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Il Viking 1 aveva fatto immagini ad alta risoluzione.

Phobos - Viking 1 Orbiter

 

Hall crater on the Martian satellite, Phobos

Viking 1 Orbiter image of Hall crater on Phobos. The crater, at the lower right, is 6 km in diameter and centered at 75 S. 225 W. Just to the lower right of the crater is Phobos' south pole. The image is about 16 km across. (Viking Orbiter 252A63)
Larger image: High resolution tiff file (1.0 Mb)

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Location & Time Information
Date/Time (UT): 1977-02-28 T 16:54:00
Distance/Range (km): 606.1
Central Latitude/Longitude (deg): -50.,240. W
Orbit(s): 252
Imaging Information
Area or Feature Type: crater, pole
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: clear (4)
Illumination Incidence Angle (deg): N/A
Phase Angle (deg): 10.
Instrument Look Direction: N/A
Surface Emission Angle (deg): N/A
Ordering Information
CD-ROM Volume: VO_1014
NASA Image ID number: 252A63
Other Image ID number: 30793518
NSSDC Data Set ID (Photo): 75-075A-01B
NSSDC Data Set ID (CD): 75-075A-01c
Other ID: N/A

Updated 20 May 2003, DRW.