Electronic Telegram No. 4243
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


(2242) BALATON
      A. Marchini, F. Salvaggio, and R. Papini, Astronomical Observatory,
Dipartimento di Scienze Fisiche della Terra e dell'Ambiente, University
of Siena; P. Pravec, Ondrejov Observatory; D. Klinglesmith, Magdalena Ridge
Observatory; D. Pray, Sugarloaf Mountain Observatory, South Deerfield, MA,
U.S.A.; P. Bacci, Astronomical Observatory of San Marcello Pistoiese, Italy;
L. Franco, Balzaretto Observatory, Rome, Italy; and A. Carbognani,
Astronomical Observatory of the Aosta Valley Autonomous Region, Italy, report
that photometric observations taken with a 0.30-m telescope at the
Astronomical Observatory of the University of Siena, a 0.36-m telescope at
the Etscorn Campus Observatory (Socorro, NM, U.S.A.), a 0.50-m telescope at
the Sugarloaf Mountain Observatory, and a 0.60-m telescope at the San Marcello
Pistoiese Observatory during 2015 Dec. 27-2016 Jan. 16 reveal that minor
planet (2242) is a binary system with an orbital period of 12.96 +/- 0.01 hr.
The primary shows a period of 2.79792 +/- 0.00009 hr and has a lightcurve
amplitude of 0.18 mag at solar phases 5-16 degrees, suggesting a nearly
spheroidal shape.  Mutual eclipse/occultation events that are 0.03- to
0.08-magnitude deep indicate a lower limit on the secondary-to-primary
mean-diameter ratio of 0.25.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2016 CBAT
2016 January 23                  (CBET 4243)              Daniel W. E. Green