Direct Measurement of the Yarkovsky Effect Acting on Near-Earth Asteroid 1992 BF

Details Direct Measurement of the Yarkovsky Effect Acting on Near-Earth Asteroid 1992 BF Direct Measurement of the Yarkovsky Effect Acting on Near-Earth Asteroid 1992 BF

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006dps....38.5802c&link_type=abstract

American Astronomical Society, DPS meeting #38, #58.02; Bulletin of the American Astronomical Society, Vol. 38, p.591

Astronomy and Astrophysics

Astronomy

1

Scientific paper

1992 BF is an Aten-class near-Earth asteroid with absolute magnitude 19.7, which implies a diameter of roughly 400m. The object has been observed during five apparitions from discovery in 1992 through 2005. Precovery observations dating to Jan. 1953 (A. Lowe, MPS 56779, 2002) fit poorly with the modern observations using standard n-body orbit determination models. A careful examination of the archived 1953 images reveals that the orbital prediction based on the 1992-2005 data is significantly offset in a direction orthogonal to the 1953 trail, indicating that timing uncertainty is not the cause of the poor fit. However, including the Yarkovsky acceleration in the force model eliminates the observational discrepancy, and reveals a semimajor axis drift rate of -(10.7 ± 2) × 10-4 AU/My. This value indicates a retrograde spin state, with obliquity in the range 120-180 degrees. Additional observations of 1992 BF in 2011 could be used to constrain the shape, size and spin state, which, when combined with the Yarkovsky acceleration, would enable an estimate of the mass and bulk density of the object.

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