Euclides (crater)

Euclides

Lunar Orbiter 4 image
Diameter	12 km
Depth	1.3 km
Colongitude	29° at sunrise
Eponym	Euclid

Oblique Panoramic Camera image of Euclides from Apollo 16

Euclides is a small lunar impact crater located near the eastern edge of Oceanus Procellarum, about 30 kilometers to the west of the Montes Riphaeus mountains. The mare in the vicinity is devoid of significant craters, but to the west is an area of low rises. The crater is named after the Greek mathematician Euclid.

Euclides is a bowl-shaped formation with a circular rim. It is surrounded by streaks of ejecta that have a higher albedo than the nearby maria. This nebulous skirt of light-hued material makes this feature very prominent under a high Sun, and it is one of the brightest sites on the Moon.

Euclides D

Lunar Orbiter 4 image of Euclides D

Euclides D is a small lunar impact crater in the Mare Cognitum. It has a diameter of 6 kilometers and a depth of 1.3 kilometers. It lies to the southeast of Euclides, beyond the Montes Riphaeus mountains.

In 1976, Euclides D was renamed Eppinger by the IAU to honor Hans Eppinger, a professor of pathological anatomy at Graz. However in 2002, after Eppinger's association with Nazi prison camps had been brought to the attention of the IAU's Working Group for Planetary System Nomenclature, the name was changed.

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 Euclides.

Euclides	Latitude	Longitude	Diameter
C	13.2° S	30.0° W	10 km
D	9.4° S	25.7° W	6 km
E	6.3° S	25.1° W	4 km
F	6.3° S	33.7° W	5 km
J	6.4° S	28.5° W	4 km
K	4.2° S	24.7° W	6 km
M	10.4° S	28.2° W	6 km
P	4.5° S	27.6° W	66 km

The following craters have been renamed by the IAU.

• Euclides B — See Norman.

References

• Enersen, Ole Daniel (2007). "Hans Eppinger". Who Named It?. Retrieved 2007-08-07.

• Andersson, L. E.; Whitaker, E. A. (1982). NASA Catalogue of Lunar Nomenclature. NASA RP-1097. {{cite book}}: Invalid |ref=harv (help)
• Blue, Jennifer (July 25, 2007). "Gazetteer of Planetary Nomenclature". USGS. Retrieved 2007-08-05. {{cite web}}: Invalid |ref=harv (help)
• Bussey, B.; Spudis, P. (2004). The Clementine Atlas of the Moon. New York: Cambridge University Press. ISBN 978-0-521-81528-4. {{cite book}}: Invalid |ref=harv (help)
• Cocks, Elijah E.; Cocks, Josiah C. (1995). Who's Who on the Moon: A Biographical Dictionary of Lunar Nomenclature. Tudor Publishers. ISBN 978-0-936389-27-1. {{cite book}}: Invalid |ref=harv (help)
• McDowell, Jonathan (July 15, 2007). "Lunar Nomenclature". Jonathan's Space Report. Retrieved 2007-10-24. {{cite web}}: Invalid |ref=harv (help)
• Moore, Patrick (2001). On the Moon. Sterling Publishing Co. ISBN 978-0-304-35469-6. {{cite book}}: Invalid |ref=harv (help)
• Price, Fred W. (1988). The Moon Observer's Handbook. Cambridge University Press. ISBN 978-0-521-33500-3. {{cite book}}: Invalid |ref=harv (help)
• Rükl, Antonín (1990). Atlas of the Moon. Kalmbach Books. ISBN 978-0-913135-17-4. {{cite book}}: Invalid |ref=harv (help)
• Webb, Rev. T. W. (1962). Celestial Objects for Common Telescopes (6th revision ed.). Dover. ISBN 978-0-486-20917-3. {{cite book}}: Invalid |ref=harv (help)
• Whitaker, Ewen A. (1999). Mapping and Naming the Moon. Cambridge University Press. ISBN 978-0-521-62248-6. {{cite book}}: Invalid |ref=harv (help)
• Wlasuk, Peter T. (2000). Observing the Moon. Springer. ISBN 978-1-85233-193-1. {{cite book}}: Invalid |ref=harv (help)