[IAUC] CBET 1163: 20071212 : SUPERNOVA 2007sa IN NGC 3499

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                                                  Electronic Telegram No. 1163
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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SUPERNOVA 2007sa IN NGC 3499
     I. Agnoletto, A. Harutyunyan, S. Benetti, M. Turatto, and E. Cappellaro,
Osservatorio Astronomico di Padova and INAF; M. Dennefeld, Institut
d'Astrophysique de Paris; and C. Adami, Observatoire de Haute-Provence (OHP),
report that a spectrum of 2007sa (cf. CBET 1161), obtained on Dec. 12.14 UT
with the OHP 1.93-m telescope (+ CARELEC; range 390-720 nm, resolution 0.6
nm), shows it to be a type-Ia supernova one month after maximum light.
Adopting a recession velocity of 1522 km/s (SDSS data release 2, via NED),
the expansion velocity, derived from the by-this-time-faint Si II line
(635.5 nm), is about 9000 km/s.  An interstellar Na I D absorption line (EW
about 0.18 nm) is detected in the parent-galaxy restframe, suggesting an
E(B-V) reddening of about 0.27 mag [Turatto et al. 2003, *From Twilight to
Highlight: The Physics of Supernovae* (Berlin:  Springer), p. 200].


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                         (C) Copyright 2007 CBAT
2007 December 12                 (CBET 1163)              Daniel W. E. Green