1 Introduction

Photometric observations provide the most aboundant data for determinations of rotational periods, orientations of spin vectors, and physical properties of surfaces of asteroids. The photometric database consists of the lightcurves of more than 700 asteroids, but spin vectors have been determined for only about 100 of them. Magnusson et al. (1989) provided a review of all techniques used in order to obtain poles and shapes of asteroids. One approach to obtain this information is to study the brightness variation af asteroids as they spin about their axes. Such a method, described by Michaowski (1993), has been used in the present work.

The present paper is a part of a programme devoted to enlarging the number of asteroids with known physical parameters. The new photometric observations presented here, combined with previously published ones, have been used to determine sidereal periods, coordinates of poles and triaxial ellipsoid models for the observed asteroids. These new models will be included into the existing database of spin parameters and used for statistical investigation of the evolution history of the asteroid main belt. The most extensive spin and shape database is the one compiled by Per Magnusson, which can be found in The Small Bodies Node of the NASA Planetary Data System (http://pdssbn.astro.umd.edu/).