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IAUC 8286: C/2004 C1; 2004T, 2004U,, 2004W

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                                                  Circular No. 8286
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)


COMET C/2004 C1 (LARSEN)
     J. A. Larsen, Lunar and Planetary Laboratory, reports his
discovery of a comet on Spacewatch CCD images obtained with the
0.9-m f/3 reflector on Feb. 12.42 UT (discovery observation below).
Following posting on the NEO Confirmation Page, cometary appearance
was also reported on CCD images taken around Feb. 13.3 by J. Young
(Table Mountain, 0.6-m reflector; 6" coma of total mag 18.0 with
little or no central condensation and a short, stubby tail 14" long
in p.a. 260 deg) and by J. E. McGaha (Tucson, AZ, 0.36-m reflector;
eighteen stacked images show a 6" coma and a 5" fan-shaped tail in
p.a. 90 deg).

     2004 UT             R.A. (2000) Decl.       Mag.
     Feb. 12.42045   10 16 47.43   + 9 41 55.1   20.2

The available astrometry, the following preliminary parabolic
orbital elements, and an ephemeris appear on MPEC 2004-C52.

     T = 2005 Oct. 12.503 TT          Peri. =  70.356
                                      Node  = 151.630   2000.0
     q = 4.26365 AU                   Incl. =  56.251


SUPERNOVAE 2004T, 2004U, AND 2004W
     Further to IAUC 8277, M. Moore and W. Li report the LOSS
discovery of a supernova, designated SN 2004W and located at R.A. =
12h43m36s.52, Decl. = +11o31'50".8 (equinox 2000.0), which is 51".6
west and 78".7 south of the nucleus of NGC 4649.  Approximate KAIT
magnitudes:  2003 June 4.2 UT, [20.0; 2004 Jan. 28.5, 18.8; 29.5,
18.9; Feb. 11.5, 19.3.  A. V. Filippenko, R. Chornock, and R. J.
Foley, University of California at Berkeley, report that inspection
of CCD spectra (range 310-920 nm), obtained on Feb. 13 with the
Keck I 10-m telescope (+ LRIS), shows that SN 2004W is of type Ia,
specifically the underluminous SN 1991bg variety (Filippenko et al.
1992, A.J. 104, 1543; Ruiz-Lapuente et al. 1993, Nature 365, 728),
roughly half a year past maximum brightness.  The spectrum is
dominated by very strong, broad [Ca II] 730-nm emission, with
weaker iron emission lines at blue and visual wavelengths, as well
as the Ca II near-infrared triplet.
     Corrigenda.  On IAUC 8285, the offset for SN 2004T  *should
read*  6".1 E, 10".7 N (not south).  The declination for SN 2004U
*should read*  +28o32'23".6 (not 22').

                      (C) Copyright 2004 CBAT
2004 February 13               (8286)            Daniel W. E. Green

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