Photometry and models of selected main belt asteroids^*,**

VII. 350 Ornamenta, 771 Libera, and 984 Gretia

¹ Astronomical Observatory, Adam Mickiewicz University, Słoneczna 36, 60-286 Poznań, Poland e-mail: aniab@lab.astro.amu.edu.pl
² Geneva Observatory, 1290 Sauverny, Switzerland
³ Les Engarouines Observatory, 84570 Mallemort-du-Comtat, France
⁴ IMCCE – Paris Observatory – UMR 8028 CNRS, 77 av. Denfert-Rochereau, 75014 Paris, France
⁵ Observatoire du Bois de Bardon, 16110 Taponnat, France
⁶ Association T60, 14 avenue Edouard Belin, 31400 Toulouse, France
⁷ Université de Rennes 1, Campus de Beaulieu, 35042 Rennes Cedex, France
⁸ Makes Observatory, 18 rue G. Bizet – Les Makes, 97421 La Rivière, France

Received: 22 June 2009
Accepted: 14 September 2009

Abstract

We analyze photometric observations of the three main-belt asteroids 350 Ornamenta, 771 Libera, and 984 Gretia, conducted over a twelve-year interval. Our data and those of other authors allow us to determine pole and shape models using the lightcurve inversion technique. In all three cases, a single pole solution was obtained without any significant mirror solution: Ornamenta –  h, , Libera –  h, , Gretia –  h, , . This analysis and the development of asteroid models increase the set of asteroids with known spin and shape parameters, which consists of only around 100 objects.