Other
Scientific paper
Oct 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007dps....39.5003g&link_type=abstract
American Astronomical Society, DPS meeting #39, #50.03; Bulletin of the American Astronomical Society, Vol. 39, p.512
Other
Scientific paper
Arecibo Doppler measurements (2380-MHz, 12.6-cm) of asteroid 99942 Apophis, obtained in August 2005 and May 2006, have been combined with optical astrometry reported through August 2006 to produce a new orbit solution. This has reduced the volume of the uncertainty ellipsoid entering the April 13, 2029 Earth encounter an additional 87% relative to knowledge available after the initial delay-Doppler measurements in January of 2005. Apophis is predicted to encounter the Earth at a minimum geocentric distance within the interval [5.62,6.30] Earth-radii, considering both astrometric and physical parameter uncertainties. No statistically significant deviation from the Standard Dynamical Model is apparent in the reported astrometry. However, such deviations are expected in the future as a result of at least solar energy related accelerations, among other factors. Depending on their magnitude, such factors will affect trajectory prediction, hazard assessment, and mitigation feasibility not only for Apophis' potential encounter with Earth in 2036, but for a growing number of objects, as new surveys increase the rate of discovery.
Benner Lance A.
Busch Michael W.
Giorgini Jon D.
Nolan Michael C.
Ostro Steven J.
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