Electronic Telegram No. 5406
Central Bureau for Astronomical Telegrams
Mailing address:  Hoffman Lab 209; Harvard University;
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Prepared using the Tamkin Foundation Computer Network


(17251) VONDRACEK
     V. Benishek, Belgrade Astronomical Observatory; P. Pravec, Ondrejov
Observatory; R. Durkee, Shed of Science South Observatory, Pontotoc, TX, USA;
D. Augustin, Anglet, France; and J. Oey, Blue Mountains Observatory, Leura,
NSW, Australia, report that photometric observations taken with a 0.35-m
telescope at the Sopot Observatory in Serbia, a 0.50-m telescope at the Shed
of Science South Observatory, a 0.35-m telescope at the e-EyE Observatory
in Spain, and a 0.35-m telescope at the Blue Mountains Observatory during
Apr. 12-June 15 reveal that minor planet (17251) is a binary system with an
orbital period of 16.42 +/- 0.01 hr.  The primary shows a period of 3.7798 +/-
0.0003 hr and has a lightcurve amplitude of 0.13 mag at solar phase 7 degrees,
suggesting a nearly spheroidal shape.  Mutual eclipse/occultation events that
are 0.08 magnitude deep indicate a lower limit on the secondary-to-primary
mean-diameter ratio of 0.28.


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2024 June 19                     (CBET 5406)              Daniel W. E. Green