Location of Hipparchus Crater
|Discoverer||Mariner 4 (1965)|
Hipparchus is an impact crater in the Phaethontis quadrangle of Mars, located at 44.8° S latitude and 151.4° W longitude. It is 93 kilometers (58 miles) in diameter and was named after the ancient Greek astronomer Hipparchus. The naming was approved by the IAU in 1973.
Nearby prominent craters include Eudoxus to the east, Li Fan to the west-southwest and Ptolemaeus further west, also further northwest is the larger Newton. Small channels dominate parts of the crater especially its rims.
There is enormous evidence that water once flowed in river valleys on Mars. Images of curved channels have been seen in images from Mars spacecraft dating back to the early seventies with the Mariner 9 orbiter. Indeed, a study published in June 2017, calculated that the volume of water needed to carve all the channels on Mars was even larger than the proposed ocean that the planet may have had. Water was probably recycled many times from the ocean to rainfall around Mars. Some of the pictures on this page show channels in Hipparchus Crater.
East side of Hipparchus, as seen by CTX camera (on Mars Reconnaissance Orbiter (MRO)