English: Magellan radar image of Balch Crater, Venus, originally designated Somerville Crater. This crater is one of the few examples of tectonically modified craters seen on Venus. The absence of such craters indicates a possible cessation of tectonic deformation on Venus at some point in history. Balch is located at 30° N, 283° W in Devana Chasma, Central Beta Regio. The crater was originally 37 kilometres in diameter. North is up. (Magellan C1-MIDR 30N279;1,framelet 30)

Location & Time Information
Date/Time (UT): N/A
Distance/Range (km): 479.4
Central Latitude/Longitude (deg): +29.95/279.43
Orbit(s): 1859-1969

Imaging Information
Area or Feature Type: Crater, Rift
Instrument: Synthetic Aperture Radar
Instrument Resolution (pixels): 240 x 240, 8 bit
Instrument Field of View (deg): 2.1 x 2.5
Filter: N/A
Illumination Incidence Angle (deg): 39.1-44.4
Phase Angle (deg): 0
Instrument Look Direction: Left
Surface Emission Angle (deg): 39.1-44.4

Ordering Information
CD-ROM Volume: MG_0043
NASA Image ID number: C1-30N279;1
Other Image ID number: P-38741
NSSDC Data Set ID (Photo): 89-033B-01O
NSSDC Data Set ID (CD): 89-033B-01C
Other ID: N/A