Billy (crater)

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Billy (crater)
Billy crater 4149 h2.jpg
Lunar Orbiter 4 image
(spots at upper right are blemishes on original)
Coordinates 13°48′S 50°06′W / 13.8°S 50.1°W / -13.8; -50.1Coordinates: 13°48′S 50°06′W / 13.8°S 50.1°W / -13.8; -50.1
Diameter 45 km
Depth 1.2 km
Colongitude 50° at sunrise
Eponym Jacques de Billy

Billy is a lunar crater that is located at the southern fringes of the Oceanus Procellarum, in the western hemisphere of the Moon. It lies to the southeast of the similar-sized crater Hansteen, and west-southwest of the flooded Letronne.

The interior floor of Billy has been flooded by basaltic lava, leaving a dark surface due to the low albedo. The portion of the rim remaining above the surface is narrow and low, with a thin inner wall. Only a few tiny craterlets mark the interior.

To the north of the crater is a triangular mountainous formation named Mons Hansteen, from the nearby crater. Southeast of Billy is a rille, designated Rima Billy, that runs 70 kilometers to the south.

Satellite craters[edit]

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

Billy Latitude Longitude Diameter
A 14.3° S 46.3° W 7 km
B 12.2° S 47.6° W 25 km
C 16.1° S 49.0° W 6 km
D 14.9° S 48.3° W 11 km
E 15.0° S 49.6° W 2 km
H 15.6° S 49.6° W 3 km
K 12.9° S 48.7° W 4 km

References[edit]

External links[edit]