Ritter (crater)

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Crater characteristics
Sabine (center right) and Ritter (right) craters. NASA photo.
Coordinates	2.0° N, 19.2° E
Diameter	29 km
Depth	1.3 km
Colongitude	341° at sunrise
Eponym	Karl Ritter August Ritter

Ritter is a lunar crater located near the southwest edge of Mare Tranquillitatis. It is the northwest member of a crater pair with Sabine crater to the southeast. The two rims are separated by a narrow valley only a couple of kilometers wide. To the northwest is the Dionysius crater, and to the north-northeast are the Manners and Arago craters.

This crater is roughly circular but with an irregular outer rim. The inner walls have slumped down toward the floor. The interior is irregular with several low ridges. To the northwest of Ritter crater is a system of parallel rilles designated Rimae Ritter. These follow a course to the northwest.

[edit] Satellite craters

By convention these features are identified on lunar maps by placing the letter on the side of the crater mid-point that is closest to Ritter crater.

Ritter	Latitude	Longitude	Diameter
B	3.3° N	18.9° E	14 km
C	2.8° N	18.9° E	14 km
D	3.7° N	18.8° E	7 km

[edit] References

• Andersson, L. E.; Whitaker, E. A., (1982). NASA Catalogue of Lunar Nomenclature. NASA RP-1097. 
• Blue, Jennifer (July 25, 2007). Gazetteer of Planetary Nomenclature. USGS. Retrieved on 2007-08-05.
• Bussey, B.; Spudis, P. (2004). The Clementine Atlas of the Moon. New York: Cambridge University Press. ISBN 0-521-81528-2. 
• Cocks, Elijah E.; Cocks, Josiah C. (1995). Who's Who on the Moon: A Biographical Dictionary of Lunar Nomenclature. Tudor Publishers. ISBN 0-936389-27-3. 
• McDowell, Jonathan (July 15, 2007). Lunar Nomenclature. Jonathan's Space Report. Retrieved on 2007-10-24.
• 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: 136. 
• Moore, Patrick (2001). On the Moon. Sterling Publishing Co.. ISBN 0-304-35469-4. 
• Price, Fred W. (1988). The Moon Observer's Handbook. Cambridge University Press. ISBN 0521335000. 
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• Webb, Rev. T. W. (1962). Celestial Objects for Common Telescopes, 6th revision, Dover. ISBN 0-486-20917-2. 
• Whitaker, Ewen A. (1999). Mapping and Naming the Moon. Cambridge University Press. ISBN 0-521-62248-4. 
• Wlasuk, Peter T. (2000). Observing the Moon. Springer. ISBN 1852331933.