Summary: Seyfert Crater honors American astrophysicist Carl Keenan Seyfert, who identified and studied the galactic type now known as Seyfert galaxies.
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| Detail of Lunar Aeronautical Chart (LAC) 47 shows far side’s Seyfert Crater with rim satellite A (upper center), eastern neighbor Innes S (center right), southeastern neighbor Polzunov (lower) and western neighbor Espin E (center left); scale 1:1,000,000 Polar Stereographic Projection: Courtesy NASA/GSFC (Goddard Space Flight Center)/ASU (Arizona State University), via IAU/USGS Astrogeology Science Center Gazetteer of Planetary Nomenclature |
The lunar far side's Seyfert Crater honors American astrophysicist Carl Keenan Seyfert, who identified and investigated the class of active galaxy that is now known as Seyfert galaxies.
Seyfert Crater resides in the low latitudes of the northern hemisphere on the moon's far side. The lunar impact crater's location places its western boundary approximately 22 degrees behind the near side's eastern limb.
The crater's western inner wall is thicker than its eastern inner wall. A series of craters cluster on the eastern rim and along the eastern inner wall.
The far side crater's interior floor appears fairly level. Numerous craterlets dot the floor.
Seyfert Crater is centered at 29.26 degrees north latitude, 114.34 degrees east longitude, according to International Astronomical Union’s (IAU) Gazetteer of Planetary Nomenclature. Its northernmost and southernmost latitudes occur at 30.96 degrees north and 27.57 degrees north, respectively. Easternmost and westernmost longitudes are obtained at 116.27 degrees east and 112.4 degrees east, respectively. Minkowski’s diameter spans 102.63 kilometers.
Seyfert parents one satellite, Seyfert A. The Seyfert Crater system's sole satellite overlies its parent's northeastern rim. A ridge is positioned at the approximate midpoint of Seyfert A's interior floor.
Seyfert A is centered at 30.56 degrees north latitude, 115.08 degrees east longitude. The satellite's northernmost and southernmost latitudes are found at 31.38 degrees north and 29.74 degrees north, respectively. It finds its easternmost and westernmost longitudes at 116.07 degrees east and 114.08 degrees east, respectively. Seyfert A has a diameter of 51.97 kilometers.
Seyfert Crater's nearest named northern neighbor is Harriot Crater. As a bulge across its parent's northeastern rim, Seyfert A qualifies as Harriot Crater's closest component in the Seyfert Crater system.
Harriot Crater is centered at 33.2 degrees north latitude, 114.4 degrees east longitude, respectively. The soft-edged crater presents northermost and southernmost latitudes of 34.07 degrees north and 32.33 degrees north, respectively. It posts easternmost and westernmost longitudes of 115.44 degrees east and 113.36 degrees east, respectively. Harriot Crater's diameter measures 52.77 kilometers.
Seyfert Crater's nearest named eastern neighbor is Innes S. As the westernmost of the Innes Crater system's three satellites, Innes S is interposed between its parent and Seyfert.
Innes S is centered at 27.53 degrees north latitude, 117.42 degrees east longitude. The satellite posts northernmost and southernmost latitudes of 28.08 degrees north and 26.98 degrees north, respectively. S places its easternmost and westernmost longitudes at 118.04 degrees east and 116.8 degrees east, respectively. Innes S's diameter measures 33.47 kilometers.
Seyfert Crater's nearest named southern neighbor is Polzunov Crater. The worn impact crater lies to the south-southeast of Seyfert Crater.
Polzunov Crater is centered at 25.57 degrees north latitude, 115.01 degrees east longitude. It registers northernmost and southernmost latitudes of 26.66 degrees north and 24.47 degrees north, respectively. It records easternmost and westernmost longitudes of 116.22 degrees east and 113.79 degrees east longitude, respectively. Polzunov Crater's diameter measures 66.53 kilometers.
Seyfert Crater's nearest named western neighbor is Espin E. The Espin Crater system's only satellite intervenes between its parent and Seyfert.
Espin E is centered at 28.43 degrees north latitude, 111.58 degrees east longitude. The satellite marks its northernmost and southernmost latitudes at 28.96 degrees north and 27.9 degrees north, respectively. It establishes its easternmost and westernmost longitudes occur at 112.18 degrees east and 110.98 degrees east, respectively. Espin E has a diameter of 32.16 kilometers.
Seyfert Crater honors American astronomer and astrophysicist Carl Keenan Seyfert (Feb. 11, 1911-June 13, 1960). The IAU approved primary crater Seyfert’s name in 1970, during the organization’s XIVth (14th) General Assembly, held from Tuesday, Aug. 18, to Thursday, Aug. 27, 1970, in Brighton, United Kingdom. Satellite A's designation received approval in 2006, during the IAU’s XXVIth (26th) General Assembly, held in Prague, Czech Republic, from Monday, Aug. 14, to Friday, Aug. 25.
In his Astronomy Encyclopedia (2002), English amateur astronomer Sir Patrick Moore (March 4, 1923-Dec. 9, 2012) pointed to identification and investigation of a class of active galaxies as Seyfert's "most famous research" (page 363). Seyfert reported his findings in the January 1943 issue of the Astrophysical Journal. For his research, he selected the six brightest of 12 known examplars: NGC 1068, 1275, 3516, 4051, 4151, 7469. In The Biographical Dictionary of Scientists: Astronomers (1984), science textbook author David Abbott noted ongoing studies of Seyfert galaxies. NGC 1068, 1275 and 4151 rate as "the most intensively studied" (page 144).
The takeaway for the lunar far side's Seyfert Crater honoring American astrophysicist Carl Keenan Seyfert is that the parent and one satellite in the Seyfert Crater system have as namesake the 20th-century astronomer and astrophysicist who also is remembered in Seyfert galaxies, the new, spectra-rich class of extragalactic nebulae that he identified and examined.
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| Detail of Apollo 16 image, taken during TE (trans-Earth) orbit, April 1972, with mapping/metric camera, gives northwest-facing oblique view of Seyfert Crater and its rim satellite, Seyfert A; NASA ID AS16-M-3001; Apollo Image Archive, NASA / JSC (Johnson Space Center) / Arizona State University: JStuby (James L. Stuby), 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:
Image credits:
Detail of Lunar Aeronautical Chart (LAC) 47 shows far side’s Seyfert Crater with rim satellite A (upper center), eastern neighbor Innes S (center right), southeastern neighbor Polzunov (lower) and western neighbor Espin E (center left); scale 1:1,000,000 Polar Stereographic Projection: Courtesy NASA/GSFC (Goddard Space Flight Center)/ASU (Arizona State University), via IAU/USGS Astrogeology Science Center Gazetteer of Planetary Nomenclature @ https://planetarynames.wr.usgs.gov/images/Lunar/lac_47_wac.pdf
Detail of Apollo 16 image, taken during TE (trans-Earth) orbit, April 1972, with mapping/metric camera, gives northwest-facing oblique view of Seyfert Crater and its rim satellite, Seyfert A; NASA ID AS16-M-3001; Apollo Image Archive, NASA / JSC (Johnson Space Center) / Arizona State University: JStuby (James L. Stuby), Public Domain, via Wikimedia Commons @ https://commons.wikimedia.org/wiki/File:Seyfert_crater_AS16-M-3001_ASU.jpg
For further information:
For further information:
De Jager, C. (Cornelius) ; and A. (Arnost) Jappel, eds. XIVth General Assembly -- Transactions of the IAU Vol. XIV B Proceedings of the 14th General Assembly Brighton, United Kingdom, August 18-27, 1970. Washington DC: Association of Universities for Research in Astronomy, Jan. 1, 1971.
Available @ https://www.iau.org/publications/iau/transactions_b/
Available @ https://www.iau.org/publications/iau/transactions_b/
International Astronomical Union (IAU) / U.S. Geological Survey (USGS) Gazetteer of Planetary Nomenclature. “Espin E.” USGS Astrogeology Science Center > Gazetteer of Planetary Nomenclature > Nomenclature > The Moon. Last updated Oct. 18, 2010.
Available @ https://planetarynames.wr.usgs.gov/Feature/8994
Available @ https://planetarynames.wr.usgs.gov/Feature/8994
International Astronomical Union (IAU) / U.S. Geological Survey (USGS) Gazetteer of Planetary Nomenclature. “Harriot.” USGS Astrogeology Science Center > Gazetteer of Planetary Nomenclature > Nomenclature > The Moon. Last updated Oct. 18, 2010.
Available @ https://planetarynames.wr.usgs.gov/Feature/2374
Available @ https://planetarynames.wr.usgs.gov/Feature/2374
International Astronomical Union (IAU) / U.S. Geological Survey (USGS) Gazetteer of Planetary Nomenclature. “Innes S.” USGS Astrogeology Science Center > Gazetteer of Planetary Nomenclature > Nomenclature > The Moon. Last updated Oct. 18, 2010.
Available @ https://planetarynames.wr.usgs.gov/Feature/10140
Available @ https://planetarynames.wr.usgs.gov/Feature/10140
International Astronomical Union (IAU) / U.S. Geological Survey (USGS) Gazetteer of Planetary Nomenclature. “Polzunov.” USGS Astrogeology Science Center > Gazetteer of Planetary Nomenclature > Nomenclature > The Moon. Last updated Oct. 18, 2010.
Available @ https://planetarynames.wr.usgs.gov/Feature/4789
Available @ https://planetarynames.wr.usgs.gov/Feature/4789
International Astronomical Union (IAU) / U.S. Geological Survey (USGS) Gazetteer of Planetary Nomenclature. “Seyfert.” USGS Astrogeology Science Center > Gazetteer of Planetary Nomenclature > Nomenclature > The Moon. Last updated Oct. 18, 2010.
Available @ https://planetarynames.wr.usgs.gov/Feature/5446
Available @ https://planetarynames.wr.usgs.gov/Feature/5446
International Astronomical Union (IAU) / U.S. Geological Survey (USGS) Gazetteer of Planetary Nomenclature. “Seyfert A.” USGS Astrogeology Science Center > Gazetteer of Planetary Nomenclature > Nomenclature > The Moon. Last updated Oct. 18, 2010.
Available @ https://planetarynames.wr.usgs.gov/Feature/13055
Available @ https://planetarynames.wr.usgs.gov/Feature/13055
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Available @ https://planetarynames.wr.usgs.gov/Page/MOON/target
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Available via Harvard ADSABS (NASA Astrophysics Data System Abstract Service) @ http://articles.adsabs.harvard.edu/pdf/1943ApJ....97...28S
Available via Harvard ADSABS (NASA Astrophysics Data System Abstract Service) @ http://articles.adsabs.harvard.edu/full/1943ApJ....97...28S
Available via Harvard ADSABS (NASA Astrophysics Data System Abstract Service) @ http://articles.adsabs.harvard.edu/pdf/1943ApJ....97...28S
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Available @ https://www.iau.org/publications/iau/transactions_b/
Available @ https://www.iau.org/publications/iau/transactions_b/
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