|Lat: 20.4°S, Long: 121.5°E, Diam: 20 km, Depth: km, Rükl: (farside)|
(Left) Annotated from AS15-M-1035(larger printable version). Note, west is top, north is right in these linked images. (Right) Color-coded LAC 101 from USGS Digital Atlas of the Moon
Diderot lies in the 183 km diameter-wide, pre-Nectarian crater (~ 4.6 to 3.92 bn years) Fermi. Unlike similar-sized (20 km) Babakin crater just to its right, Diderot's worn-looking rim is barely perceptable. Most, if not all, of its north-eastern portion has either collapsed into its floor or has been affected in some way by impact ejecta from mare-filled Tsiolkovskiy nearby -- a 185 km diameter crater of the Late Imbrium (3.8 - 3.2 bn years) period and out of picture to the east. - JohnMoore2
Denis; French philosopher (1713-1784).