[IAUC] CBET 1339: 20080415 : (5481) KIUCHI

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                                                  Electronic Telegram No. 1339
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS en CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT en CFA.HARVARD.EDU (science)
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(5481) KIUCHI
     P. Kusnirak and P. Pravec, Ondrejov Observatory; J. Oey, Leura, N.S.W.,
Australia; R. Stephens, Goat Mountain Astronomical Research Station, Yucca
Valley, CA, U.S.A.; M. Husarik, Skalnate Pleso Observatory; and J. Ries,
McDonald Observatory, report that photometric observations obtained during
Mar. 13 to Apr. 6 reveal that minor planet (5481) is a binary system with an
orbital period of 20.90 +/- 0.01 hr.  The primary shows a period of 3.6196
+/- 0.0002 hr, and it has a lightcurve amplitude of 0.10 mag, suggesting a
nearly spheroidal shape.  Mutual eclipse/occultation events indicate a
secondary-to-primary mean-diameter ratio of 0.33 +/- 0.02.  The mean
absolute R magnitude is H = 12.98 +/- 0.1, assuming G = 0.15 +/- 0.2.


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                         (C) Copyright 2008 CBAT
2008 April 15                    (CBET 1339)              Daniel W. E. Green