Scale: 1 pixel = 5000 meters. 10-degree grid; Lambert Conformal Conic Projection, Center 40N 180EW
The topographic map is derived from a monochrome NASA Geotiff map.
As lovely as the Caloris Basin is on the 1973 Mariner 10 pictures, it's not very conspicuous on these maps. Mariner 10 made one orbit for every two revolutions of Mercury, and three rotations. Thus it made three flawless passes past the same hemisphere of Mercury. While it brilliantly confirmed that Mercury has a tidal lock on the Sun, it left one hemisphere completely unmapped until MESSENGER returned in 2011.
The Caloris Basin showed up in the low-illumination Mariner 10 images mostly because of wrinkle ridges and fractures in the maria-like filling of the basin. In terms of size relative to its parent body, Caloris is comparable to Mare Imbrium on the Moon but las much less conspicuous mountain rims.
Created 27 January 2015, Last Update
09 June 2017
Not an official UW Green Bay site