Electronic Telegram No. 3755
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
CBAT Director:  Daniel W. E. Green; 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


(3905) DOPPLER
     L. Franco, Rome, Italy; M. Hayes-Gehrke, A. Bartek, T. Basile, B. Bent,
E. Garcia, R. Greenebaum, S. L. Min, M. Maroulis, and N. Oliver, Department of
Astronomy, University of Maryland; and P. Pravec, Ondrejov Observatory, report
that photometric observations obtained during Oct. 20-Dec. 5 reveal that the
minor planet (3905) is a synchronous binary system with a period of 50.8 hr
(error < 0.1 hr).  A combined rotation-plus-eclipse lightcurve has a full
amplitude of 1.22 mag, and observed mutual events indicate a lower limit on
the secondary-to-primary mean-diameter ratio of 0.77.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2013 CBAT
2013 December 16                 (CBET 3755)              Daniel W. E. Green