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IAUC 7921: 2002dm; 2002 KK_8; C/2002 C1

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                                                  Circular No. 7921
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)

SUPERNOVA 2002dm IN IC 5017
     Ella Sanders, Rosny Park, Tasmania, Australia, reports her
discovery of an apparent supernova, located 28".3 east and 11".8
north of the center of IC 5017 (R.A. = 20h32m.1, Decl. = -57o35',
equinox 2000.0), on CCD images obtained with the Canopus Hill
Observatory 1-m reflector on May 4.765, 10.771, 13.695 (V about
19.0 +/- 0.5), and 14.836 UT.  Nothing is visible at this location
on two Digitized Sky Survey images.
     M. Turatto, M. Riello, G. Altavilla, S. Benetti, and A.
Pastorello, Padova; and E. Cappellaro, Capodimonte, report that
preliminary analysis of a spectrum (range 440-880 nm, resolution
1.2 nm), obtained on June 16.4 UT with the Very Large Telescope (+
FORS2) at the European Southern Observatory, shows that SN 2002dm
is a type-Ia supernova, about 50 days past maximum.  The following
magnitude and colors were measured for the supernova:  V = 19.60,
B-V = +0.75, V-R = 0.00.

2002 KK_8
     M. C. Nolan and E. S. Howell, National Astronomy and
Ionosphere Center; S. J. Ostro, L. A. M. Benner, and J. D. Giorgini,
Jet Propulsion Laboratory; J.-L. Margot, California Institute of
Technology; and D. B. Campbell, Cornell University, write: "Arecibo
radar delay-Doppler images (2380 MHz, 12.6 cm) obtained on June 8.0
UT show that 2002 KK_8 (cf. MPEC 2002-K75, 2002-L56) is a binary
system.  Preliminary estimates of average diameters, based on range
extents at 15-m resolution, are 500 and 100 m.  With only one day
of observations, the binary orbit is very poorly constrained.
Optical lightcurve observations would be extremely valuable."

     J. E. Lyke, M. S. Kelley, D. C. Jackson, R. D. Gehrz, and C.
E. Woodward, University of Minnesota (UM), report 1- to 12-micron
photometry of this comet on May 22.37 UT at the Mt. Lemmon
Observing Facility 1.52-m telescope (+ UM bolometer + IRTF
narrowband 'silicate' filters).  No evidence for strong silicate
emission was observed at 11 microns; short-wavelength data were fit
to a 5800-K reflected solar blackbody, while the observed spectral
energy distribution at longer wavelengths yields a blackbody color
temperature of 270 +/- 15 K.  Observed magnitudes:  [J] = 10.87 +/-
0.02, [H] = 10.42 +/- 0.01, [K] = 10.26 +/- 0.01, [L'] = 8.78 +/-
0.28, [M] = 6.49 +/- 0.29, [N] = 1.98 +/- 0.24, [8.81 microns] =
2.81 +/- 0.34, [10.27 microns] = 1.33 +/- 0.06, [11.70 microns] =
1.18 +/- 0.31, and [12.49 microns] = 0.34 +/- 0.31.

                      (C) Copyright 2002 CBAT
2002 June 17                   (7921)            Daniel W. E. Green

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