Electronic Telegram No. 4158
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)
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Prepared using the Tamkin Foundation Computer Network


(4272) ENTSUJI
     V. Benishek, Belgrade Astronomical Observatory; J. Pollock, D. Caton,
and R. Hawkins, Appalachian State University; P. Pravec, Ondrejov
Observatory; D. Pray, Sugarloaf Mountain Observatory, South Deerfield, MA,
U.S.A.; V. Chiorny, Kharkiv Observatory; D. Reichart and J. Haislip,
University of North Carolina, Chapel Hill; and A. Smith, Gemini North,
report that photometric observations obtained during Sept. 14-Oct. 15
reveal that minor planet (4272) is a binary system with an orbital period
of 15.945 +/- 0.006 hr.  The primary shows a period of 2.8087 +/- 0.0002 hr
and has a lightcurve amplitude of 0.06 mag at solar phases 4-9 degrees,
suggesting a nearly spheroidal shape.  Mutual eclipse/occultation events
that are 0.03- to 0.08-magnitude deep indicate the secondary-to-primary
mean-diameter ratio of 0.18.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2015 CBAT
2015 October 30                  (CBET 4158)              Daniel W. E. Green