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Astron. Astrophys. 323, L53-L56 (1997)

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Letter to the Editor

Double star data in the Hipparcos Catalogue *

L. Lindegren 1, F. Mignard 2, S. Söderhjelm 1, M. Badiali 3, H.H. Bernstein 4, P. Lampens 5, R. Pannunzio 6, F. Arenou 7, P.L. Bernacca 8, J.L. Falin 2, M. Froeschlé 2, J. Kovalevsky 2, C. Martin 2, M.A.C. Perryman 9 and R. Wielen 4

1 Lund Observatory, Box 43, S-22100 Lund, Sweden
2 Observatoire de Côte d'Azur, CERGA, Avenue Copernic, F-06130 Grasse, France
3 Instituto di Astrofisica Spaziale, CNR, Via E. Fermi 21, Frascati, Italy
4 Astronomisches Rechen-Institut, Mönchhofstrasse 12-14, D-69120 Heidelberg, Germany
5 Koninklijke Sterrenwacht van Belgie, Ringlaan 3, B-1180 Brussel, Belgium
6 Osservatorio Astronomico di Torino, I-10025 Pino Torinese (TO), Italy
7 Section d'Astrophysique, Observatoire de Paris, F-92195 Meudon Cedex, France
8 Astrophysical Observatory, via dell'Osservatorio, I-36102 Asiago (VI), Italy
9 Astrophysics Division, European Space Agency, ESTEC, Noordwijk 2200AG, The Netherlands

Received 29 April 1997 / Accepted 1 May 1997


The Hipparcos Catalogue contains astrometric results for 117 955 catalogue entries, many of which are in reality double or multiple stars. For 17 917 entries special solutions were made in order to cope with the various manifestations of multiplicity, and 6763 other entries were flagged as suspected binaries but solved as single stars. Details of the special solutions are contained in the Hipparcos Catalogue Double and Multiple Systems Annex, divided in five parts according to the type of solution: resolved systems (13 211 entries with a total of 24 588 components), astrometric binaries with curved proper motion (2622 entries) or orbital solutions (235 entries), `variability-induced movers' (288 entries) and `stochastic' solutions (1561 entries). Trigonometric parallaxes and the positions and proper motions in the extragalactic reference system ICRS are provided for all entries.

Key words: Hipparcos – astrometry – double stars – catalogues

* Based on observations made with the ESA Hipparcos astrometry satellite

Send offprint requests to: L. Lindegren

© European Southern Observatory (ESO) 1997

Online publication: June 5, 1998