Summary: Dorsum Thera resides in southwestern Mare Imbrium on the lunar near side to the southeast of Euler E and to the northeast of Mons Vinogradov.
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| Detail of Near Side Shaded Relief and Color-Coded Topography Map shows Dorsum Thera's (upper center) Diophantus-Mons Vinogradov-Euler neighborhood in southwestern Mare Imbrium: USGS Astrogeology Science Center / Gazetteer of Planetary Nomenclature, Public Domain, via Wikimedia Commons |
Dorsum Thera resides in southwestern Mare Imbrium on the lunar near side to the east of Euler E and northeast of Mons Vinogradov in a northwest quadrant group with Courtney, Rima Zahia and Catena Yuri.
Dorsum Thera is centered at 24.4 degrees north latitude, minus 31.42 degrees west longitude, according to the International Astronomical Union's (IAU) Gazetteer of Planetary Nomenclature. The dorsum (Latin: "ridge") establishes its northernmost and southernmost latitudes at 24.51 degrees north and 24.29 degrees north, respectively. It maintains its easternmost and westernmost longitudes at minus 31.38 degrees west and minus 31.47 degrees west, respectively. Dorsum Thera has a diameter of 7.25 kilometers.
Dorsum Thera is sited near the southwestern edges of Mare Imbrium. The ridge's location situates it to the southeast of the highland break meeting of east central Oceanus Procellarum ("Ocean of Storms") with west central Mare Imbrium ("Sea of Showers").
Mare Imbrium is centered at 34.72 degrees north latitude, minus 14.91 degrees west longitude. The dark, basaltic plain's northernmost and southernmost latitudes extend to 51.46 degrees north and 15.23 degrees north, respectively. Its easternmost and westernmost longitudes reach 8.56 degrees east and minus 38.36 degrees west, respectively. Mare Imbrium's diameter spans 1,145.53 kilometers.
Three different geological features group with Dorsum Thera in the near side's northwestern quadrant. Courtney Craterlet and Rima Zahia neighbor to the northeast of Dorsum Thera. Catena Yuri trends northwest-southeast as Dorsum Thera's eastern neighbor.
Courtney is centered at 25.14 degrees north latitude, minus 30.81 degrees west longitude. The craterlet finds its northernmost and southernmost latitudes at 25.16 degrees north and 25.11 degrees north, respectively. It places easternmost and westernmost longitudes of minus 30.78 degrees west and minus 30.83 degrees west, respectively. Courtney has a diameter of 1.24 kilometers.
Rima Zahia is centered at 25.02 degrees north latitude, minus 30.46 degrees west longitude. The fissure obtains its northernmost and southernmost latitudes at 25.25 degrees north and 24.79 degrees north, respectively. It marks its easternmost and westernmost longitudes of minus 30.36 degrees west and minus 30.49 degrees west, respectively. Rima Zahia has a diameter of 15.24 kilometers.
Catena Yuri is centered at 24.41 degrees north latitude, minus 30.38 degrees west longitude. The chain of craters details its northernmost and southernmost latitudes at 24.47 degrees north and 24.35 degrees north, respectively. The chain lists its easternmost and westernmost longitudes at minus 30.34 degrees west and minus 30.43 degrees west, respectively. Catena Yura has a diameter of 4.52 kilometers.
Euler E lies to the west of Dorsum Thera. Euler E is situated at the westernmost of Euler Crater system's six satellites.
Euler E is centered at 24.7 degrees north latitude, minus 34.07 degrees west longitude. Satellite E reveals its northernmost and southernmost latitudes at 24.8 degrees north and 24.6 degrees north, respectively. It identifies its easternmost and westernmost longitudes as minus 33.96 degrees west and minus 34.18 degrees west, respectively. Euler E's diameter measures 6.1 kilometers.
Mons Vinogradov lies to the southwest of Dorsum Thera. Prior to official name approval in 1979, the rugged massif was known as Mons Euler.
Mons Vinogradov is centered at 22.35 degrees north latitude, minus 32.52 degrees west longitude. The rugged massif's northernmost and southernmost latitudes occur at 22.81 degrees north and 21.92 degrees north, respectively. The massif encounters its easternmost and westernmost longitudes at minus 31.96 degrees west and minus 32.99 degrees west, respectively. Mons Vinogradov's diameter measures 28.73 kilometers.
Euler J lies to the south of Dorsum Thera and to the east of Mons Vinogradov. Euler J lies to the southeast of Dorsum Thera's western neighbor, Euler E.
Euler J is centered at 22.25 degrees north latitude, minus 31.51 degrees west longitude. Satellite J records northernmost and southernmost latitudes of 22.21 degrees north and 22.19 degrees north, respectively. It registers easternmost and westernmost longitudes of minus 31.44 degrees west and minus 31.57 degrees west, respectively. Euler J has a diameter of 3.71 kilometers.
Dorsum Thera numbers among 95 minor features identified with first-name designations on lunar topophotomaps prepared and published by The Defense Mapping Agency (DMA) for the National Aeronautics and Space Administration (NASA). Dorsum Thera is plotted on NASA Lunar Topophotomap 39B3S1, which was published in June 1974. The map's Names Identification lists "Courtney, Thera, Yuri, Zahia" as unofficial names used "only for the identification of features on this map."
The International Astronomical Union approved Dorsum Thera as the ridge's official name in 1976. The Gazetteer of Planetary Nomenclature identifies Thera as: "Greek female name."
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| Detail of Lunar Aeronautical Chart (LAC) 39 shows Dorsum Thera's (center right) Diophantus Crater-Mons Vinogradov neighborhood in southwestern Mare Imbrium: image credit NASA/GSFC/ASU, via USGS Astrogeology Science Center / Gazetteer of Planetary Nomenclature |
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 Near Side Shaded Relief and Color-Coded Topography Map shows Dorsum Thera's (upper center) Diophantus-Mons Vinogradov-Euler neighborhood in southwestern Mare Imbrium: USGS Astrogeology Science Center / Gazetteer of Planetary Nomenclature, Public Domain, via Wikimedia Commons @ https://commons.wikimedia.org/wiki/File:Near_side_39.jpg
Detail of Lunar Aeronautical Chart (LAC) 39 shows Dorsum Thera's (center right) Diophantus Crater-Mons Vinogradov neighborhood in southwestern Mare Imbrium: image credit NASA/GSFC/ASU, via USGS Astrogeology Science Center / Gazetteer of Planetary Nomenclature @ https://planetarynames.wr.usgs.gov/images/Lunar/lac_39_wac.pdf
For further information:
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