Location of Photo:
Cattle Point, Victoria, BC, Canada
Date/Time of photo:
22 Jan 21
12" Meade LX200GPS, ZWO ASI178MM, Astronomik 642 filter
We come to the northernmost crater in the Ptolemaeus Chain, Ptolemaeus (154 km) itself. A grand walled plain, Ptolemaeus is probably the oldest of the three craters in the chain. Its walls are heavily eroded and worn. It contains a wealth of little craters, along with the prominent crater Ammonius (9 km) northeast of centre. The crater to the north of Ptolemaeus is Herschel (41 km), a bowl-shaped crater with steep slopes. West of Ptolemaeus, you can see Catena Davy, a string of craterlets, and to the east another string of craterlets, but unnamed.