[IAUC] CBET 1835: 20090606 : (3868) MENDOZA

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                                                  Electronic Telegram No. 1835
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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(3868) MENDOZA
     J. Oey, Leura Observatory, Leura, N.S.W., Australia; P. Pravec, P.
Kusnirak, and K. Hornoch, Ondrejov Observatory; J. Brinsfield, Via Capote
Observatory, Thousand Oaks, CA, U.S.A.; V. Chiorny, Kharkiv Observatory; D.
Pray, Carbuncle Observatory, W. Brookfield, MA, U.S.A.; and M. Pikler and M.
Husarik, Skalnate Pleso Observatory, report that photometric observations
obtained during Apr. 25 to May 25 reveal that minor planet (3868) is a binary
system with an orbital period of 24.38 hr.  The primary shows a period of
2.77090 +/- 0.00005 hr and has a lightcurve amplitude of 0.10 mag, suggesting
a nearly spheroidal shape.  Mutual eclipse/occultation events with a depth of
0.05 mag indicate a secondary-to-primary mean-diameter ratio of 0.22 +/- 0.02.
The mean absolute R-band magnitude and the slope parameter of the system are
H_R = 12.30 +/- 0.04 and G_R = 0.23 +/- 0.05.


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                         (C) Copyright 2009 CBAT
2009 June 6                      (CBET 1835)              Daniel W. E. Green