Phobos - Viking 2 Orbiter

Martian moon Phobos over Ascraeus Mons

Viking 2 Orbiter image of Phobos orbiting over Ascraeus Mons on Mars. Phobos is about 8000 km below the spacecraft and 22 km across. Ascraeus Mons is 13,000 km away and about 300 km at its base, centered at 11 N, 104 W. North is at 11:30, and Phobos is moving from left to right relative to the surface. (Viking Orbiter 304B88)
Larger image: 456K

High resolution tiff file (1.0M)

Location & Time Information
Date/Time (UT): 1977-06-23 T 11:17:04
Distance/Range (km): 8000 km
Central Latitude/Longitude (deg): N/A
Orbit(s): 304

Imaging Information
Area or Feature Type: global; view, volcano
Instrument: Visual Imaging Subsystem - Camera B
Instrument Resolution (pixels): 1056 x 1182, 7 bit
Instrument Field of View (deg): 1.54 x 1.69
Filter: clear (4)
Illumination Incidence Angle (deg): N/A
Phase Angle (deg): N/A
Instrument Look Direction: N/A
Surface Emission Angle (deg): N/A

Ordering Information
CD-ROM Volume: VO_1056
NASA Image ID number: 304B88
Other Image ID number: 52653629
NSSDC Data Set ID (Photo): 75-083A-01F
NSSDC Data Set ID (CD): 75-083A-01a
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: Ed Grayzeck,

Last updated: 24 September 2015