Jingpo Lacus Glints During Cassini Orbiter’s Titan Flyby July 8, 2009

Summary: Jingpo Lacus glints during Cassini Orbiter’s Titan flyby July 8, 2009, according to Cassini’s Visible and Infrared Mapping Spectrometer (VIMS).

Cassini Orbiter’s Visible and Infrared Mapping Spectrometer’s (VIMS) July 8, 2009, image capture of sunlight reflected from the north polar region’s Jingpo Lacus confirms liquid presence in Titan’s northern hemisphere; NASA ID PIA12481; image added Dec. 17, 2009; image credit NASA/JPL/University of Arizona/DLR: May be used for any purpose without prior permission, via NASA JPL Photojournal

Jingpo Lacus glints during Cassini Orbiter’s Titan flyby July 8, 2009, according to an image obtained by the spacecraft’s Visible and Infrared Mapping Spectrometer (VIMS).

The glint typifies a specular reflection, which is a reflection that has the properties of a mirror. A specular reflection occurs as a mirror-like reflection of waves, all at the same angle, from a smooth surface.

Cassini scientists identified the glinting location on Titan by examining radar and near-infrared light images obtained from 2006 to 2008. The glint seemed to originate near the western shores of Kraken Mare, the largest know liquid body on Titan. The scientists tracked the glint’s location to a part of Jingpo Lacus near 71 degrees north latitude, 337 degrees west longitude.

Jingpo Lacus is a north polar region lake on Titan, the largest Saturnian moon. The Titanean lake encompasses an area of 20,800 square kilometers (8,000 square miles), according to the National Aeronautics and Space Administration (NASA) Jet Propulsion Laboratory’s (JPL) Photojournal website.

The image of glinting Jingpo Lacus was obtained approximately 33 days before Saturn’s spring equinox. The CICLOPS (Cassini Imaging Central Laboratory for Operations) website, which officially sources Cassini images of the Saturnian system, details the Saturnian vernal (Latin: vernalis, “of or pertaining to spring”) equinox as taking place Tuesday, Aug. 11, at 00:15 Coordinated Universal Time (Monday, Aug. 10, at 8:15 p.m. Eastern Daylight Time). Saturn’s orbital period of approximately 29 Earth years explains the occurrence of its spring equinox approximately every 15 Earth years.

NASA’s Cassini Orbiter detected the sunlight reflected off Jingpo Lacus during the spacecraft’s 59th flyby of Titan. The image was obtained at an approximate distance of 200,000 kilometers (120,000 miles). Cassini’s Visual and Infrared Mapping Spectrometer created the image via light wavelengths in the 5 micron range.

The image resolution detailed approximately 100 kilometers (60 miles) per pixel. The German Aerospace Center (Deutsches Zentrum für Luft- und Raumfahrt; DLR) in Berlin, Germany, and the University of Arizona in Tucson collaborated in the image’s processing.

Dr. Katrin Stephan was “. . . the first to see the glint on July 10th,” according to JPL media relations specialist and science writer Jia-Rui Cook’s Dec. 17, 2009, post on NASA’s Cassini Mission News webpages. Dr. Stephan, who is an associate member of the VIMS team, processed the initial image.

“I was instantly excited because the glint reminded me of an image of our own planet taken from orbit around Earth, showing a reflection of sunlight on an ocean,” Stephan recalled. “But we also had to do more work to make sure the glint we were seeing wasn’t lightning or an erupting volcano.”

The NASA JPL Photojournal website’s Dec. 17, 2009, posting announced that the glint “. . . confirmed the presence of liquid in the moon’s northern hemisphere, where lakes are more numerous and larger than those in the southern hemisphere.”

Cassini co-investigator Ralf Jaumann noted the glint finding as revelatory of the stability of Kraken Mare’s shoreline over the past three years and of an ongoing Titanean cycle of surfacing liquids.

“These results remind us how unique Titan is in the solar system,” Jaumann observed for Jia-Rui Cook’s Dec. 17, 2009, post. “But they also show us that liquid has a universal power to shape geological surfaces in the same way, no matter what the liquid is.”

Cassini project scientist Robert (Bob) Pappalardo considered: “This one image communicates so much about Titan -- thick atmosphere, surface lakes and an otherworldliness.” He described the image as “. . . an unsettling combination of strangeness yet similarity to Earth. This picture is one of Cassini’s iconic images.”

The takeaways for glinting Jingpo Lacus during Cassini Orbiter’s Titan flyby July 8, 2009, are that the spacecraft’s Visible and Infrared Mapping Spectrometer (VIMS) obtained the image approximately 33 days before Saturn’s spring equinox; that the image captured a specular reflection, in which light waves reflected, mirror-like, from the smooth, mirror-like surface of Jingpo Lacus; and that the image confirmed a liquid presence in Titan’s northern hemisphere.

Cassini false-color mosaic shows Jingpo Lacus (blue; lower center left) in Saturnian moon Titan’s north polar region; NASA ID PIA10008; image addition date Oct. 11, 2007; image credit NASA/JPL-Caltech/USGS: May be used for any purpose without prior permission, via NASA JPL Photojournal

Acknowledgment

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

Image credits:

Cassini Orbiter’s Visible and Infrared Mapping Spectrometer’s (VIMS) July 8, 2009, image capture of sunlight reflected from the north polar region’s Jingpo Lacus confirms liquid presence in Titan’s northern hemisphere; NASA ID PIA12481; image added Dec. 17, 2009; image credit NASA/JPL/University of Arizona/DLR: May be used for any purpose without prior permission, via NASA JPL Photojournal @ https://photojournal.jpl.nasa.gov/catalog/PIA12481;
Generally not subject to copyright in the United States; may use this material for educational or informational purposes, including photo collections, textbooks, public exhibits, computer graphical simulations and Internet Web pages; general permission extends to personal Web pages, via NASA Image and Video Library @ https://images.nasa.gov/details-PIA12481

Cassini false-color mosaic shows Jingpo Lacus (blue; lower center left) in Saturnian moon Titan’s north polar region; NASA ID PIA10008; image addition date Oct. 11, 2007; image credit NASA/JPL-Caltech/USGS: May be used for any purpose without prior permission, via NASA JPL Photojournal @ https://photojournal.jpl.nasa.gov/catalog/?IDNumber=PIA10008;
Public Domain, via Wikimedia Commons @ https://commons.wikimedia.org/wiki/File:PIA10008_Seas_and_Lakes_on_Titan_full_size.jpg

For further information:

Brown, Robert H.; Jean-Pierre Lebreton; and J. Hunter Waite, eds. Titan From Cassini Huygens. New York NY: Springer Science+Business Media B.V., 2009.

CICLOPS Cassini Imaging Central Laboratory for Operations. “Rev116: Aug 3-Aug 19 ’09.” CICLOPS > Newsroom.
Available @ http://ciclops.org/view/5751/Rev116

Cook, Jia-Rui C. “Sunlight Glint Confirms Liquid in Titan Lake Zone.” NASA > Mission Pages > Current Missions > Cassini-Huygens Mission to Saturn. Dec. 17, 2009.
Available @ https://www.nasa.gov/mission_pages/cassini/whycassini/cassini20091217.html

ESA European Space Agency. “Titan -- From Discovery to Encounter.” European Space Agency Science and Technology > Conferences.
Available @ https://sci.esa.int/web/conferences/-/35018-titan-from-discovery-to-encounter-conference-presentations

International Astronomical Union (IAU) / U.S. Geological Survey (USGS) Gazetteer of Planetary Nomenclature. “Categories (Themes) for Naming Features on Planets and Satellites.” USGS Astrogeology Science Center > Gazetteer of Planetary Nomenclature > Documentation > Surface Feature Categories.
Available @ https://planetarynames.wr.usgs.gov/Page/Categories

International Astronomical Union (IAU) / U.S. Geological Survey (USGS) Gazetteer of Planetary Nomenclature. “Jingpo Lacus.” USGS Astrogeology Science Center > Gazetteer of Planetary Nomenclature > Nomenclature > Saturn > Titan. Last updated March 29, 2010.
Available @ https://planetarynames.wr.usgs.gov/Feature/14655

International Astronomical Union (IAU) / U.S. Geological Survey (USGS) Gazetteer of Planetary Nomenclature. “Target: Titan.” USGS Astrogeology Science Center > Gazetteer of Planetary Nomenclature > Nomenclature > Saturn > Titan.
Available @ https://planetarynames.wr.usgs.gov/Page/TITAN/target

Lakdawalla, Emily. “Cassini VIMS Sees the Long-Awaited Glint Off a Titan Lake.” The Planetary Society > Blogs. Dec. 17, 2009.
Available @ https://www.planetary.org/blogs/emily-lakdawalla/2009/2267.html

Lavoie, Sue, site mgr. “PIA10008: Reflection of Sunlight Off Titan Lake.” NASA Jet Propulsion Laboratory Photojournal > Catalog. Image addition date: 2007-10-11.
Available @ https://photojournal.jpl.nasa.gov/catalog/PIA12481

Lavoie, Sue, site mgr. “PIA12481: Titan’s North Polar Region.” NASA Jet Propulsion Laboratory Photojournal > Catalog. Image addition date: 2009-12-7.
Available @ https://photojournal.jpl.nasa.gov/catalog/PIA12481

Levy, David H. Skywatching. Revised and updated. San Francisco CA: Fog City Press, 1994.

Marriner, Derdriu. “Christiaan Huygens Discovered Saturnian Satellite Titan March 25, 1655.” Earth and Space News. Wednesday, March 28, 2012.
Available @ https://earth-and-space-news.blogspot.com/2014/03/christiaan-huygens-discovered-saturnian.html

Marriner, Derdriu. “Visible and Infrared Mapping Spectrometer VIMS Shows Titanean Surface.” Earth and Space News. Wednesday, March 30, 2011.
Available @ https://earth-and-space-news.blogspot.com/2012/03/visible-and-infrared-mapping.html

U.S. Geological Survey Astrogeology Science Center. “New Lacus Name on Titan.” USGS Astrogeology Science Center > News. March 29, 2010.
Available @ https://astrogeology.usgs.gov/news/nomenclature/new-lacus-name-on-titan

Watanabe, Susan, page ed. “The Rite of Spring.” NASA > Mission Pages > Current Missions > Cassini-Huygens Mission to Saturn. Sept. 21, 2009.
Available @ https://www.nasa.gov/mission_pages/cassini/multimedia/pia11667.html