Electronic Telegram No. 517
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 2006cj
     S. Blondin, M. Modjaz, R. Kirshner, and P. Challis, Harvard-Smithsonian
Center for Astrophysics, report that a spectrogram (range 350-740 nm) of SN
2006cj (cf. CBET 515), obtained on May 22.32 UT by M. Calkins with the F. L.
Whipple Observatory 1.5-m telescope (+ FAST), shows it to be a type-Ia
supernova around maximum light.  Cross-correlation with a library of
type-Ia-supernova spectra indicates that 2006cj is most similar to the
1991T-like supernova 1998es (cf. IAUC 7054) at 1 day past maximum.  Narrow
emission lines are detected from the host galaxy at a redshift of cz = 20106
+/- 30 km/s, consistent with the NED recession velocity of 20241 km/s
(Cortese et al. 2003, A.Ap. 401, 471) for the apparent host galaxy (whose
2MASX position is given as R.A. = 12h59m24s.1, Decl.= +28o20'50", equinox
2000.0).  Adopting either value for the recession velocity of the supernova,
the maximum absorption in the (relatively weak) Si II line (rest 635.5 nm)
is blueshifted by roughly 10500 km/s.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2006 CBAT
2006 May 22                      (CBET 517)               Daniel W. E. Green