Sosigenes (crater)

Sosigenes

LRO image
Coordinates 8°42′N 17°36′E / 8.7°N 17.6°E / 8.7; 17.6Coordinates: 8°42′N 17°36′E / 8.7°N 17.6°E / 8.7; 17.6
Diameter 18 km
Depth 1.7 km
Colongitude 342° at sunrise
Eponym Sosigenes of Alexandria

Sosigenes is a lunar impact crater on the west edge of Mare Tranquillitatis and is named after Sosigenes of Alexandria. It lies around 35 km east of the large walled plain Julius Caesar, about 75 km southwest of Maclear and about 115 km north of Ariadaeus. The crater rim has a high albedo, making it relatively bright. It has a small central rise at the midpoint of the floor.

Its diameter is 18 km long and is 1,700 meters deep. The area is more than 225 km² and the perimeter is over 50 km.

To the east on the mare is a formation of parallel rilles designated the Rimae Sosigenes. These follow a course to the north, and have a length of about 150 kilometers. The small, bowl-shaped crater Sosignes A lies across one of these rilles. Also crossing one of the rills is a large east-west depression containing an Irregular mare patch, or IMP. IMPs are relatively rare but are thought to be some of the youngest volcanic features on the moon.

Irregular mare patch crossing Rima Sosigenes
Rimae Sosigenes, the IMP above, and Sosigenes A crater

Satellite craters

Sosigenes crater and its satellite craters taken from Earth in 2012 at the University of Hertfordshire's Bayfordbury Observatory with the telescopes Meade LX200 14" and Lumenera Skynyx 2-1

By convention these features are identified on lunar maps by placing the letter on the side of the crater midpoint that is closest to Sosigenes.

Sosigenes Latitude Longitude Diameter
A 7.8° N 18.5° E 12 km
B 8.3° N 17.2° E 4 km
C 7.2° N 18.9° E 3 km

References

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