Near-Earth Asteroids Astrometry with Gaia and Beyond

Details Near-Earth Asteroids Astrometry with Gaia and Beyond Near-Earth Asteroids Astrometry with Gaia and Beyond

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010sf2a.conf..107b&link_type=abstract

SF2A-2010: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics. Eds.: S. Boissier, M. Heydari-

Astronomy and Astrophysics

Astrophysics

Gaia Mission, Neas, Apophis, Close Approach, B-Plane

Scientific paper

Potentially Hazardous Asteroids (PHAs) are Near-Earth Asteroids (NEAs) caraterised by a Minimum Orbital Intersection Distance (MOID) with Earth less than 0,05 A.U and an absolute magnitude H<22. Those objects have sometimes a so significant close approach with Earth that they can be put on a chaotic orbit. This kind of orbit is very sensitive for exemple to the initial conditions, to the planetary theory used (for instance JPL's model versus IMCCE's model) or evento the numerical integrator used (Lie Series, Bulirsch-Stoer or Radau). New observations (optical, radar, fly-by or satellite mission) can improve those orbits and reduce the uncertainties on the Keplerian elements. We investigate here, the impact of the Gaia astrometric observations on the asteroid Apophis's orbit.

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