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IAUC 7518: 2000ek; 2000 UG_11; PLUTO; 73P

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                                                  Circular No. 7518
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 2000ek IN ESO 153-G27
     R. Chassagne, Ste. Clotilde, Ile de Reunion, reports his
discovery of an apparent supernova (mag 17.0) on CCD images taken
with an automated 0.30-m telescope on Nov. 7.822 and 8.722 UT.  SN
2000ek is located at at R.A. = 2h10m30s.04, Decl. = -53o49'28".0
(equinox 2000.0), which is 22" west and 44" north of the center of
ESO 153-G27.  Nothing is visible at this location on an image taken
by Chassagne on Sept. 28 (limiting mag 18), and he adds that the
new object is not present on a U.K. Schmidt plate (via the Digital
Sky Survey) taken on 1975 Nov. 11 (limiting mag 22).


2000 UG_11
     M. C. Nolan, J.-L. Margot, and E. S. Howell, National
Astronomy and Ionosphere Center; L. A. M. Benner, S. J. Ostro,
R. F. Jurgens, and J. D. Giorgini, Jet Propulsion Laboratory; and
D. B. Campbell, Cornell University, report:  "Arecibo radar
delay-Doppler images (2380 MHz, 12.6 cm) obtained on Nov. 3-7 show
that 2000 UG_11 is a binary system.  Preliminary estimates of
average diameters, based on range extents at 15-m resolution, are
230 and 100 m.  The system passed through maximum range separation
(i.e., projected along the line-of-sight) of about 300 m within 15
min of Nov. 7.3646 UT.  Goldstone radar observations (8560 MHz, 3.5
cm) on Nov. 6 confirm the binary nature of this minor planet.
Using the combined data sets, we derive an orbital period of 19 +/-
1.5 hr."


PLUTO
     M. Sykes, University of Arizona; R. Cutri and J. Fowler,
Infrared Processing and Analysis Center, California Institute of
Technology; D. Tholen, University of Hawaii; and M. Skrutskie,
University of Massachusetts, report the following near-infrared
photometry of Pluto from the Two-Micron All-Sky Survey facility at
Cerro Tololo:  1999 Apr. 10.334 UT, J = 12.78 +/- 0.03, H = 12.62
+/- 0.03, K_s = 12.92 +/- 0.03.


COMET 73P/SCHWASSMANN-WACHMANN 3
     A. Nakamura, Kuma, Ehime, Japan, reports that a CCD image
taken low in the morning sky by K. Kadota (Ageo, Saitama, 0.18-m
reflector) on Nov. 4.84 UT shows this comet unexpectedly bright at
m_1 = 13.2, with coma diameter 0'.5 and a 0'.8 tail in p.a. 310 deg.

                      (C) Copyright 2000 CBAT
2000 November 10               (7518)            Daniel W. E. Green

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