EDP Sciences
Free Access
Volume 385, Number 2, April II 2002
Page(s) 686 - 692
Section Celestial mechanics and astrometry
DOI https://doi.org/10.1051/0004-6361:20020149

A&A 385, 686-692 (2002)
DOI: 10.1051/0004-6361:20020149

Precision and accuracy of the orbital parameters derived from 2D & 1D space observations of visual or astrometric binaries

D. Pourbaix

Institut d'Astronomie et d'Astrophysique, Université Libre de Bruxelles, CP 226, Boulevard du Triomphe, 1050 Bruxelles, Belgium

(Received 8 October 2001 / Accepted 9 January 2002)

Recent investigations (e.g. Han et al. 2001) have shown that fitting the Hipparcos observations with an orbital model when the astrometric wobble caused by the companion is below the noise level can have rather unexpected consequences. With new astrometric missions coming out within the next ten years, it is worth investigating the orbit reconstruction capabilities of such instruments at low signal-to-noise ratio. This is especially important because some of them will have no input catalogue, thus meaning that all the orbital parameters will have to be derived from scratch. The puzzling case of almost parabolic orbits is also investigated.

Key words: stars: binaries: general -- astrometry -- stars: binaries: close

SIMBAD Objects in preparation

© ESO 2002

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