Electronic Telegram No. 4316
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


(6016) 1991 PA11
     V. Benishek, Belgrade Astronomical Observatory; P. Pravec, H. Kucakova,
K. Hornoch, and P. Kusnirak, Ondrejov Observatory; A. Aznar, Isaac Aznar
Observatory, Centro Astronomico del Alto Turia, Aras de los Olmos, Spain; D.
Pray, Sugarloaf Mountain Observatory, South Deerfield, MA, U.S.A.; W. Cooney,
Starry Night Observatory, Columbus, TX, U.S.A.; and R. Montaigut and A. Leroy,
OPERA Observatory, France, report that photometric observations taken with a
0.35-m telescope at the Sopot Observatory in Serbia, a 0.65-m telescope at
the Ondrejov Observatory, a 0.35-m telescope at the Isaac Aznar Observatory, a
0.50-m telescope at the Sugarloaf Mountain Observatory, a 0.43-m telescope at
the Starry Night Observatory, and a 0.20-m telescope at the OPERA Observatory
during 2016 Aug. 25-Sept. 5 reveal that minor planet (6016) is a binary
system with an orbital period of 21.33 +/- 0.02 hr.  The primary shows a
period of 2.8028 +/- 0.0002 hr and has a lightcurve amplitude of 0.07 mag at
solar phases 18-23 degrees, suggesting a nearly spheroidal shape.  Mutual
eclipse/occultation events that are 0.04- to 0.09-magnitude deep indicate a
secondary-to-primary mean-diameter ratio of 0.20 +/- 0.03.


NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
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                         (C) Copyright 2016 CBAT
2016 September 6                 (CBET 4316)              Daniel W. E. Green