Astronomy and Astrophysics – Astronomy
Scientific paper
May 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982esasp.177..169s&link_type=abstract
In ESA The Sci. Aspects of the Hipparcos Space Astrometry Mission p 169-171 (SEE N82-30146 20-88)
Astronomy and Astrophysics
Astronomy
Asteroids, Astrometry, Esa Satellites, Satellite Observation, Light Curve, Natural Satellites, Stellar Occultation, Taxonomy
Scientific paper
Evidence as to the binary nature of certain asteroids is adduced and the use of Hipparcos to acquire data on asteroids and their satellites is proposed. Analysis of occultations, e.g., of the bright star SA0 120774 by asteroid 532 Herculina, indicates the presence of asteroid satellites, but occultation measurement accuracy is low. The striking similarity of light curves, e.g., of 44 Nysa with contact binary light curves of W YUrsae Majoris, suggests a binary nature of asteroids. Hipparcos can observe asteroids of 100 Km dia, at a distance of 2 to 3 AU. This corresponds to 0.05 arcsec apparent diameter, with the second binary component at a distance from 0.1 to 1.0 arcsec. If geometrical configurations are known in advance, masses and densities can be derived from rotation rates and absolute distances within binary systems observed by Hipparcos.
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