[IAUC] CBET 535: 20060602 : 2004 DC

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                                                  Electronic Telegram No. 535
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS en CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT en CFA.HARVARD.EDU (science)
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2004 DC
     P. A. Taylor and J. L. Margot, Cornell University; M. C. Nolan,
National Astronomy and Ionosphere Center; L. A. M. Benner, S. J. Ostro,
and J. D. Giorgini, Jet Propulsion Laboratory; and C. Magri, University
of Maine at Farmington, write that Arecibo (2380-MHz, 12.6-cm) radar
observations on June 2 UT show that the Apollo-type minor planet 2004 DC
(cf. MPECs 2004-D05, 2006-L08) is a binary system.  Preliminary estimates
of the diameters, based on visible range extents, are 300 m for the
primary and 60 m for the secondary.  The range-Doppler separation between
components was 300 m at 0.7 Hz on June 2.46.  Photometric observations
are encouraged.


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                         (C) Copyright 2006 CBAT
2006 June 2                      (CBET 535)               Daniel W. E. Green