Electronic Telegram No. 95
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 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)
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SUPERNOVA 2004et IN NGC 6946
     T. Zwitter, University of Ljubljana; and U. Munari,
Astronomical Observatory, Padova, report the discovery by
S. Moretti, on unfiltered CCD images taken on Sept. 27 with
a 0.4-m telescope at Ravenna, of a bright supernova (mag 12.8)
in NGC 6946.  The new object is located at R.A. = 20h35m25s.4,
Decl. = +60o07'17".6 (equinox 2000.0).  A high-resolution
spectrogram, secured on Sept. 28 with the echelle spectrograph
at the 1.82-m telescope in Asiago, shows a relatively featureless
spectrum with a very broad, low-contrast H_alpha emission.  Sharp
interstellar Na I absorption lines are observed at heliocentric
radial velocities of -21.1 (+/- 0.7) and +45.2 (+/- 0.4) km/s,
matching expectation for separate origin within our galaxy and
NGC 6946.  The equivalent width of Na I D2 lines corresponds to a
total reddening of E(B-V) = 0.41 mag, following the calibration by
Munari and Zwitter (1997, A.Ap. 318, 269).


NOTE: These 'Central Bureau Electronic Telegrams' are intended to
      be preliminary announcements of items that later appear in the
      formal IAU Circulars.  Citations should normally be made to IAUCs
      rather than to CBETs.

                         (C) Copyright 2004 CBAT
2004 September 29                 (CBET 95)               Daniel W. E. Green