The Morphology of Phobos and Deimos PDF Download

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The Morphology of Phobos and Deimos

The Morphology of Phobos and Deimos PDF Author: Peter Chew Thomas
Publisher:
ISBN:
Category : Deimos
Languages : en
Pages : 590

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Book Description
Imagery from Mariner 9 and the Viking Orbiter was used to study the surface features of Phobos and Deimos. The high density of the impact craters shows that the surfaces are generally more than one billion years old, and may be three times that age. Most of the debris ejected from impact craters on Phobos is permanently lost from the satellite because of its low gravity and proximity to Mars. Deimos retains more of its cratering debris. Both satellites have large blocks among their retained ejecta. The grooves on Phobos are surface expressions, in a loose regolith, of deeper fractures that were formed or widened by the impact that created the Stickney crater. The grooves diminish in size and number away from Stickney and they are absent in the area opposite that crater. Deimos lacks grooves, perhaps because of a difference in cratering history or in the mechanical properties of the two satellites.