[IAUC] CBET 2443: 20100904 : SUPERNOVA 2010hh IN NGC 6524

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                                                  Electronic Telegram No. 2443
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
CBAT Director:  Daniel W. E. Green; Hoffman Lab 209; Harvard University;
 20 Oxford St.; Cambridge, MA  02138; U.S.A.
e-mail:  cbatiau en eps.harvard.edu (alternate cbat en iau.org)
URL http://www.cbat.eps.harvard.edu/index.html
Prepared using the Tamkin Foundation Computer Network


SUPERNOVA 2010hh IN NGC 6524
     S. Nakano, Sumoto, Japan, reports that K. Kadota (Ageo, Japan) obtained
a co-added image (limiting mag 18.6) of 2010hh (cf. CBETs 2435, 2440) from
twelve 120-s unfiltered CCD frames taken around Sept. 3.675 UT with a 0.25-m
f/5 reflector (+ SBIG ST-9E camera), yielding mag 17.7 and position R.A. =
17h59m18s.39, Decl. = +45d52'32".1 (equinox 2000.0).

     J. M. Silverman, J. Choi, A. V. Filippenko, and F. J. D. Serduke,
University of California, Berkeley, report that inspection of a CCD spectrum
(range 340-970 nm), obtained on SepT. 3 UT with the 3-m Shane reflector (+
Kast) at Lick Observatory, shows that 2010hh is a type-Ia supernova near
maximum brightness.  After removal of the host-galaxy recession velocity of
5698 km/s (Falco et al. 1999, PASP 111, 438), the absorption minimum of the
Si II 635.5-nm line is found to be blueshifted by about 12600 km/s.  The Si
II line at 597 nm is quite strong, as is Ti II absorption around 420-430 nm,
suggesting that 2010hh is subluminous like SN 1991bg (e.g. Filippenko et al.
1992, AJ 104, 1543), though perhaps not quite as extreme.


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                         (C) Copyright 2010 CBAT
2010 September 4                 (CBET 2443)              Daniel W. E. Green