Desargues (crater)
Desargues is an ancient lunar impact crater that is located near the northern limb of the Moon, on the western hemisphere. It lies nearly due south of the crater Pascal, and southeast of Brianchon. The proximity of this crater to the limb means that it appears highly elongated due to foreshortening, and it is difficult to discern details from the Earth.
 LRO mosaic | |
| Coordinates | 70.2°N 73.3°W |
|---|---|
| Diameter | 85 km |
| Depth | Unknown |
| Colongitude | 77° at sunrise |
| Eponym | Gérard Desargues |
This formation has been significantly eroded and degraded with the passage of time, leaving a low, irregular rim that has been reshaped by subsequent impacts. The rim has a notable bulge to the northeast, and a lesser bulge along the southern rim. The later remains as an imprint of a ghost crater in the surface that overlies the southern rim, and leaves a remnant of its northern rim in the crater floor.
The bulge to the northeast has left a remnant of its origin in the crater floor, as a series of low hills extending from the north and southeast. These enclose the northeastern third of the floor, and are suggestive of an overlapping crater formation. This crater is overlain in turn by a pair of craters that lie across the eastern rim.
The floor of the crater is level and has most likely been resurfaced by subsequent lava flows, or by fallback and ejecta deposits. This wiped away much of the original structure of the interior, leaving ridges and traces where once lay crater rims. Other lesser craters intrude into the rim, with Desargues M forming a bulge into the southern rim and Desargues A overlying the northern rim.
Satellite craters
By convention these features are identified on lunar maps by placing the letter on the side of the crater midpoint that is closest to Desargues.
| Desargues | Latitude | Longitude | Diameter |
|---|---|---|---|
| A | 71.4° N | 75.3° W | 30 km |
| B | 70.7° N | 65.0° W | 50 km |
| C | 69.7° N | 78.4° W | 12 km |
| D | 69.3° N | 69.6° W | 11 km |
| E | 70.2° N | 67.4° W | 31 km |
| K | 68.5° N | 67.2° W | 10 km |
| L | 69.6° N | 82.2° W | 13 km |
| M | 68.4° N | 73.9° W | 30 km |
References
- Andersson, L. E.; Whitaker, E. A. (1982). NASA Catalogue of Lunar Nomenclature. NASA RP-1097.CS1 maint: ref=harv (link)
- Blue, Jennifer (July 25, 2007). "Gazetteer of Planetary Nomenclature". USGS. Retrieved 2007-08-05.CS1 maint: ref=harv (link)
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- McDowell, Jonathan (July 15, 2007). "Lunar Nomenclature". Jonathan's Space Report. Retrieved 2007-10-24.CS1 maint: ref=harv (link)
- Menzel, D. H.; Minnaert, M.; Levin, B.; Dollfus, A.; Bell, B. (1971). "Report on Lunar Nomenclature by the Working Group of Commission 17 of the IAU". Space Science Reviews. 12 (2): 136–186. Bibcode:1971SSRv...12..136M. doi:10.1007/BF00171763.
- Moore, Patrick (2001). On the Moon. Sterling Publishing Co. ISBN 978-0-304-35469-6.CS1 maint: ref=harv (link)
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- Rükl, Antonín (1990). Atlas of the Moon. Kalmbach Books. ISBN 978-0-913135-17-4.CS1 maint: ref=harv (link)
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