Physical Models and Refined Orbits for Asteroids from Gaia Photometry and Astrometry

Details Physical Models and Refined Orbits for Asteroids from Gaia Photometry and Astrometry Physical Models and Refined Orbits for Asteroids from Gaia Photometry and Astrometry

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005esasp.576..301k&link_type=abstract

"Proceedings of the Gaia Symposium "The Three-Dimensional Universe with Gaia" (ESA SP-576). Held at the Observatoire de Paris-Me

Astronomy and Astrophysics

Astronomy

3

Gaia, Solar System, Minor Planets, Photometry, Astrometry, Numerical Methods

Scientific paper

Gaia will make accurate photometric and astrometric observations of thousands of asteroids in sparse epoch sequences. We show that sparse photometric data are usually sufficient for obtaining the sidereal period, the pole direction, and a coarse estimate of the global shape (or binary character) of the target. Some light-scattering characteristics (solar phase function for the Gaia phase angle range) are also obtained. Furthermore, we show that the photocentre offset effect of ultraprecise astrometry can be efficiently combined with photometric data sets to yield improved physical models of asteroids. This is done by solving the full inverse problem for the target's orbit, size, shape, spin state, and scattering properties. The shape and the spin state of the target are more accurate than from photometry alone, and the barycentre residuals for the orbit are considerably smaller than those from uncorrected (or crudely corrected) astrometric measurements. This scheme also removes the double-pole ambiguity of photometrically derived spin states of targets close to the plane of the ecliptic.

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