Electronic Telegram No. 3091
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


2004 FG11
     P. A. Taylor, M. C. Nolan, and E. S. Howell, Arecibo Observatory,
National Astronomy and Ionosphere Center; L. A. M. Benner, M. Brozovic, and
J. D. Giorgini, Jet Propulsion Laboratory, California Institute of Technology;
J. L. Margot, M. W. Busch, S. P. Naidu, and C. Nugent, University of
California, Los Angeles; C. Magri, University of Maine at Farmington; and M.
K. Shepard, Bloomsburg University, report that Arecibo (2380-MHz, 12.6-cm)
radar observations on Apr. 7-15 reveal that minor planet 2004 FG11 (cf. MPEC
2004-F60) is a binary system.  Visible range extents in 30-m-resolution radar
images suggest that the diameter of the primary is 120-180 m.  The secondary
is unresolved in 75-m imaging but is no more than 150 m in diameter.  The
separation of the components is 200-300 m, with an orbital period of 20.0 +/-
0.4 hours.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2012 CBAT
2012 April 25                    (CBET 3091)              Daniel W. E. Green