Electronic Telegram No. 341
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


(34706) 2001 OP_83
     B. D. Warner, Palmer Divide Observatory, Colorado Springs;
D. Pray, Greene, RI; P. Pravec, Ondrejov Observatory; and W.
Cooney, Jr., J. Gross, and D. Terrell, Sonoita Research Observatory,
Sonoita, AZ, report that photometric observations obtained during
Dec. 11-28 reveal that (34706) is a binary system with an orbital
period of 20.76 +/- 0.01 hr.  The primary rotates with a period of
2.5946 +/- 0.0001 hr, and its lightcurve amplitude of 0.13 mag
indicates a nearly spheroidal shape.  Mutual eclipse/occultation
events that are 0.08-0.17 mag deep indicate a secondary-to-primary
mean-diameter ratio of 0.28 +/- 0.02.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2005 CBAT
2005 December 29                 (CBET 341)               Daniel W. E. Green