Electronic Telegram No. 207
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


(76818) 2000 RG_79
     B. D. Warner, Colorado Springs, CO; P. Pravec, Ondrejov Observatory;
and D. Pray, Coventry, RI, report that photometric observations obtained
during Aug. 7-28 show that the minor planet (76818) is a binary
system with an orbital period of 14.125 +/- 0.01 hr.  The primary
rotates with a period 3.1664 +/- 0.0002 hr, and its lightcurve amplitude
of 0.14 mag is indicative of a nearly spheroid shape.  Mutual
eclipse/occultation events that are about 0.14 mag deep indicate a
secondary-to-primary mean-diameter ratio of 0.37 +/- 0.03.


NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
      superseded by text appearing later in the formal IAU Circulars.

                         (C) Copyright 2005 CBAT
2005 August 30                   (CBET 207)               Daniel W. E. Green