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

Abstract

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.

6 pages, 7 figures, accepted by A&A

References in corpus (3)

• The Hipparcos observations and the mass of sub-stellar objects
• Screening the Hipparcos-based astrometric orbits of sub-stellar objects
• Detection and measurement of planetary systems with GAIA

Cited by in corpus (8)

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• Double-blind test program for astrometric planet detection with Gaia
• Astrometric Methods and Instrumentation to Identify and Characterize Extrasolar Planets: A Review
• Circumstellar Habitable Zones of Binary Star Systems in the Solar Neighborhood
• Mass estimates for visual binaries with incomplete orbits
• Detectability of Earth-like Planets in Circumstellar Habitable Zones of Binary Star Systems with Sun-like Components
• The Effects of Multiple Companions on the Efficiency of the SIM Planet Searches
• Analysing weak orbital signals in Gaia data