[Iaude] CBET 4336: 20161110 : (5112) KUSAJI

quai at eps.harvard.edu quai at eps.harvard.edu
Wed Nov 9 21:15:49 EST 2016

                                                  Electronic Telegram No. 4336
Central Bureau for Astronomical Telegrams
Mailing address:  Hoffman Lab 209; Harvard University;
 20 Oxford St.; Cambridge, MA  02138; U.S.A.
e-mail:  cbatiau at eps.harvard.edu (alternate cbat at iau.org)
URL http://www.cbat.eps.harvard.edu/index.html
Prepared using the Tamkin Foundation Computer Network

(5112) KUSAJI
     V. Chiorny, Kharkiv Observatory; P. Pravec, Ondrejov Observatory; D.
Romeuf, Lyon University; R. Montaigut, A. Leroy, and C. Gillier, OPERA
Observatory, France; V. Benishek, Belgrade Astronomical Observatory; A.
Marchini, R. Papini, and F. Salvaggio, Dipartimento di Scienze Fisiche, Della
Terra e Dell'Ambiente, University of Siena; and J. Oey, Blue Mountains
Observatory, Leura, NSW, Australia, report that photometric observations taken
with a 0.70-m telescope at the Chuguev station of the Kharkiv Observatory in
Ukraine, a 0.36-m telescope at Pommier Observatory in France, a 0.20-m
telescope at the OPERA Observatory, a 0.35-m telescope at the Sopot
Observatory in Serbia, a 0.30-m telescope at the Astronomical Observatory of
the University of Siena, and a 0.61-m telescope at the Blue Mountains
Observatory during 2016 Oct. 25 to Nov. 1 reveal that minor planet (5112) is
a binary system with an orbital period of 20.74 +/- 0.01 hr.  The primary
shows a period of 2.7995 +/- 0.0001 hr and has a lightcurve amplitude of 0.12
mag at solar phases 4-8 degrees, suggesting a nearly spheroidal shape.
Mutual eclipse/occultation events that are 0.10- to 0.17-magnitude deep
indicate a secondary-to-primary mean-diameter ratio of 0.31 +/- 0.02.  The
secondary's rotation appears synchronous with the orbital motion and it has a
lightcurve amplitude of 0.02-0.03 mag in the combined primary-plus-secondary
lightcurve, suggesting a moderately elongated secondary shape with the
equatorial axis ratio being about 1.3.

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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2016 CBAT
2016 November 10                 (CBET 4336)              Daniel W. E. Green

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