Electronic Telegram No. 5647
Central Bureau for Astronomical Telegrams
Mailing address:  Hoffman Lab 209; Harvard University;
 20 Oxford St.; Cambridge, MA  02138; U.S.A.
e-mail:  cbatiau@eps.harvard.edu (alternate cbat@iau.org)
URL http://www.cbat.eps.harvard.edu/index.html
Prepared using the Tamkin Foundation Computer Network


(13166) 1995 WU_1
     R. Durkee, Shed of Science South Observatory, Pontotoc, TX, U.S.A.; P.
Pravec, Ondrejov Observatory; F. Vachier, Observatoire de Paris; N. Ruocco,
Osservatorio Astronomico Nastro Verde, Sorrento, Italy; V. Benishek, Belgrade
Astronomical Observatory; and A. Klotz, J. Berthier, and P. Thierry,
Observatoire des Makes, Reunion, report that photometric observations taken
with a 0.50-m telescope at the Shed of Science South Observatory, a 0.6-m
telescope at the Observatoire des Makes, a 0.35-m telescope at the
Osservatorio Astronomico Nastro Verde, and a 0.35-m telescope at the Sopot
Observatory in Serbia during Oct. 30-Nov. 26 reveal that minor planet (13166)
is a binary system with an orbital period of 26.45 +/- 0.01 hr.  The primary
shows a period of 3.8101 +/- 0.0002 hr and has a lightcurve amplitude of
0.25 magnitude at solar phases 2-14 degrees.  Mutual eclipse/occultation
events that are 0.10 magnitude deep indicate a secondary-to-primary mean-
diameter ratio of 0.31 +/- 0.02.


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      superseded by text appearing later in the printed IAU Circulars.

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2025 December 12                 (CBET 5647)              Daniel W. E. Green