Electronic Telegram No. 4342
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


(4296) VAN WOERKOM
      C. E. Odden, Phillips Academy, Andover, MA, USA; P. Pravec, Ondrejov
Observatory; F. Pilcher, Organ Mesa Observatory, Las Cruces, NM, USA; D. A.
Klinglesmith, Etscorn Campus Observatory, Socorro, NM, USA; and V. Benishek,
Belgrade Astronomical Observatory, report that photometric observations taken
with a 0.40-m telescope at the Phillips Academy Observatory, a 0.36-m
telescope at the Organ Mesa Observatory, a 0.36-m telescope at the Etscorn
Campus Observatory, and a 0.35-m telescope at the Sopot Observatory in Serbia
during 2016 Nov. 29-Dec. 28 reveal that minor planet (4296) is a binary system
with an orbital period of 26.23 +/- 0.01 hr.  The primary shows a period of
2.8087 +/- 0.0002 hr and has a lightcurve amplitude of 0.20 mag at solar
phases 20-29 degrees, suggesting a nearly spheroidal shape.  Mutual
eclipse/occultation events that are 0.12- to 0.17-magnitude deep indicate a
secondary-to-primary mean-diameter ratio of 0.34 +/- 0.02.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2017 CBAT
2017 January 8                   (CBET 4342)              Daniel W. E. Green