Electronic Telegram No. 1087
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)
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(10208) 1997 QN1
     J. Oey, Leura, N.S.W., Australia; P. Pravec and P. Kusnirak, Ondrejov
Observatory; Yu. Krugly and V. Chiorny, Institute of Astronomy of Kharkiv
National University, Main Astronomical Observatory, National Academy of
Science of Ukraine; and J. Ries, McDonald Observatory, report that
photometric observations obtained during Aug. 6-Sept. 18 reveal that minor
planet (10208) is a binary system with an orbital period of 58.55 +/- 0.02
hr.  The primary shows a period of 3.3484 +/- 0.0001 hr, and it has a light-
curve amplitude of 0.13 mag.  Mutual eclipse/occultation events, with a depth
of 0.21 mag on Sept. 15, indicate a secondary-to-primary mean-diameter ratio
of 0.46 +/- 0.02.  Calibrated data give an estimated mean absolute magnitude
H_R = 14.2 +/- 0.2, assuming G = 0.15 +/- 0.2.


NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
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                         (C) Copyright 2007 CBAT
2007 September 25                (CBET 1087)              Daniel W. E. Green