikina (“east”), koolau (north, from Hawaiian ko’olau, “windward”), akau horizons hold night-sky I’a (Milky Way, “fish”). Hikianalia (Spica, from Hawaiian hiki, “star") and Me’e (Corvus [from Latin corvus, “crow, raven"]; Marquesan me’e, “voice of joy”; Hawaiian me’e, “admired/hero/heroic/heroine/prominent”) illuminate the komohana horizon.

Akau, hoolua, komohana, kona, hema and akau, koolau, hikina, malanai, hema horizons respectively jubilate Backbone and Chief’s Fishline star lines during ‘Imiloa August 2024 Sky Watch.

The hema horizon knows the I’a galaxy as the southernmost kindling that August evening and night skies keepsake even as the akau horizon keeps one constellation.

I’a galaxy launches banded, faint, pale, white light even as the constellation Iwakelii (Cassiopeia, from Hawaiian ‘iwa ali’i, “frigatebird [Fregata minor] chief”), letters M- or W-like. The malanai horizon musters, as southern manifestation of Chief’s Fishline Manaiakalani Kamakaunuiamaui (Scorpius, from Hawaiian ka makau nui a māui, “the fishhook big of [demi-god] Māui”). Pimoe (Sagittarius, from Hawaiian pī moe, “sparse sleep”) nestles into niches northerly to Maui’s (from Hawaiian māui, “bruise, sprain”) big fishhook, southerly to the Navigator’s Triangle.

‘Imiloa August 2024 Sky Watch offers night-sky observers the Backbone Kaiwikuamoo and the Chief’s Fishline Manaiakalani star lines obtaining ordinary occupancies organized over north-south, south-north orientations.

Humu, Keoe and Piraetea (Altair, Vega, Deneb, from Hawaiian humu, “fishhook-hole”; keoe, “sweet potato”; pira'etea, “white sea-swallow”) perch within the asterism presented as The Navigator’s Triangle.

Aquila bright-star Humu, Lyra bright-star Keoe, Cygnus bright-star Piraetea respectively queue ka huinakolu a ka ho’okele (“the triangle of the navigator”) along hikina, hikina-koolau, koolau horizons. The constellations recognized as Aquila, Lyra and Cygnus (from Latin aquila, “eagle”; Greek λῠ́ρᾱ, “lyre”; Greek κύκνος, “swan”) respectively regale hikina, hikina and koolau, koolau horizons. Hazy, milk-white, streaming I’a, perhaps 30 degrees in its strongest width, stretches from between north-northeast horizons; through east, southeast, south horizons; to between south-southwesterly leeward horizons.

‘Imiloa August 2024 Sky Watch nightly teams the Backbone Kaiwikuamoo and the Chief’s Fishline Manaiakalani navigational star families with the constellation Iwakelii and the galaxy I’a.

Manaiakalani (from Hawaiian māna ia ka lani, “hook fish the chief[‘s]”) star line, as navigational star family, allowed ancient Hawaiians, as it allows modern Hawaiians, to ally northwest to southwest, Hoolua, Komohana and Kona (from Hawaiian ho’olua, “northwest, “[rain-bearing strong] wind”]”; komo, “west, “[where sun] enters [sea]”; kona, “leeward”) horizons. That magic fish hook of Chief Maui (Māui, from Hawaiian māui, “bruise, sprain”) sometimes anchored a baited wing of the alae (gallinule, moorhen, mudhen, red coot, from Hawaiian ‘alae [Gallinula galeata sandvicensis]”) bird so appreciated by moon goddess Hina (from Hawaiian hina, “prostrate”); Gallinula sandvicensis, illustrated and lithographed by English zoological artist and lepidopterist Frederick William Frohawk (July 16, 1861-Dec. 10, 1946) in Scott B. Wilson and A.H. Evans, Aves Hawaiiensis: The Birds of the Sandwich Islands (1890-1899), Plate 57: Biodiversity Heritage Library (BioDivLibrary), Public Domain, via Flickr

Acknowledgment

My special thanks to talented artists and photographers/concerned organizations who make their fine images available on the internet.

Image credits:

Bernice Pauahi Bishop Museum @BishopMuseum. 31 May 2013. "Aloha Friday Fact! The term 'Lahaina Noon' is relatively new, actually invented in 1990 for a phenomenon long marked by cultures across the Pacific and the tropics more widely. . . ." Facebook.
Available @ https://www.facebook.com/BishopMuseum/photos/a.167268692109/10151654494977110/

Campbell, Kimo. (Ed.). 1997. The Kumulipo: An Hawaiian Creation Myth. Second printing. Honolulu HI: Pueo Press. First Pueo Press edition. San Francisco CA: Pueo Press, 1978. First published by Boston MA: Lee and Shepard, 1897.
Available @ http://www.soest.hawaii.edu/GG/FACULTY/ROWLAND/GG104/Readings/Liliuokalani_1897.pdf

"Hawaiian Lunar Month." Hokulea > 'Ike: Knowledge and Traditions > Wayfinding: Modern Methods and Techniques of Non-Instrument Navigation, Based on Pacific Traditions > Hawaiian Voyaging Traditions > Hawaiian Lunar Month.
Available @ https://archive.hokulea.com/ike/hookele/hawaiian_lunar_month.html

Joey; and Gerrit. "Average Weather For Hilo (By Month)." Love Big Island > Menu > Regions > Hilo > Highlights > Highlights For Hilo (City And Outdoors) > Guide to Hilo: Beaches, Favorites Activities, And Day Trips > Table of contents > Weather trends > Local Weather in Hilo > monthly average weather for Hilo. Updated 16 March 2021. Copyright 2011-2023.
Available @ https://www.lovebigisland.com/hilo/average-yearly-weather/

"July 2024 Sky Watch." 'Imiloa > Education & Outreach > Sky Lines & Sky Watch.
Available @ https://imiloahawaii.org/sky-charts

"June 2024 Sky Watch." 'Imiloa > Education & Outreach > Sky Lines & Sky Watch.
Available @ https://imiloahawaii.org/sky-charts

Kawaharada, Dennis. “Lunar Days.” Kapi’olani Community College > Asia-Pacific Digital Library > APDL > Traditions of O’ahu. Copyright Kapi’olani Community College 2001-2004. Last Modified Last Updated 27 February 2023.
Available @ https://guides.library.kapiolani.hawaii.edu/apdl/oahu/days#:~:text=Kukahi%20(first%20Ku)%3A%20moon,to%20the%20shore%20to%20fish.

Kawaharada, Dennis. “Traditions of O'ahu: Seasons & Months.” Kapi’olani Community College > Asia-Pacific Digital Library > APDL > Traditions of O’ahu. Copyright Kapi’olani Community College 2001-2004. Last Modified Last Updated 27 February 2023.
Available @ https://guides.library.kapiolani.hawaii.edu/apdl/oahu/months

"Lāhaina Noon." Bernice Pauahi Bishop Museum > Astronomy Resources.
Available @ https://www.bishopmuseum.org/planetarium/astronomy-resources/lahaina-noon/

Marriner, Derdriu. 26 August 2024. "Backbone and Chief's Fishline Awe 'Imiloa August 2024 Sky Watch." Earth and Space News. Monday.
Available @ https://earth-and-space-news.blogspot.com/2024/08/backbone-and-chiefs-fishline-awe-imiloa.html

Marriner, Derdriu. 19 August 2024. "Mars and Jupiter Conjunction Alights ‘Imiloa August 2024 Sky Watch." Earth and Space News. Monday.
Available @ https://earth-and-space-news.blogspot.com/2024/08/mars-and-jupiter-conjunction-alights.html#google_vignette

Marriner, Derdriu. 12 August 2024. "Perseids Meteor Shower Maximally Alights ‘Imiloa August 2024 Sky Watch." Earth and Space News. Monday.
Available @ https://earth-and-space-news.blogspot.com/2024/08/perseids-meteor-shower-maximally.html

Marriner, Derdriu. 5 August 2024. "‘Imiloa August 2024 Sky Watch Accepts Two Last-Quarter Moon Phases." Earth and Space News. Monday.
Available @ https://earth-and-space-news.blogspot.com/2024/08/imiloa-august-2024-sky-watch-accepts.html

Marriner, Derdriu. 29 July 2024. "Moons, Planets, Stars Are at ‘Imiloa July 2024 Sky Watch Early Morning." Earth and Space News. Monday.
Available @ https://earth-and-space-news.blogspot.com/2024/07/moons-planets-stars-are-at-imiloa-july.html

Marriner, Derdriu. 22 July 2024. "The Backbone and The Chief’s Fishline Awe ‘Imiloa July 2024 Sky Watch." Earth and Space News. Monday.
Available @ https://earth-and-space-news.blogspot.com/2024/07/the-backbone-and-chiefs-fishline-awe.html#google_vignette

Marriner, Derdriu. 15 July 2024. "‘Imiloa July 2024 Sky Watch Assigns Lahaina Noon Dates, Places, Times." Earth and Space News. Monday.
Available @ https://earth-and-space-news.blogspot.com/2024/07/imiloa-july-2024-sky-watch-assigns.html

Marriner, Derdriu. 8 July 2024. "‘Imiloa July 2024 Sky Watch Accepts Two First-Quarter Moon Phases." Earth and Space News. Monday.
Available @ https://earth-and-space-news.blogspot.com/2024/07/imiloa-july-2024-sky-watch-accepts-two.html

Marriner, Derdriu. 1 July 2024. "‘Imiloa July 2024 Sky Watch Adds One More To Ancient Moon Phases." Earth and Space News. Monday.
Available @ https://earth-and-space-news.blogspot.com/2024/07/imiloa-july-2024-sky-watch-adds-one.html

Marriner, Derdriu. 24 June 2024. "'Imiloa June 2024 Sky Watch Morning Planets, Star Cluster, Star Lines." Earth and Space News. Monday.
Available @ https://earth-and-space-news.blogspot.com/2024/06/imiloa-june-2024-sky-watch-morning.html

Marriner, Derdriu. 17 June 2024. "‘Imiloa June 2024 Sky Watch Moon Phases Admit Summer Solstice June 20." Earth and Space News. Monday.
Available @ https://earth-and-space-news.blogspot.com/2024/06/imiloa-june-2024-sky-watch-moon-phases.html#google_vignette

Marriner, Derdriu. 10 June 2024. "‘Imiloa June 2024 Sky Watch Addresses Backbone Star Line Kaiwikuamo’o." Earth and Space News. Monday.
Available @ https://earth-and-space-news.blogspot.com/2024/06/imiloa-june-2024-sky-watch-addresses.html

Thompson, Nainoa. "Hawaiian Star Lines and Names for Stars." Hawaiian Voyaging Traditions > Home > Menu > 'Ike: Knowledge and Traditions > Ho'okele: On Wayfinding > Nainoa Thompson On Wayfinding > Wayfinding: Modern Methods and Techniques of Non-Instrument Navigation, Based on Pacific Traditions > Hawaiian Star Lines.
Available @ https://archive.hokulea.com/ike/hookele/hawaiian_star_lines.html

"Traditional month names, 1895." nupepa. Posted 11 November 2013. Powered by WordPress.
Available @ https://nupepa-hawaii.com/2013/11/21/traditional-month-names-1895/

"Weather in Hilo in July 2024." World Weather > World > United States > Hawaii > Weather in Hilo.
Available @ https://world-weather.info/forecast/usa/hilo/july-2024/

"Weather in Hilo in June 2024." World Weather > World > United States > Hawaii > Weather in Hilo.
Available @ https://world-weather.info/forecast/usa/hilo/june-2024/

Yuen, Leileihua. "Kaulana Mahina - The Hawaiian Lunar Calendar." Ka'ahele Hawaii Writing for and about Hawai'i since 1993 > Ka Moomeheu o Hawaii - The Culture of Hawaii > Ao Hōkū - Hawaiian Astronomy.
Available @ https://www.kaahelehawaii.com/kaulana-mahina-the-hawaiian-lunar-calendar/

Wednesday, August 21, 2024

Uranian Moon Bianca Was Discovered Jan. 23, 1986, in Voyager 2 Images

Summary: Uranian moon Bianca was discovered in images taken Thursday, Jan. 23, 1986, by Voyager 2 during the probe's flyby of the seventh planet from the sun.

Bianca, new Uranian satellite discovered Thursday, Jan. 23, 1986, in discovery image obtained by NASA's Voyager 2 robotic space probe: NASA, Public Domain, via Wikimedia Commons

Uranian moon Bianca was discovered in images acquired Thursday, Jan. 23, 1986, by Voyager 2 during the interstellar and planetary space probe's flyby of the seventh planet from the sun.

Bianca participates is the group of 11 satellites of Uranus that Voyager 2 imaged during the robotic interstellar spacecraft's flyby of the cyan-colored, planetary side-spinner, Uranus, from late autumn 1985 through winter 1986. The Voyager 2 probe's observational encounter with the Uranian system from Monday, Nov. 4, 1985, to Tuesday, Feb. 25, 1986, yielded more than 7,000 photographs for the National Aeronautics and Space Administration's (NASA) Voyager Science Imaging Team, according to John Uri, NASA Johnson Space Center's History Office manager, in "35 Years Ago: Voyager 2 Explores Uranus," posted Jan. 22, 2021, on the NASA website.

The discovery of the new Uranian satellite by way of Voyager images taken Thursday, Jan. 23, 1986, was revealed in International Astronomical Union Circular (IAUC) No. 4168, dated Jan. 27, 1986, by the publication's editor, British lost asteroid and comet tracker Brian G. (Geoffrey) Marsden (Aug. 5, 1937-Nov. 18, 2010). The discovery information was detailed y American planetary astronomer and Voyager mission lead imaging scientist B.A. (Bradford Adelbert) Smith (Sep. 22, 1931-July 3, 2018) on behalf of the Voyager Science Imaging Team. As the ninth Uranian satellite discovered in 1986, the yet-unnamed Bianca was designated provisionally as S/1986 U9, as stated in the circular from the IAU's Central Bureau for Astronomical Telegrams (CBAT). Bianca was profiled with a revolution period of 10.38 hours and an orbital semimajor axis, or, primary body-to-secondary (orbiting) body mean distance, of 59,100 kilometers; and a satellite radius of 50 kilometers.

The satellite radius was corrected to the satellite diameter of 50 kilometers, according to Marsden's "Corrigendum" in International Astronomical Union Circular (IAUC) No. 4165, dated Jan. 17, 1986. The satellite's estimated diameter subsequently was confirmed at 50 kilometers by recalculations occasioned by a newly measured albedo of approximately 0.05 for Puck (provisionally designated S/1985 U1; systemic Roman numeral designation Uranus XV, abbreviated UXV), according to IAUC No. 4168, dated Jan. 27, 1968.

The two-camera system carried by Voyager 2 features a wide-angle camera with a focal length (f) of 1500 millimeters (mm)and a narrow-angle camera with a focal length of 200 millimeters. As with all Uranian satellites imaged by Voyager 2, Bianca emerged in 15.36-second exposures obtained by the space probe's narrow-angle camera, according to W.M. Owen Jr. and S.P. Synnott in "Orbits of the Ten Small Satellites of Uranus" (page 1268), published in the May 1987 issue of The Astronomical Journal.

Bianca is considered an inner satellite. The Uranian system's 13 inner satellites orbit within the orbit of Miranda, the innermost and smallest of the system's five major moons. Bianca's orbit falls within the ε (epsilon) and ν (nu) rings, the respectively 11th and 12th outermost rings in the Uranian system.

Bianca participates in the Portia Group of Uranian satellites. The nine-member group is headed by and named after its largest member, Portia (S/1986 U1). The group's other seven members are Belinda (S/1986 U5), Cressida (S/1986 U3), Cupid (S/2003 U2), Desdemona (S/1986 U6), Juliet (S/1986 U2), Perdita (S/1986 U10) and Rosalind (S/1986 U 4). The group shares similar orbits and photometric properties, as explained in "Comprehensive Photometry of the Rings and 16 Satellites of Uranus with the Hubble Space Telescope," published in the May 2001 issue of Icarus by the group's definer and namer, Erich Karkoschka, planetary scientist at the University of Arizona's (Arizona; U of A; UArizona; UA) Lunar and Planetary Laboratory (LPL) in Tucson, Pima County, south central Arizona.

Bianca and Portia Group members Belinda, Cressida, Desdemona, Juliet and Rosalind present a "nearly neutral response" at the wavelength range of 1.5 to 2.0 μm in the infrared region of the electromagnetic spectrum. The findings source from a multiband photometric analysis of images of the inner Uranian system obtained by the Hubble Space Telescope's (HST) Wide Field Planetary Camera 2 (WFPC2) and Near Infrared Camera and Multi-Object Spectrometer (NICMOS), as shared by French observatory scientist Christophe Dumas, American planetary astronomer and Voyager mission lead imaging scientist Bradford A. Smith (Sep. 22, 1931-July 3, 2018) and American simulation hypothesis supporter and Voyager mission scientist Richard J. (John) Terrile (born March 22, 1951) in "Hubble Space Telescope NICMOS Multiband Photometry of Proteus and Puck" (page 1083), published in the August 2003 issue of The Astronomical Journal. The authors acknowledge Erich Karkoschka's previous formation of the Portia Group in 2001 on the basis of "similar photometric behavior."

Short-term and long-term orbital instability and the potential for such "chaotic behavior" as orbit crossings or collisions characterize the Portia Group, as determined by American planetary astronomer Richard G. French, American astrophysicist Rebekah I. (Ilene) Dawson and American planetary astronomer Mark R. Showalter in "Resonances, Chaos, and Short-Term Interactions Among the Inner Uranian Satellites" and published in the April 2015 issue of The Astronomical Journal. Portia Group member pairings occur. Interactions with nearest neighbor Cressida dominate Bianca's orbital variations. Cressida exhibits "coupled behavior" with both Bianca and Cressida's closest neighbor, Desdemona. Bianca, Cressida and Desdemona comprise an "interlocked trio" in which not only do Biance-sourced perturbations potentially effect orbital chaos in interactions between Cressida and Desdemona but also perturbations by Desdemona potentially and chaotically disrupt interactions between Bianca and Cressida, according to the team's research.

The Portia Group's nine members crowd between the ε (epsilon) ring and the outermost μ (mu) ring. Their "tightly packed" orbits cover a radial span of 20,000 kilometers, as determined in "Resonances, Chaos, and Short-Term Interactions Among the Inner Uranian Satellites."

Bianca namesakes the sister of Katherine, the lead female character in The Taming of the Shrew, a comic play first published in 1600 by Elizabethan poet William Shakespeare (bapt. April 26, 1564-April 23, 1616). The satellite's name exemplifies the convention of naming the Uranian system's satellites after characters from Shakespearean plays or from "Rape of the Lock," a satirical narrative poem first published anonymously in May 1712 by Enlightenment era poet, satirist and translator Alexander Pope (May 21, 1688-May 30, 1744), according to "Planet and Satellite Names and Discoverers" on the International Astronomical Union's U.S. Geological Survey-managed Gazeteer of Planetary Nomenclature website.

The International Astronomical Union additionally identified 27 Uranian satellites with systemic Roman numeral designations I to XXVII. Bianca is designated Uranus VIII, abbreviated as UVIII.

Acknowledgment

My special thanks to talented artists and photographers/concerned organizations who make their fine images available on the internet.

Image credits:

Bianca, new Uranian satellite discovered Thursday, Jan. 23, 1986, in discovery image obtained by NASA's Voyager 2 robotic space probe: NASA, Public Domain, via Wikimedia Commons @ https://commons.wikimedia.org/wiki/File:Inset-ura_bianca-large.gif

"Discovery Image of Satellite 1986 U 10 of Uranus, Erich Karkoschka, University of Arizona, May 1999, Image Taken by Voyager 2 on January 23, 1986," image taken Thursday, Jan. 23, 1986, by Voyager 2 spacecraft's narrow-angle camera shows (third arrow; left edge) designation of Bianca, with arrow pointing to its location; image credit Voyager 2, NASA, Erich Karkoschka (U. Arizona): Public Domain, via Wikimedia Commons @ https://commons.wikimedia.org/wiki/File:Uranus'_Satellite_1986_U10_Discovery_Image.jpg; via Internet Archive Wayback Machine @ https://web.archive.org/web/20000815092629/http://science.opi.arizona.edu/pics/disc2.jpg

Images were taken Monday, July 28, 1997, with second (right) obtained 90 minutes after the first, by NASA Hubble Space Telescope's Near Infrared Camera and Multi-Object Spectrometer (NICMOS); annotated image (right) identifies eight of the Uranian system's 13 inner satellites as (top, clockwise) Belinda, Puck (upper right), Portia, Bianca, Cressida, Juliet, Desdemona and Rosalind; image credit NASA/JPL/STScI; image Addition Date: 1999-05-21: May be used for any purpose without prior permission, via NASA JPL Photojournal @ https://photojournal.jpl.nasa.gov/catalog/PIA01278; credits Erich Karkoschka (University of Arizona) and NASA: Public Domain, via NASA Hubblesite @ https://hubblesite.org/contents/media/images/1997/36/560-Image.html; Permissions Content Use Policy (Public Domain), via NASA Hubblesite @ https://hubblesite.org/contents/news-releases/1997/news-1997-36.html

For further information:

Cartwright, Richard J.; Chloe B. Beddingfield; Tom A. Nordheim; Catherine M. Elder; Julie C. Castillo-Rogez; Marc Neveu; Ali M. Bramson; Michael M. Sori; Bonnie J. Buratti; Robert T. Pappalardo; Joseph E. Roser; Ian J. Cohen; Erin J. Leonard; Anton I. Ermakov; Mark R. Showalter; William M. Grundy; Elizabeth P. Turtle; and Mark D. Hofstadter."The Science Case for Spacecraft Exploration of the Uranian Satellites: Candidate Ocean Worlds in an Ice Giant System." The Planetary Science Journal, vol. 2, no. 3 (June 2021): 120. DOI 10.3847/PSJ/abfe12.
Available via IOPscience @ https://iopscience.iop.org/article/10.3847/PSJ/abfe12

Greicius, Tony; and Naomi Hartono. "Uranus Moon -- 1985U1." NASA Jet Propulsion Laboratory > Images. June 21, 1999.
Available @ https://www.jpl.nasa.gov/images/pia01357-uranus-moon-1985u1

Hamilton, Calvin J. "Rosalind." Views of the Solar System > Image Index > Photos of Primary Targets > Uranus > Rosalind > Photo Archives: Rosalind.
Available @ https://solarviews.com/cap/uranus/portia.htm

Hamilton, Calvin J. "Bianca." Views of the Solar System > Image Index > Photos of Primary Targets > Uranus > Bianca > Photo Archives: Bianca > Bianca File #: uranus/bianca.
Available @ https://solarviews.com/cap/uranus/bianca.htm

Hamilton, Calvin J. "Bianca Uranus VIII -- 1986U9." Views of the Solar System > Image Index > Photos of Primary Targets > Uranus > Bianca.
Available @ https://solarviews.com/eng/bianca.htm

Hamilton, Calvin J. "Photo Archives Target: Bianca." Views of the Solar System > Image Index > Photos of Primary Targets > Uranus > Bianca > Photo Archives: Bianca > Bianca File #: uranus/bianca.
Available @ https://solarviews.com/cap/index/bianca1.html

Jacobson, R.A. (Robert A.). "The Orbits of the Inner Uranian Satellites from Hubble Space Telescope and Voyager 2 Observations." 1998. The Astronomical Journal, vol. 115, no. 3 (March 1998): 1195-1199.
Available via Harvard ADSABS (NASA Astrophysics Data System Abstracts) @ https://ui.adsabs.harvard.edu/abs/1998AJ....115.1195J/abstract
Available via Harvard ADSABS (NASA Astrophysics Data System Abstracts) @ https://iopscience.iop.org/article/10.1086/300263/pdf
Available via IOPscience @ https://iopscience.iop.org/article/10.1086/300263
Available via IOPscience @ https://iopscience.iop.org/article/10.1086/300263/pdf

Jet Propulsion Laboratory. "PIA01278: Hubble Tracks Clouds on Uranus." NASA JPL Photojournal. Image addition date 1999-05-21.
Available @ https://photojournal.jpl.nasa.gov/catalog/PIA01278

Marriner, Derdriu. "Uranian Moon Belinda Was Discovered in Voyager 2 Images Jan. 13, 1986." Earth and Space News. Wednesday, July 24, 2024.
Available @

Marriner, Derdriu. "Uranian Moon Bianca Was Discovered Jan. 23, 1986, in Voyager 2 Images." Earth and Space News. Wednesday, Aug. 21, 2024.
Available @

Marriner, Derdriu. "Uranian Moon Cordelia Was Discovered in Voyager 2 Images Jan. 20, 1986." Earth and Space News. Wednesday, Aug. 7, 2024.
Available @

Marriner, Derdriu. "Uranian Moon Cressida Was Discovered Jan. 9, 1986, in Voyager 2 Images." Earth and Space News. Wednesday, July 10, 2024.
Available @

Marriner, Derdriu. "Uranian Moon Desdemona Was Discovered in Voyager 2 Images Jan. 13, 1986." Earth and Space News. Wednesday, July 31, 2024.
Available @

Marriner, Derdriu. "Uranian Moon Juliet Was Discovered Jan. 3, 1986, in Voyager 2 Images." Earth and Space News. Wednesday, July 3, 2024.
Available @

Marriner, Derdriu. "Uranian Moon Ophelia Was Discovered Jan. 20, 1986, in Voyager 2 Images." Earth and Space News. Wednesday, Aug. 14, 2024.
Available @

Marriner, Derdriu. "Uranian Moon Portia Was Discovered Jan. 3, 1986, in Voyager 2 Images." Earth and Space News. Wednesday, June 26, 2024.
Available @

Marriner, Derdriu. "Uranian Moon Puck Was Discovered Dec. 30, 1985, in Voyager 2 Images." Earth and Space News. Wednesday, June 12, 2024.
Available @

Marriner, Derdriu. "Uranian Moon Rosalind Was Discovered in Voyager 2 Images Jan. 13, 1986." Earth and Space News. Wednesday, July 17, 2024.
Available @

Marriner, Derdriu. "Voyager 2 Images December 1985 to January 1986 Revealed 11 New Moons." Earth and Space News. Wednesday, June 5, 2024.
Available @

Marsden, Brian G., ed. "Satellites of Uranus and Neptune." Harvard University Central Bureau for Astronomical Telegrams CBAT. International Astronomical Union Circular (IAUC) No. 4159. Jan. 9, 1986.
Available via CBAT @ http://www.cbat.eps.harvard.edu/iauc/04100/04159.html

NASA Hubblesite. "Features in the Uranus System." NASA Hubblesite > Images > Hubble Heritage.
Available via NASA Hubblesite @ https://hubblesite.org/contents/media/images/2005/33/1798-Image.html

Uri, John. "35 Years Ago: Voyager 2 Explores Uranus." NASA > History. Jan. 22, 2021.
Available @ https://www.nasa.gov/history/35-years-ago-voyager-2-explores-uranus/

Weishaupt, Jeff. "How Many Moons Does Uranus Have? (Facts, & FAQ)." Optics Mag > Blog. Last updated July 15, 2023.
Available @ https://opticsmag.com/how-many-moons-does-uranus-have/

Williams, David "Dave" R. "Bianca (UVIII, S/1986 U9)." NSSDCA (NASA Space Science Data Coordinated Archive) Uranian Satellite Fact Sheet > Bulk Parameters > Lesser Satellites. Last updated Feb. 21, 2019.
Available via NASA GSFC (Goddard Space Flight Center) NSSDCA (NASA Space Science Data Coordinated Archive) @ https://nssdc.gsfc.nasa.gov/planetary/factsheet/uraniansatfact.html

Zendexor. "Uranus." Solar System Heritage > Our Solar System > Uranus and Its Moons.
Available @ https://www.solarsystemheritage.com/uranus.html