Theon Senior (crater)
| Diameter | 18 km |
|---|---|
| Depth | 3470 m |
| Colongitude | 345° at sunrise |
| Eponym | Theon of Smyrna |
Theon Senior is a lunar impact crater that is located to the northwest of Delambre crater, and south of D'Arrest crater. It forms a matching pair with the Theon Junior crater, about 2 crater diameters to the south-southeast. The satellite crater Theon Senior A can be found to the North. Theon Senior is named for Theon of Smyrna, a 1st century Greek mathematician and philosopher.[1][2]
This crater is circular and bowl-shaped, with only a small floor at the center of the steeply sloping interior walls. The crater appears relatively young, as it shows little sign of wear due to impacts. The crater is about 18 kilometers in diameter, and the distance from its rim to the floor is 3470 meters. Theon Senior is from the Eratosthenian period, which lasted from 3.2 to 1.1 billion years ago.[1][2]
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 Theon Senior crater.[3]
| Theon Senior |
Latitude | Longitude | Diameter |
|---|---|---|---|
| A | 0.2° S | 15.4° E | 5 km |
| B | 0.2° N | 14.1° E | 6 km |
| C | 1.4° S | 14.5° E | 6 km |
References
- ^ a b Autostar Suite Astronomer Edition. CD-ROM. Meade, April 2006.
- ^ a b Moore, Patrick (2001). On the Moon. Sterling Publishing Co.. ISBN 0-304-35469-4.
- ^ Bussey, B.; Spudis, P., (2004). The Clementine Atlas of the Moon. New York: Cambridge University Press. ISBN 0-521-81528-2.
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