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UNDERSTANDING REGOLITH DISTRIBUTION ON 433 EROS USING ANALYSES OF PIT CHAINS AND GROOVES

Introduction: From 2000 to 2001 the Near-Earth Asteroid Rendezvous NEAR-Shoemaker spacecraft orbited the asteroid 433Eros. Tens of thousands of high resolution images were collected in that year by the NEAR Multi-Spectral Imager (MSI). These images revealed that Eros is criss-crossed by hundreds of lineations, including both extensional and contractional features. A global database of all Eros lineaments has been created to better understand the global distribution of these features [1]. Extensional lineations provide additional clues to the underlying structure of the asteroid and the spatial distribution of regolith thickness. Extensional lineations range from pits to grooves to fractures; this range of morphologies is likely a function of underlying fracture dilation, regolith thickness, and the mechanical properties of the regolith. Grooves and pit chains have been identified on Eros [2] (Fig. 1), as well as other small bodies such as Phobos [3], Gaspra [4], and Ida [5]. Grooves and pit chains on Eros have been interpreted to form by collapse of surface regolith into underlying fractures [3, 4], consistent with hypotheses