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IAUC 7503: 2000dp; Sats OF MINOR PLANETS

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                                                  Circular No. 7503
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 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  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)


SUPERNOVA 2000dp IN NGC 1139
     S. Beckmann and W. D. Li, University of California at Berkeley,
on behalf of the Lick Observatory Supernova Search (cf. IAUC 6627,
7126), report the discovery with the 0.8-m Katzman Automatic
Imaging Telescope (KAIT) of an apparent supernova on unfiltered
images taken on Oct. 2.4 and 3.4 UT, both yielding mag about 16.8.
The new object is located at R.A. = 2h52m44s.41, Decl. =
-14o31'54".7 (equinox 2000.0), which is 34".1 west and 8".3 south
of the nucleus of NGC 1139.  A KAIT image of the same field on
Sept. 21.4 showed nothing at this position (limiting mag about
18.5).


SATELLITES OF MINOR PLANETS
     J. L. Margot and M. C. Nolan, National Astronomy and
Ionosphere Center; L. A. M. Benner, S. J. Ostro, R. F. Jurgens,
M. A. Slade, and J. D. Giorgini, Jet Propulsion Laboratory (JPL);
and D. B. Campbell, Cornell University, report:  "Arecibo radar
observations (2380 MHz, 12.6 cm) on Sept. 30-Oct. 3 confirm that
2000 DP_107 is a binary system.  Estimates of the diameters based
on range extents are 800 and 300 m for the primary and secondary,
respectively.  Preliminary fits to delay-Doppler data indicate an
orbital period of 1.77 days and a semimajor axis of 2.6 km
(uncertainties about 10 percent).  Based on the above primary
diameter, these parameters imply that the density of the primary is
about 1.6 g/cm**3."
     W. J. Merline, Southwest Research Institute (SRI); L. M.
Close, European Southern Observatory; J. C. Shelton, Mount Wilson
Observatory; C. Dumas, JPL; F. Menard, Canada-France-Hawaii
Telescope (CFHT); and C. R. Chapman and D. C. Slater, SRI, report
the discovery of a companion of (90) Antiope on Aug. 10.6 UT from
J-, H-, and K'-band direct imaging with the apaptive-optics system
of the 10-m W. M. Keck II Telescope on Mauna Kea:  "The components
differ in brightness by < 0.1 mag and are separated by about 170 km
(0".12).  The orbital plane has a high inclination.  The observers
continued to acquire observations of the fully resolved components
over the next five consecutive nights.  Confirming observations of
the double were made by Merline, Dumas, and Menard at the CFHT on
Sept. 12, 13, and 14.  The orbital period is found to be about 16
hr, consistent with the adopted lightcurve period."
     At the recent IAU General Assembly, the satellite of (45)
Eugenia (cf. IAUC 7129) was given the permanent designation and
name (45) Eugenia I (Petit-Prince).

                      (C) Copyright 2000 CBAT
2000 October 3                 (7503)            Daniel W. E. Green

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