Electronic Telegram No. 1078 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://www.cfa.harvard.edu/iau/cbat.html (32008) 2000 HM53 P. Pravec, P. Kusnirak, and K. Hornoch, Ondrejov Observatory; J. Vilagi, L. Kornos, and A. Galad, Modra Observatory; D. Higgins, Canberra, Australia; V. Chiorny, Institute of Astronomy, Kharkiv National University, National Academy of Science of Ukraine; D. Pray, Carbuncle Hill Observatory, Greene, RI; R. Stephens, Goat Mountain Astronomical Research Station, Yucca Valley, CA; 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 Aug. 5-Sept. 14 reveal that minor planet (32008) is a binary system with an orbital period of 40.24 +/- 0.02 hr -- or, less likely, 20.12 +/- 0.01 hr. The primary shows a period of 3.0171 +/- 0.0001 hr, and it has a lightcurve amplitude of 0.19 mag. Mutual eclipse/occultation events indicate a lower limit on the secondary- to-primary mean-diameter ratio of 0.4. Calibrated data give an estimated mean absolute magnitude H_R = 14.17 +/- 0.1, assuming G = 0.15 +/- 0.2. NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2007 CBAT 2007 September 20 (CBET 1078) Daniel W. E. Green