Electronic Telegram No. 1542
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://www.cfa.harvard.edu/iau/cbat.html


(15268) 1990 WF3
     J. Oey, Leura Observatory, N.S.W., Australia; P. Pravec, P. Kusnirak,
and K. Hornoch, Ondrejov Observatory; R. Stephens, Goat Mountain
Astronomical Research Station, Yucca Valley, CA, U.S.A.; S. Gajdos and L.
Kornos, Modra Observatory; and V. Chiorny, Institute of Astronomy, Kharkiv
National University, report that photometric observations obtained during
Sept. 24-Oct. 9 reveal that minor planet (15268) is a binary system with an
orbital period of 25.07 +/- 0.02 hr.  The primary shows a period of 2.4224
+/- 0.0001 hr, and it has a lightcurve amplitude of 0.07 mag, suggesting a
nearly spheroidal shape.  Mutual eclipse/occultation events indicate a
lower limit on the secondary-to-primary mean-diameter ratio of 0.27.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2008 CBAT
2008 October 20                  (CBET 1542)              Daniel W. E. Green