[IAUC] CBET 414: 20060301 : (9617) GRAHAMCHAPMAN

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                                                  Electronic Telegram No. 414
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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CBAT en CFA.HARVARD.EDU (science)
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(9617) GRAHAMCHAPMAN
     D. Pray, Carbuncle Hill Observatory, Greene, RI; P. Pravec
and P. Kusnirak, Ondrejov Observatory; V. Reddy, Department of
Space Studies, University of North Dakota, Grand Forks; R. Dyvig,
Quinn, SD; and S. Gajdos, Modra Observatory, report that photometric
observations obtained during 2006 Jan. 27 to Feb. 28 reveal that
minor planet (9617) is a binary system with an orbital period of
19.385 +/- 0.005 hours.  The primary rotates with a period of
2.2856 +/- 0.0001 hours, and its lightcurve amplitude of 0.10 mag
is indicative of a nearly spheroidal shape.  Mutual eclipse/occultation
events that are 0.07- to 0.16-mag deep indicate a secondary-to-primary
mean-diameter ratio of 0.27 +/- 0.03.


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                         (C) Copyright 2006 CBAT
2006 March 1                     (CBET 414)               Daniel W. E. Green