[IAUC] CBET 1078: 20070920 : (32008) 2000 HM53

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                                                  Electronic Telegram No. 1078
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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CBAT en CFA.HARVARD.EDU (science)
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(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.


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                         (C) Copyright 2007 CBAT
2007 September 20                (CBET 1078)              Daniel W. E. Green