Electronic Telegram No. 5553
Central Bureau for Astronomical Telegrams
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(11361) ORBINSKIJ
     V. Benishek, Belgrade Astronomical Observatory; P. Pravec, Ondrejov
Observatory; and R. Durkee, Shed of Science South Observatory, Pontotoc, TX,
U.S.A., report that photometric observations taken with a 0.35-m telescope at
the Sopot Observatory in Serbia and a 0.50-m telescope at the Shed of Science
South Observatory during Mar. 5-Apr. 27 reveal that minor planet (11361) is a
binary system with an orbital period of 16.659 +/- 0.005 hr.  The primary
shows a period of 2.9497 +/- 0.0001 hr and has a lightcurve amplitude of 0.19
magnitude at solar phases 3-11 degrees, suggesting a nearly spheroidal shape.
Mutual eclipse/occultation events that are 0.07 magnitude deep indicate a
lower limit on the secondary-to-primary mean-diameter ratio of 0.26.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2025 CBAT
2025 May 6                       (CBET 5553)              Daniel W. E. Green