Asteroidal Occultation Silhouettes Combined with Asteroid Models Derived by Lightcurve Inversion

Details Asteroidal Occultation Silhouettes Combined with Asteroid Models Derived by Lightcurve Inversion Asteroidal Occultation Silhouettes Combined with Asteroid Models Derived by Lightcurve Inversion

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010dps....42.3916d&link_type=abstract

American Astronomical Society, DPS meeting #42, #39.16; Bulletin of the American Astronomical Society, Vol. 42, p.1035

Astronomy and Astrophysics

Astronomy

Scientific paper

Asteroid sizes can be directly measured by observing occultations of stars by asteroids. When there are enough observations across the path of the shadow, the asteroid's projected silhouette can be reconstructed. We present our analysis of occultation data we combined with convex asteroid models. Asteroid shape models derived from photometry by the lightcurve inversion method enabled us to compute the orientation of an asteroid for the time of occultation. By scaling the shape models to fit the occultation chords, we determined the asteroid sizes with a relative accuracy of typically 10%. We combined shape and spin state models of 44 asteroids (14 of them were new or updated models) with the available occultation data to derive asteroid effective diameters. In many cases, occultations allowed us to reject one of two possible pole solutions that were derived from photometry. Our results demonstrate the possibility of deriving unique physical models of asteroids by combining shape models obtained from lightcurve inversion with occultation timings.

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