EDP Sciences
Free access
Volume 423, Number 3, September I 2004
Page(s) 1159 - 1168
Section Planets and planetary systems
DOI http://dx.doi.org/10.1051/0004-6361:20040449

A&A 423, 1159-1168 (2004)
DOI: 10.1051/0004-6361:20040449

Eclipsing binary asteroid 90 Antiope

T. Michalowski1, P. Bartczak1, F. P. Velichko2, 3, A. Kryszczynska1, T. Kwiatkowski1, S. Breiter1, F. Colas4, S. Fauvaud5, A. Marciniak1, J. Michalowski6, R. Hirsch1, R. Behrend7, L. Bernasconi8, C. Rinner9 and S. Charbonnel10

1  Astronomical Observatory, Adam Mickiewicz University, Sloneczna 36, 60-286 Poznan, Poland
    e-mail: tmich@amu.edu.pl
2  Research Institute of Astronomy, Kharkiv Karazin National University, Sums'ka 35, 61022 Kharkiv, Ukraine
3  Isaac Newton Institute of Chile, Crimean Branch, Chile
4  Institut de Mécanique Céleste, 77 Av. Denfert Rochereau, 75014 Paris, France
5  Astroqueyras Association, Mairie, 05350 Saint Veran, France
6  Poznan University of Technology, Poznan, Poland
7  Geneva Observatory, 1290 Sauverny, Switzerland
8  Les Engarouines Observatory, France
9  Ottmarsheim Observatory, France
10  Durtal Observatory, France

(Received 16 March 2004 / Accepted 11 May 2004)

CCD observations of the binary asteroid 90 Antiope were carried out at seven observatories (Borowiec, Kharkiv, Pic du Midi, Chateau Renard, Les Engarouines, Ottmarsheim, and Durtal) on 31 nights from December 2002 through April 2003. The results show two-component lightcurves with each showing the same period of $16.505 \pm 0.002$ h. The first component is associated with the rotation of the two non-spherical bodies of the system; the second one is due to eclipses/occultations in the binary system. The lightcurves suggest that Antiope is an 'almost synchronous system' with orbital period of $16.5051 \pm 0.0002$ h and a little shorter rotational one of $16.5047 \pm 0.0002$ h. The ecliptic coordinates of the pole of the orbit system are $\lambda_{n} = 17\degr \pm 5\degr$ and $\beta_{n} = 25\degr \pm 5\degr$. A possibility of the observation of the eclipsing events during two future oppositions (April 2004 and July 2005) has been predicted.

Key words: minor planets, asteroids

© ESO 2004