[Mars' satellite Phobos]
Image Not Available

[Mars' satellite Phobos]

Image Not Available
Photograph

[Mars' satellite Phobos]

July 25, 1976
Gelatin silver print
Image: 19 x 24.1 cm
Overall: 20.2 x 25.3 cm
Museum accession
2011.0100.0005
Inscriptions verso (applied label, typed): NATIONAL AERONATICS AND SPACE ADMINISTRATION/ VIKING NEWS CENTER/ PASADENA, CALIFORNIA/ (213) 354-6000/
PHOTO CAPTION/
Viking 1-58/ P-17181/ July 27, 1976/
This is the first Viking Orbiter 1 picture of Phobos showing a/ heavily cratered side of the Mars satellite that was not viewed/ by Mariner 9. North is at the top of the picture while the point on Phobos which always points toward Mars is at the lower left/ portion of the image. The large crater near the North pole is/ approximately 5 kilometers (3 miles) across while craters as/ small as a few hundred meters can be seen. The diameter of Phobos/ when viewed from this angle is about 22 kilometers (14miles),/ and only about one-half of the surface of Phobos facing the camera/ was illuminated. This picture was taken on July 25.
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