Electronic Telegram No. 792 Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A. IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions) CBAT@CFA.HARVARD.EDU (science) URL http://cfa-www.harvard.edu/iau/cbat.html (3073) KURSK P. Kusnirak and P. Pravec, Ondrejov Observatory; S. Gajdos and A. Galad, Modra Observatory; W. Cooney, J. Gross, and D. Terrell, Sonoita Research Observatory, Sonoita, AZ; D. Pray, Carbuncle Hill Observatory, Greene, RI; F. Colas and J. Lecacheux, Pic du Midi Observatory; V. Reddy, Department of Earth System Science and Policy, University of North Dakota, Grand Forks; and R. Dyvig, Quinn, SD, report that photometric observations obtained during 2006 Dec. 11-27 reveal that minor planet (3073) is a binary system with an orbital period of 44.96 +/- 0.02 hr. The primary shows a period of 3.4468 +/- 0.0001 hr, and it has a lightcurve amplitude of 0.21 mag. Mutual eclipse/occultation events that are 0.06- to 0.07-mag deep indicate a secondary-to-primary mean-diameter ratio of 0.25 +/- 0.02. NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2007 CBAT 2007 January 3 (CBET 792) Daniel W. E. Green