Mars - Viking 1 Orbiter

Tharsis Tholus volcano, Mars

Viking 1 Orbiter image of Tharsis Tholus, Mars. The volcano is partially buried, the exposed portion measures 170 km in diameter. Note the wide bench in the lower left of the caldera, which may be the remnants of an ancient lava lake. North is at about 1:00 in the image, which is about 200 km wide. (Viking Orbiter 225A13)
Larger image: 216K

High resolution tiff file (1.0M)

Location & Time Information
Date/Time (UT): 1977-02-02 T 20:18:28
Distance/Range (km): 5468.1
Central Latitude/Longitude (deg): +13.21/92.08
Orbit(s): 225

Imaging Information
Area or Feature Type: Volcano, Caldera
Instrument: Visual Imaging Subsystem - Camera A
Instrument Resolution (pixels): 1056 x 1182, 7 bit
Instrument Field of View (deg): 1.54 x 1.69
Filter: Violet (3)
Illumination Incidence Angle (deg): 47.50
Phase Angle (deg): 91.05
Instrument Look Direction: N/A
Surface Emission Angle (deg): 47.46

Ordering Information
CD-ROM Volume: VO_1014
NASA Image ID number: 225A13
Other Image ID number: 30294828
NSSDC Data Set ID (Photo): 75-075A-01B
NSSDC Data Set ID (CD): 75-075A-01c
Other ID: N/A


[NASA Logo] Authors/Curators:

Dave Williams,, (301) 286-1258
Code 690.1, NASA Goddard Space Flight Center
Greenbelt, MD 20771, USA

Jay Friedlander,, (301) 286-7172
Code 612.4, NASA Goddard Space Flight Center
Greenbelt, MD 20771, USA

NASA Official: Dr. David R. Williams,

Last updated: 24 September 2015