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IAUC 8344: 2004bv; 2004bs; C/2003 T12

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IAUC number 

                                                  Circular No. 8344
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 2004bv IN NGC 6907
     S. Nakano, Sumoto, Japan, reports the discovery by R. Kushida,
Yatsugatake South Base Observatory, of an apparent supernova (mag
15.6) on numerous unfiltered CCD survey frames taken around May
24.70 UT with a 0.40-m Schmidt-Cassegrain reflector.  A follow-up
image by Kushida on May 25.77 showed the new object at mag 15.3.
SN 2004bv is located at R.A. = 20h25m06s.34, Decl. = -24o48'53".7
(equinox 2000.0; measured by Y. Kushida), which is 3".8 west and
20".7 south of the center of NGC 6907.  Nothing is visible at this
location on earlier frames of this field back to 1995 by R.
Kushida, the most recent from 2003 July 24 (limiting mag 19).


SUPERNOVA 2004bs IN NGC 3323
     G. Pignata and F. Patat, European Southern Observatory; and S.
Benetti and A. Harutyunyan, Istituto Nazionale di Astrofisica, on
behalf of the 'European Research and Training Network on the Physics
of Type Ia Supernovae', report that full reduction of a spectrogram
(range 380-880 nm; resolution 1.1 nm) of SN 2004bs (cf. IAUC 8341),
obtained at Calar Alto Observatory on May 19.87 UT using the 2.2-m
reflector, shows that this to be a type-Ib supernova, about 3 weeks
past maximum.  The spectrum is dominated by helium lines at 587.6,
667.8 and 706.5 nm; the photospheric velocities of these three
features (deduced from the minima of absorption throughs) are 10800,
10200, and 10100 km/s, respectively.  Other features are identified
as Ca II and Fe II.  The recession velocity at the supernova
position (measured from the unresolved H_alpha line) is 5165 km/s,
in good agreement with the value for NGC 3393 listed by NED (5164
km/s).


COMET C/2003 T12 (SOHO)
     Further to IAUC 8341, K. Battams reports his measures for an
apparent comet found on SOHO C3 images by J. Danaher (discovery
observation below).  The reductions by R. Kisala and parabolic
orbital elements by B. G. Marsden (T = 2003 Oct. 21.6 TT, q =
0.519, Peri. = 234.7 deg, Node = 181.1 deg, i = 14.5 deg, equinox
2000.0) appear on MPEC 2004-K33.  It is possible that C/2003 T12
has a short period and somewhat smaller perihelion distance, but
the latter is limited by the minimum solar elongation of 5.3 deg;
the object seems to have been too faint to show on SOHO-SWAN
frames.

     2003 UT           R.A. (2000) Decl.
     Oct.  9.431      13 00.9      -11 39

                      (C) Copyright 2004 CBAT
2004 May 25                    (8344)            Daniel W. E. Green

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