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D 15 km 253 mathilde c type 66 x 48 x 46 km large many

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Unformatted text preview: itions of planetary formation in the Early Solar System. Asteroids: Geology Asteroids: Geology 4 asteroids visited up close by spacecraft 951 Gaspra: Galileo flyby in 1991 243 Ida: Galileo flyby in 1993 253 Mathilde: NEAR flyby in 1997 433 Eros: NEAR orbital mission in 2000­2001 Also: Spacecraft images of Martian moons Phobos and Deimos: captured asteroids? Abundant evidence for impacts, and surprising evidence for erosion and tectonism on these small bodies 951 Gaspra S Type 16 x 11 x 10 km 243 Ida S Type 60 x 25 x 19 km Dactyl Ida's moon! D = 1.5 km 253 Mathilde C Type 66 x 48 x 46 km (large!) Many large craters Density only 1.3 g/cm3 May be 50% "empty" 433 Eros (2 views) S Type 31 x 13 x 13 km Many large craters Density about 2.6 g/cm3 433 EROS As seen by the NEAR (NearEarth Asteroid Rendezvous) Spacecraft. Tectonics: Eros may have been compressed and possibly even twisted during its history... Last image from NEAR before its landing: very fine-grained regolith. Rock is ~4m across Fine-grained regolith appears to be moving downhill on Eros: erosion. The Dawn Mission • Launched in 2007 • Arrives at Vesta in Octob...
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