Gemma Frisius

A large, heavily degraded crater in the southern highlands, notable for the prominent crater Goodacre on its floor.

Visual Description

Gemma Frisius appeared as a large, ancient crater in the heavily cratered southern highlands. The crater showed significant degradation with worn walls and a floor marked by multiple later impacts. Most notably, the crater Goodacre occupied a prominent position on Gemma Frisius’s floor, creating a distinctive nested crater appearance. The overall structure demonstrated the great age of this formation and the intense bombardment history of the southern highlands.

Notable Features

• Large ancient crater, 88 km diameter
• Heavily degraded walls
• Crater Goodacre on floor
• Located in southern highlands
• Shows extensive impact history

Notes

• Named after Dutch mathematician Gemma Frisius
• Contains several floor craters
• Best observed 8-10 days after new moon
• Coordinates: 34.2°S, 13.3°E
• Typical of ancient highland craters