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IAUC 7500: 2000do; C/1998 K1

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                                                  Circular No. 7500
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
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SUPERNOVA 2000do IN NGC 6754
     Brett White, Linden, N.S.W., reports his visual discovery with
a 0.5-m f/4.8 reflector on Sept. 30.5 UT of an apparent supernova
in NGC 6754.  R. Evans reports the following position for SN 2000do,
from a CCD image obtained by C. Bembrick (Walang, N.S.W., 0.41-m
reflector + CCD) on Sept. 30.58 UT, using 11 GSC stars:  R.A. =
19h11m26s.19, Decl. = -50o38'24".5 (equinox 2000.0), which is 4".5
east and 7".6 north of the center of NGC 6754.  G. L. White, Nepean
Centre for Astronomy, Kingswood, N.S.W., reports the following
position end figures from a CCD image taken on Sept. 30.53 by T.
Dobosz (using 11 GSC 1.2 stars):  26s.33, 24".3, which is located
in the arm of the galaxy and about 7".9 east and 7".4 north of the
galaxy nucleus; the magnitude of SN 2000do was estimated to be 15.6,
but White notes that the exposure was taken with a blue-enhanced
CCD with an infrared rejection filter.
     N. B. Suntzeff, Cerro Tololo Interamerican Observatory (CTIO),
communicates:  "R. Chandar and H. Ford (Johns Hopkins University)
have obtained spectrophotometry (range 380-560 nm; resolution 1000)
of SN 2000do with the CTIO 1.5-m facility spectrograph and CCD
camera on Sept. 30.98 UT.  The data were reduced by R. C. Smith
(CTIO) and A. Clocchiatti (Universidad Catolica de Chile).  The
object appears to be a normal type-Ia supernova at or a few days
past maximum light, based on the presence of the blueshifted Ca II
lines at (rest wavelength) 395 nm, Si II 413-nm, the S II 'doublet'
at 547 and 565 nm, and the Fe II/III blends from 400 to 500 nm.  It
is very similar to the spectrum of SN 1992A at day +5 (Fig. 8,
Kirshner et al. 1993, Ap.J. 415, 589)."

     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 prediscovery
near-infrared photometry (aperture diameter 8") of comets C/1998 K1
and C/1998 M2 from the Two-Micron All-Sky Survey at Mount Hopkins
and Cerro Tololo, respectively:  Comet C/1998 K1, 1998 Apr. 4.316
UT, J = 15.2 +/- 0.1, H = 14.9 +/- 0.1, K_s = 14.7 +/- 0.1; May
10.223, 15.4 +/- 0.1, 14.9 +/- 0.1, 14.9 +/- 0.3.  Comet C/1998 M2,
May 4.404, J = 14.8 +/- 0.1, H = 14.3 +/- 0.1, K_s = 14.3 +/- 0.1.
Both objects showed some coma with no tail.

                      (C) Copyright 2000 CBAT
2000 October 1                 (7500)            Daniel W. E. Green

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