Shape of Asteroid 433 Eros from Inversion of Goldstone Radar Doppler Spectra

Details Shape of Asteroid 433 Eros from Inversion of Goldstone Radar Doppler Spectra Shape of Asteroid 433 Eros from Inversion of Goldstone Radar Doppler Spectra

Sep 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996dps....28.1047m&link_type=abstract

American Astronomical Society, DPS meeting #28, #10.47; Bulletin of the American Astronomical Society, Vol. 28, p.1106

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Taking advantage of new analysis techniques (Hudson, Remote Sensing Rev. 8, 195, 1993), we invert Goldstone radar data obtained during Eros' close approach in 1975 (Jurgens and Goldstein, Icarus 28, 1, 1976) to constrain the asteroid's shape. Our non-axisymmetric shape models are forced to be in principal-axis rotation and are thus suitable for realistic studies of orbital dynamics close to the asteroid. Two different modeling approaches yield distinct shapes. Both models have one or more prominent concavities on one side but not the other. The pole-on silhouette of Model 2 (see figure) is shaped like a kidney bean, which resembles a nearly pole-on optical image derived from speckle interferometry (Drummond and Hege, Asteroids II, 171, 1989); however, the uncertainties probably are large enough that we cannot exclude shapes with more than one large concavity (Model 1). Silhouettes of Models 1 and 2 as seen from above the south pole. The vertical extent of each bounding box is 40 km. Variations in the pyroxene/olivine ratio over Eros' surface have been inferred from visual and infrared observations (Murchie and Pieters, JGR 101, 2201, 1996). Correlating these variations with our shape information, we find that the side with concavities is relatively px-rich compared with the more rounded opposing side. \centering http://echo.jpl.nasa.gov/asteroids/433_Eros/preprint.html

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