Billy

A crater in the southwestern nearside, paired with crater Hansteen, notable for its dark, lava-flooded floor.

Visual Description

Billy appeared as a moderate-sized crater with a distinctly dark floor, indicating partial flooding by lava flows. The crater was located southwest of Oceanus Procellarum in a region with several similar dark-floored craters. Billy was immediately adjacent to the crater Hansteen, forming a prominent pair. The dark floor contrasted with the brighter surrounding highlands and crater rim, making it easily identifiable.

Notable Features

• Dark, lava-flooded floor
• Paired with crater Hansteen
• Located southwest of Oceanus Procellarum
• Moderate size with distinct appearance
• Sharp contrast between floor and rim

Notes

• Named after French mathematician Jacques de Billy
• Excellent example of volcanic flooding
• Best observed 11-13 days after new moon
• Coordinates: 13.8°S, 50.1°W
• Part of region with several dark-floored craters