&sq=Qlik&lang=&file=File: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 |
|---|---|
| Diameter | 45 km |
| Depth | 1.2 km |
| Colongitude | 50° at sunrise |
| Eponym | Jacques de Billy |
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Billy is a lunar impact crater that is located at the southern fringes of the Oceanus Procellarum, in the western hemisphere of the Moon. It was named after French mathematician Jacques de Billy.[1] 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.
- ^ "Billy (crater)". Gazetteer of Planetary Nomenclature. USGS Astrogeology Research Program.