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Astron. Astrophys. 331, 1113-1118 (1998)

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Minor planets ephemerides improvement *

From joint analysis of Hipparcos and ground-based observations

D. Hestroffer 1, B. Viateau 2 and M. Rapaport 2

1 Astrophysics Division, Space Science Department of ESA, ESTEC, Postbus 299, 2200 AG Noordwijk, The Netherlands
2 Observatoire de l'Université de Bordeaux I, URA 352 BP 89, F-33270 Floirac, France

Received 14 October 1997 / Accepted 17 November 1997


Two methods are considered for the improvement of the ephemerides of the asteroids observed by the Hipparcos satellite. They utilize different combinations of ground-based and space-based data. In particular, we develop a method based on an analysis of the variance matrix in the least-squares solution of Hipparcos observations taken alone. Application and comparison of the results for (2) Pallas and (324) Bamberga are given. It is shown that one of the methods is less sensitive to the weighting of the equations of condition. This procedure can be applied to the improvement of the ephemerides of asteroids when the observational data consist of subsets of very different accuracies.

Key words: astrometry – celestial mechanics, stellar dynamics – ephemerides – minor planets, asteroids – planets and satellites: individual: (324) Bamberga, (2) Pallas

* Based on data from the Hipparcos astrometry satellite

Send offprint requests to: D. Hestroffer, dhestrof@estec.esa.nl


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© European Southern Observatory (ESO) 1998

Online publication: March 3, 1998