Electronic Telegram No. 288
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


(5477) 1989 UH_2
     B. D. Warner, Palmer Divide Observatory, Colorado
Springs; P. Pravec and P. Kusnirak, Ondrejov Observatory;
W. Cooney, J. Gross, and D. Terrell, Sonoita Research
Observatory, Sonoita, AZ; D. Higgins, Ngunnawal, Canberra,
Australia; L. Kornos and J. Vilagi, Modra Observatory; D.
Pray, Greene, RI; G. Masi, Universita degli Studi di Roma
"Tor Vergata"; and F. Mallia, Campo Catino, Italy, report
that observations obtained during Nov. 2-12 show that the
minor planet (5477) is a binary system with an orbital
period of 24.42 +/- 0.02 hr.  The primary rotates with a
period of 2.9943 +/- 0.0002 hr, and its lightcurve amplitude
of 0.11 mag indicates a nearly spherical shape.  Mutual
eclipse/occultations events that are 0.14-0.22 mag deep
indicate a secondary-to-primary mean-diameter ratio of 0.37
+/- 0.02.  Follow-up observations in the next lunation are
desirable.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2005 CBAT
2005 November 15                 (CBET 288)               Daniel W. E. Green