CCD Photometry and a Model of the Asteroid 1572 Posnania

Michalowski T.(1), Borczyk W.(1), Kwiatkowski T.(1), Kryszczynska A.(1), Pretka H.(1), Pych W.(2), Wisniewski W.(3), Colas F.(4), Berthier J.(4), Pravec P.(5) Erikson A.(6), Nathues A.(6)

(1) Poznan Astronomical Observatory, A. Mickiewicz University, Poznan, Poland
(2) Warsaw University Astronomical Observatory, Warsaw, Poland
(3) Lunar and Planetary Laboratory, Tucson, USA
(4) Bureau des Longitudes, Paris, France
(5) Astronomical Institute, Ondrejov, Czech Republic
(6) DLR, Berlin, Germany

Asteroid 1572 Posnania was observed at five observatories (Ondrejov, Czech Republic; Ostrowik, Poland; Mt. Lemmon, Arizona; Pic du Midi, France; ESO, Chile) during 16 nights in three oppositions: 1993, 1994/95 and 1996. A synodical period of 8.048 hours have been found. Using all available lightcurves, the pole and triaxial ellipsoid model have been determined.