Electronic Telegram No. 472
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


(4786) TATIANINA
     D. Pray, Carbuncle Hill Observatory, Greene, RI; P. Pravec and P.
Kusnirak, Ondrejov Observatory; S. Nudds, Elginfield Observatory,
University of Western Ontario; A. Galad, S. Gajdos, and J. Vilagi,
Modra Observatory; and R. Koff, Antelope Hills Observatory, Bennett,
CO, report that photometric observations obtained during Mar. 20-Apr. 8
reveal that minor planet (4786) is a binary system with an orbital
period of 21.67 +/- 0.01 hours.  The primary rotates with a period of
2.9227 +/- 0.0001 hours, and it has a lightcurve amplitude of 0.20 mag.
Mutual eclipse/occultation events that are 0.04-mag deep indicate a
secondary-to-primary mean-diameter ratio of 0.19 +/- 0.03.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2006 CBAT
2006 April 11                    (CBET 472)               Daniel W. E. Green