论文信息 - Imaging of Small-Scale Features on 433 Eros from NEAR: Evidence for a Complex Regolith

Imaging of Small-Scale Features on 433 Eros from NEAR: Evidence for a Complex Regolith

On 25 October 2000, the Near Earth Asteroid Rendevous (NEAR)–Shoemaker spacecraft executed a low-altitude flyover of asteroid 433 Eros, making it possible to image the surface at a resolution of about 1 meter per pixel. The images reveal an evolved surface distinguished by an abundance of ejecta blocks, a dearth of small craters, and smooth material infilling some topographic lows. The subdued appearance of craters of different diameters and the variety of blocks and different degrees of their burial suggest that ejecta from several impact events blanketed the region imaged at closest approach and led to the building up of a substantial and complex regolith consisting of fine materials and abundant meter-sized blocks.

[1] Patrick Michel,et al. Dynamics of Eros , 1998 .

[2] Robert E. Gold,et al. Inflight Calibration of the NEAR Multispectral Imager , 1999 .

[3] R. Greeley,et al. Discovery of Grooves on Gaspra , 1994 .

[4] A. McEwen,et al. Geology of 243 Ida , 1996 .

[5] J. Veverka,et al. Downslope movement of material on Deimos , 1980 .

[6] Veverka,et al. Imaging of asteroid 433 eros during NEAR's flyby reconnaissance , 1999, Science.

[7] Clark R. Chapman,et al. An overview of the NEAR multispectral imager-near-infrared spectrometer investigation , 1997 .

[8] R. Greeley,et al. Ejecta Blocks on 243 Ida and on Other Asteroids , 1996 .

[9] J. Veverka,et al. Grooves on asteroids: A prediction , 1979 .

[10] T. Gold. The Lunar Surface , 1955 .

[11] P. Lee. DUST LEVITATION ON ASTEROIDS , 1996 .

[12] S. Runcorn. Book Review: Impact and Explosion Cratering. Proceedings of the Symposium on Planetary Cratering Mechanics. Pergamon Press, 1977, 1299 pp., US $150.00, £98.00, ISBN 0-08-022050-9 , 1984 .

[13] Michael J. Elko,et al. Multi-Spectral Imager on the Near Earth Asteroid Rendezvous Mission , 1997 .

[14] Gerhard Neukum,et al. A study of lunar impact crater size-distributions , 1975 .