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Science 15 May 1970:
Vol. 168. no. 3933, pp. 828 - 830
DOI: 10.1126/science.168.3933.828
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Articles

Phobos: Preliminary Results from Mariner 7

Bradford A. Smith 1

1 The Observatory, New Mexico State University, Las Cruces 88001

Analysis of an image of Phobos on Mariner 7 frame 7F91 indicates that the martian satellite is larger and has a darker surface than had previously been thought. The limb profile measures 18 by 22 kilometers and is elongated along the orbital plane. Phobos has an average visual geometric albedo of 0.065 lower than that known for any other body in the solar system. It seems probable that Phobos did not form by accretion around primordial Mars, but was captured at some later time.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Phobos Transit of Mars as Viewed by the Viking Cameras.
T. C. Duxbury and T. C. DUXBURY (1978)
Science 199, 1201-1202
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