Electronic Telegram No. 1810
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 2009eo
     J. M. Silverman, T. N. Steele, B. E. Cobb, and A. V. Filippenko,
University of California, Berkeley, report that inspection of CCD spectra
(range 350-1000 nm), obtained on May 18 UT with the 3-m Shane reflector (+
Kast) at Lick Observatory, shows that 2009eo (CBET 1801) is a type-II
supernova.  Cross-correlation with a library of supernovae spectra using the
"SuperNova IDentification" code (SNID; Blondin and Tonry 2007, Ap.J. 666,
1024) indicates that 2009eo is about one month past maximum and most similar
to the normal type-IIn supernova 1998S at 40 days past maximum.  After
removal of the host-galaxy recession velocity of 13030 km/s, determined from
narrow emission lines, the absorption minimum of the H-alpha line (which is
much weaker than the emission component) is found to be blueshifted by about
5400 km/s.  The emission component of H-alpha has a FWHM of about 6900 km/s.
In addition, SN 2009eo exhibits unusually strong He I 587.6-nm emission
(though this might be blended with Na I D).


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2009 CBAT
2009 May 23                      (CBET 1810)              Daniel W. E. Green