Billy (crater)

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.

Coordinates13.8°S 50.1°W / -13.8; -50.1

Diameter45 km

Depth1.2 km

Colongitude50° at sunrise

Quick facts Coordinates, Diameter ...

Billy

Lunar Orbiter 4 image (spots at upper right are blemishes on original)
Coordinates	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

Close

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.