Physical studies of asteroids

XXXII. Rotation periods and UBVRI-colours for selected asteroids

¹ Astronomiska observatoriet, Box 515, S–75120 Uppsala, Sweden
² Observatory, University of Helsinki, P.O. Box 14, FIN–00014 University of Helsinki, Finland
³ DLR, German Aerospace Research Establishment, Rudower Chausse 5, D-12489 Berlin, Germany
⁴ Max-Planck-Institut für Kernphysik, Postfach 103980, D-69029 Heidelberg, Germany
⁵ Astronomical Observatory, Kharkiv University, Sumskaya str. 35, 310022 Kharkiv, Ukraine

Send offprint request to: J. Piironen Partly based on observations from the European Southern Observatory, La Silla, Chile.

Received: 15 May 1997
Accepted: 26 August 1997

Abstract


We present lightcurves of selected asteroids. Most of the asteroids were included to obtain refined spin periods. Enhanced periods were determined for 11 Parthenope, 306 Unitas and 372 Palma. We confirmed the spin periods of 8 Flora, 13 Egeria, 71 Niobe, 233 Asterope, 291 Alice, 409 Aspasia, 435 Ella and 512 Taurinensis. We determined also BV-colours for most of the included asteroids and UBVRI-colours for a total of 22 asteroids.