Sinus Lunicus
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| Sinus Lunicus | |
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| Coordinates | 31.8° N, 1.4° W |
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| Diameter | 126 km |
| Eponym | Bay of Lunik |
Sinus Lunicus (latin for "Bay of Lunik") is an area of lunar mare along the southeast edge of the Mare Imbrium. It is formed by the area enclosed by the prominent craters Archimedes to the southwest, Autolycus to the southeast, and Aristillus to the northeast. The bay is open to the northwest, and faces the Montes Spitzbergen, a small chain of mountains.
This bay was named the Bay of Lunik by the International Astronomical Union (IAU) in 1970 to honor the landing site of the first space probe to make contact with another interplanetary body. The Luna 2 landed in the gap between the Archimedes and Autolycus craters on September 14, 1959.
The official selenographic coordinates of Sinus Lunicus are 31.8° N and 1.4° W, with a diameter of 126 kilometers. The most distinctive features on the bay are the complex outer ramparts of ejecta from Aristillus and Autolycus craters, and the small satellite craters 'Archimedes C' and 'Archimedes D'. The albedo of the surface is brightened by overlapping ray material from Autolycus and Aristillus.
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