Summary: Ramsden Crater parents three satellites in western Palus Epidemiarum (Marsh of Epidemics) in the lunar near side’s southwestern quadrant.
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| Detail of Lunar Astronautical Charts (LAC) 111 shows Ramsden Crater with its three satellites and nearest named neighbor, Lepaute Crater, in the lunar near side’s Palus Epidemiarum (Marsh of Epidemics); courtesy NASA (National Aeronautics and Space Administration) / GSFC (Goddard Space Flight Center) / ASU (Arizona State University): U.S. Geological Survey, Public Domain, via USGS Astrogeology Center / Gazetteer of Planetary Nomenclature |
Ramsden Crater parents three satellites in western Palus Epidemiarum (Marsh of Epidemics), a small lunar mare (Latin: mare, “sea”) lying south of Mare Humorum (Sea of Moisture) and Mare Nubium (Sea of Clouds) in the lunar near side’s southwestern quadrant.
Lava-flooded Ramsden Crater is centered at minus 32.96 degrees south latitude, 31.87 degrees west longitude, according to the International Astronomical Union’s (IAU) Gazetteer of Planetary Nomenclature. The southern hemisphere primary crater finds its northernmost and southernmost latitudes at minus 32.54 degrees south and minus 33.37 degrees south, respectively. The western hemisphere crater obtains its easternmost and westernmost longitudes to minus 31.46 degrees west and minus 32.29 degrees west, respectively. Ramsden Crater’s diameter measures 25.11 kilometers.
Ramsden Crater parents three satellites. All three satellites exhibit southerly placements with respect to their parent.
Ramsdan A resides in neighborly closeness to the southeast of its parent in Palus Epidemiarum. Ramsden A’s placement qualifies it as the most easterly of the Ramsden Crater system’s three satellites.
The Ramsden Crater system’s other two satellites, Ramsden G and Ramsden H are located more distantly from their parent. They lie along the southern edge of Palus Epidemiarum, to the south-southeast and south-southwest, respectively, of their parent.
Ramsden H is sited to the southwest of Ramsden G. Ramsden H’s placement qualifies it as the Ramsden Crater system’s most westerly and most southerly satellite.
Ramsden A is centered at minus 33.5 degrees south latitude, minus 31.43 degrees west longitude. Satellite A confines its northernmost and southernmost latitudes to minus 33.41 degrees south and minus 33.59 degrees south, respectively. It restricts its easternmost and westernmost longitudes to minus 31.32 degrees west and minus 31.53 degrees west, respectively. Ramsden A has a diameter of 5.26 kilometers.
Ramsden G is centered at minus 35.35 degrees south latitude, minus 31.67 degrees west longitude. It posts northernmost and southernmost latitudes of minus 35.17 degrees south and minus 35.53 degrees south, respectively. It marks its easternmost and westernmost longitudes at minus 31.45 degrees west and minus 31.89 degrees west, respectively. Ramsden G’s diameter measures 11.02 kilometers.
Ramsden H is centered at minus 35.71 degrees south latitude, minus 32.47 degrees west longitude. Its northernmost and southernmost latitudes occur at minus 35.52 degrees south and minus 35.9 degrees south, respectively. Its easternmost and westernmost longitudes are established at minus 32.23 degrees west and minus 32.7 degrees west, respectively. Ramsden H’s diameter measures 11.43 kilometers.
The Ramsden Crater system’s primary crater sits upon a system of intersecting rilles (German: rille, “groove”). The rille system’s name, Rimae Ramsden, reflects its association with Ramsden Crater. Rimae Ramsden extensively meanders across western Palus Epidemiarum.
Rimae Ramsden is centered at minus 32.93 degrees south latitude, minus 31.32 degrees west longitude. The rille system’s northernmost and southernmost latitudes extend to minus 31.63 degrees south and minus 34.71 degrees south, respectively. Its easternmost and westernmost longitudes reach minus 29.8 degrees west and minus 33.14 degrees west, respectively. Rimae Ramsden’s diameter spans 100 kilometers, according to the U.S. Geological Survey Astrogeology Science Center-maintained website of the International Astronomical Union’s (IAU) Gazetteer of Planetary Nomenclature.
The busiest confluence of branchings of Rimae Ramsden occurs around Ramsden Crater. Ramsden A’s location in proximity to its parent also gives it the greatest exposure of the Ramsden Crater system’s satellites to Rimae Ramsden. Ramsden Crater and three rille branchings surround Ramsden A. Rima Ramsden I passes before northeastern Ramsden A in a northwest-southeast orientation. Rima Ramsden II crowds southeastern Ramsden A in a northeast-southwesterly orientation. To the west, Rima Ramsden V cuts in a slight north-southeast orientation.
The Ramsden Crater system’s two southernmost satellites are removed from the rille system’s hub of activity. At least one branch, Rima Ramsden II, however, points toward Ramsden G in its traversal of southwestern Palus Epidemiarum, according to the Geologic Map of the Wilhelm Quadrangle of the Moon by R. Stephen Saunders and Don E. Wilhelms, published by the U.S. Geological Survey in 1974.
The takeaways for Ramsden Crater’s parentage of three satellites in western Palus Epidemiarum (Marsh of Epidemics) are that Ramsden A resides in satellite closeness to the Ramsden Crater system’s primary crater; that the Ramsden Crater system’s two most southerly satellites, Ramsden G and Ramsden H, lie along the lunar mare’s southern edge; and that the Ramsden Crater system’s associated rille system wanders across western Palus Epidemiarum.
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| Detail shows Ramsden Crater system’s (upper left) primary crater, with nearby satellite A, in a surround of the system’s network of intersecting rilles, Rimae Ramsden, and with southerly satellites (lower left), Ramsden G and Ramsden H, in western Palus Epidemiarum (Marsh of Epidemics); R.S. Saunders and D.E. Wilhelms, Geologic Map of the Wilhelm Quadrangle of the Moon (1974): U.S. Geological Survey, via USGS Publications Warehouse |
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 Astronautical Charts (LAC) 111 shows Ramsden Crater with its three satellites and nearest named neighbor, Lepaute Crater, in the lunar near side’s Palus Epidemiarum (Marsh of Epidemics); courtesy NASA (National Aeronautics and Space Administration) / GSFC (Goddard Space Flight Center) / ASU (Arizona State University): U.S. Geological Survey, Public Domain, via USGS Astrogeology Center / Gazetteer of Planetary Nomenclature @ https://planetarynames.wr.usgs.gov/images/Lunar/lac_111_wac.pdf
Detail shows Ramsden Crater system’s (upper left) primary crater, with nearby satellite A, in a surround of the system’s network of intersecting rilles, Rimae Ramsden, and with southerly satellites (lower left), Ramsden G and Ramsden H, in western Palus Epidemiarum (Marsh of Epidemics); R.S. Saunders and D.E. Wilhelms, Geologic Map of the Wilhelm Quadrangle of the Moon (1974): U.S. Geological Survey, via USGS Publications Warehouse @ https://pubs.usgs.gov/imap/0824/plate-1.pdf
For further information:
For further information:
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International Astronomical Union (IAU) / U.S. Geological Survey (USGS) Gazetteer of Planetary Nomenclature. “Palus Epidemiarum.” USGS Astrogeology Science Center > Gazetteer of Planetary Nomenclature > Nomenclature > The Moon. Last updated Oct. 18, 2010.
Available @ https://planetarynames.wr.usgs.gov/Feature/4565
Available @ https://planetarynames.wr.usgs.gov/Feature/4565
International Astronomical Union (IAU) / U.S. Geological Survey (USGS) Gazetteer of Planetary Nomenclature. “Ramsden.” USGS Astrogeology Science Center > Gazetteer of Planetary Nomenclature > Nomenclature > The Moon. Last updated Oct. 18, 2010.
Available @ https://planetarynames.wr.usgs.gov/Feature/4940
Available @ https://planetarynames.wr.usgs.gov/Feature/4940
International Astronomical Union (IAU) / U.S. Geological Survey (USGS) Gazetteer of Planetary Nomenclature. “Ramsden A.” USGS Astrogeology Science Center > Gazetteer of Planetary Nomenclature > Nomenclature > The Moon. Last updated Oct. 18, 2010.
Available @ https://planetarynames.wr.usgs.gov/Feature/12445
Available @ https://planetarynames.wr.usgs.gov/Feature/12445
International Astronomical Union (IAU) / U.S. Geological Survey (USGS) Gazetteer of Planetary Nomenclature. “Ramsden G.” USGS Astrogeology Science Center > Gazetteer of Planetary Nomenclature > Nomenclature > The Moon. Last updated Oct. 18, 2010.
Available @ https://planetarynames.wr.usgs.gov/Feature/12446
Available @ https://planetarynames.wr.usgs.gov/Feature/12446
International Astronomical Union (IAU) / U.S. Geological Survey (USGS) Gazetteer of Planetary Nomenclature. “Ramsden H.” USGS Astrogeology Science Center > Gazetteer of Planetary Nomenclature > Nomenclature > The Moon. Last updated Oct. 18, 2010.
Available @ https://planetarynames.wr.usgs.gov/Feature/12447
Available @ https://planetarynames.wr.usgs.gov/Feature/12447
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Available @ https://planetarynames.wr.usgs.gov/Page/MOON/target
Available @ https://planetarynames.wr.usgs.gov/Page/MOON/target
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Marriner, Derdriu. “Ramsden Crater Honors British Instrument Maker Jesse Ramsden.” Earth and Space News. Wednesday, Sept. 25, 2013.
Available @ https://earth-and-space-news.blogspot.com/2013/09/ramsden-crater-honors-british.html
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Available @ https://the-moon.us/wiki/IAU_directions
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Available @ https://the-moon.us/wiki/Palus_Epidemiarum
Available @ https://the-moon.us/wiki/Palus_Epidemiarum
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Available @ https://the-moon.us/wiki/Ramsden
Available @ https://the-moon.us/wiki/Ramsden
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Available @ http://dl.booktolearn.com/ebooks2/science/astronomy/9780521874076_observing_the_moon_b121.pdf
Available @ http://dl.booktolearn.com/ebooks2/science/astronomy/9780521874076_observing_the_moon_b121.pdf
Saunders, R.S. (Stephen); and D.(Don) E. Wilhelms. “Geologic Map of the Wilhelm Quadrangle of the Moon.” Geologic Atlas of the Moon Wilhelm Quadrangle I-824 (LAC-111). Prepared in cooperation with the National Aeronautics and Space Administration and the USAF Aeronautical Chart and Information Center. Washington DC: U.S. Geological Survey, 1974.
Available via USGS Publications Warehouse @ https://pubs.er.usgs.gov/publication/i824
Available via USGS Publications Warehouse @ https://pubs.er.usgs.gov/publication/i824
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