Electronic Telegram No. 799
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 2007B IN NGC 7315
     S. Benetti, A. Harutyunyan, M. Turatto, and E. Cappellaro, Istituto
Nazionale di Astrofisica, Osservatorio Astronomico di Padova; and R.
Cosentino and G. Tessicini, Telescopio Nazionale Galileo (TNG), report
that a spectrum of 2007B (cf. CBET 797), obtained on Jan. 8.83 UT with
the 3.5-m TNG (+ DOLORES; range 340-920 nm, resolution 1.2 nm), shows it
to be a type-Ia supernova near maximum light.  The spectrum closely
resembles that of SN 1992A at 5 days before maximum light.  Adopting a
recession velocity of 6312 km/s (Huchra et al. 1999, via NED), the
expansion velocity derived from the Si II line (635.5 nm) is about 11800
km/s.
     K. Ayani, Bisei Astronomical Observatory (BAO); and H. Yamaoka,
Kyushu University, write that a low-resolution spectrum of 2007B,
obtained on Jan. 9.4 UT with the BAO 1.01-m telescope, shows it to be a
type-Ia supernova near the maximum light.  The expansion velocity derived
from the blueshift of the Si II 635.5-nm absorption line is about 12000
km/s.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2007 CBAT
2007 January 9                   (CBET 799)               Daniel W. E. Green