Tags: Crater.
Ptolemaeus Crater is a crater on Mars found in the Phaethontis quadrangle at 46.21° south latitude and 157.6° west longitude. It is 165.18 km in diameter and was named after Claudius Ptolemaeus a Greco-Egyptian astronomer (c. AD 90-160). The Soviet probe Mars 3 is thought to have successfully landed in Ptolemaeus Crater in 1971 but contact was lost seconds after landing.
