Electronic Telegram No. 2648
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
CBAT Director:  Daniel W. E. Green; 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


(99913) 1997 CZ5
     D. Higgins, Canberra, Australia; P. Pravec, P. Kusnirak, and K. Hornoch,
Ondrejov Observatory; J. Pollock, Appalachian State University; W. Cooney, J.
Gross, and D. Terrell, Sonoita Research Observatory, Sonoita, AZ, U.S.A.; J.
Oey, Leura, N.S.W., Australia; J. Brinsfield, Via Capote Observatory, Thousand
Oaks, CA, U.S.A.; and D. E. Reichart, K. M. Ivarsen, J. B. Haislip, and A.
LaCluyze, Physics and Astronomy Department, University of North Carolina,
Chapel Hill; and R. Durkee, Shed of Science Observatory, Minneapolis, MN,
U.S.A., report that photometric observations obtained during Jan. 8-30 reveal
that minor planet (99913) is a binary system with an orbital period of 14.68
hr.  The primary shows a period of 2.83507 +/- 0.00002 hr, and it has a
lightcurve amplitude of 0.19 mag.  Mutual eclipse/occultation events that are
0.033- and 0.042-magnitude deep indicate a secondary-to-primary mean-diameter
ratio of 0.19 +/- 0.02.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2011 CBAT
2011 February 3                  (CBET 2648)              Daniel W. E. Green