Electronic Telegram No. 5130
Central Bureau for Astronomical Telegrams
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(10140) VILLON
     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. 9-Apr. 30 reveal that minor planet (10140) is a
binary system with an orbital period of 28.47 +/- 0.01 hr.  The primary shows
a period of 2.50861 +/- 0.00007 hr and has a lightcurve amplitude of 0.12
magnitude at solar phases 1-15 degrees, suggesting a nearly spheroidal shape.
Mutual eclipse/occultation events that are 0.10 to 0.20 magnitude deep
indicate a lower limit on the secondary-to-primary mean-diameter ratio of 0.31.


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      superseded by text appearing later in the printed IAU Circulars.

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2022 June 8                      (CBET 5130)              Daniel W. E. Green