Electronic Telegram No. 27
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html


S/2003 (283) 1
     W. J. Merline, Southwest Research Institute (SwRI);
C. Dumas, Jet Propulsion Laboratory; N. Siegler and L. M.
Close, University of Arizona; C. R. Chapman, P. M. Tamblyn,
D. Terrell, SwRI; A. Conrad, Keck Observatory; F. Menard and
G. Duvert, Observatoire de Grenoble, report the discovery on
July 14.6 UT of a satellite of minor planet (283) Emma
from K'-band imaging with the 10-m Keck II Telescope
(+ NIRC2/AO adaptive optics system) on Mauna Kea.  On July
14.5579 the satellite was at separation 0".26 (projected
separation 370 km) and position angle 218 deg; a detection in
H-band was also made on July 14.6026.  The satellite was also
observed by the same team with the European Southern
Observatory 8-m Very Large Telescope UT4/YEPUN (+ NAOS/CONICA
adaptive optics system) on July 15.2750, 15.4229, and 16.4375
in band J, H, and K_s.  The H-band brightness difference is
about 5.5 mag, giving an estimated diameter of the satellite
of about 12 km.


NOTE: These 'Central Bureau Electronic Telegrams' are intended to
      be preliminary announcements of items that later appear in the
      formal IAU Circulars.  Citations should normally be made to IAUCs
      rather than to CBETs.

                         (C) Copyright 2003 CBAT
2003 July 17                      (CBET 27)               Daniel W. E. Green