Constraining multiple systems with GAIA

Details Constraining multiple systems with GAIA Constraining multiple systems with GAIA

2012-04-26

arxiv.org/abs/1204.5947v1

Astronomy and Astrophysics

Astrophysics

Earth and Planetary Astrophysics

5 pages, accepted by Planetary and Space Science, Gaia GREAT-SSO-Pise

Scientific paper

10.1016/j.pss.2012.01.006

GAIA will provide observations of some multiple asteroid and dwarf systems. These observations are a way to determine and improve the quantification of dynamical parameters, such as the masses and the gravity fields, in these multiple systems. Here we investigate this problem in the cases of Pluto's and Eugenia's system. We simulate observations reproducing an approximate planning of the GAIA observations for both systems, as well as the New Horizons observations of Pluto. We have developed a numerical model reproducing the specific behavior of multiple asteroid system around the Sun and fit it to the simulated observations using least-square method, giving the uncertainties on the fitted parameters. We found that GAIA will improve significantly the precision of Pluto's and Charon's mass, as well as Petit Prince's orbital elements and Eugenia's polar oblateness.

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