V. Reddy, Department of Space Studies, University of North Dakota, Grand Forks; R. Dyvig, Quinn, SD; and P. Pravec and P. Kusnirak, Ondrejov Observatory, report that photometric observations obtained during Feb. 1-8 show that the Amor-type minor planet 2005 AB (cf. MPEC 2005-A05, 2005-C48) is a binary system with orbital period 17.9 hr. The primary rotates with a period of 3.337 hr, and its lightcurve amplitude of 0.04 mag is indicative of a nearly spheroidal shape. Mutual events 0.06-0.11 mag deep indicate a secondary-to-primary mean-diameter ratio of 0.24 or greater. Further observations (especially radar and spectroscopic) are desirable.
International Astronomical Union Circular
- Pub Date:
- February 2005