Electronic Telegram No. 218
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 2005dv IN NGC 5283
     D. C. Leonard, California Institute of Technology, reports on behalf
of the Caltech Core-Collapse Project (cf. IAUC 8405) that a CCD spectrum
(range 400-900 nm) of SN 2005dv (CBET 217), obtained on Sept. 8 UT with
the double spectrograph mounted on the Palomar Observatory 5-m Hale
telescope, shows it to be a young type-Ia supernova, probably before
maximum light.  The supernova expansion velocity, derived from the
minimum of the strong Si II feature (rest 635.5 nm), and adopting the NED
recession velocity of 3119 km/s for the host galaxy (from Falco et al.
1999, PASP 111, 438), is 13000 km/s.  Interstellar Na I D absorption at
the redshift of NGC 5283 with an equivalent width of about 0.22 nm is
detected in the spectrum of SN 2005dv, indicating gas along the
line-of-sight in the host and thus suggesting reddening by dust.


NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
      superseded by text appearing later in the formal IAU Circulars.

                         (C) Copyright 2005 CBAT
2005 September 8                 (CBET 218)               Daniel W. E. Green