Abstract

The improved resolution of the Viking images has led to the discovery of a number of unusual surface features on Phobos. The features include elongated rill-like depressions associated with the crater Stickney, chains and clusters of irregular elongated craters, and linear striations or grooves. Crater counts are also considered. A total of 27 craters ranging in size from 0.3 to 1.4 km are visible on the best Deimos frame available. Craters ranging from 50 m to 4.9 km in diameter can be observed on the best of the Phobos images.

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