Circular No. 8575

    Central Bureau for Astronomical Telegrams
    INTERNATIONAL ASTRONOMICAL UNION
    Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, 
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    SUPERNOVA 2005dc IN NGC 7107
      P. Luckas, Perth, W. Australia; O. Trondal, Oslo, Norway; and
    M. Schwartz, Patagonia, AZ, report the discovery of an apparent
    supernova (mag 15.7) on an unfiltered CCD frame taken with a
    0.35-m Tenagra telescope at Perth on July 26.70 and 27.62 UT in the
    course of the Tenagra Observatory Supernova Search.  SN 2005dc is
    located at R.A. = 21h42m22s.66, Decl. = -44o47'21".2 (equinox
    2000.0), which is 41".1 west and 9".6 north of NGC 7107 (the galaxy
    center having position end figures 26s.50, 30".8).  Nothing was
    visible at the position of 2005dc on an image taken by Luckas on
    July 5.61 (limiting magnitude about 18.5).
 
 
                       (C) Copyright 2005 CBAT
    2005 July 27                   (8575)            Daniel W. E. Green


   
   
    SUPERNOVA 2005dc IN NGC 7107
        D. C. Leonard and A. Gal-Yam, California Institute of
    Technology, report that a preliminarily reduced CCD spectrum
    (range 580-900 nm) of SN 2005dc (IAUC 8575), obtained on July 28
    UT with the Keck I 10-m telescope (+ LRISp), shows it to be
    a type-Ia supernova, probably within a week of maximum light.  The
    supernova expansion velocity, derived from the minimum of Si II
    (rest 635.5 nm), and adopting the NED recession velocity of 2204
    km/s for the host galaxy (from Koribalski et al. 2004, A.J. 128, 16)
    is about 12500 km/s.
   
   
    NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
         superseded by text appearing later in the formal IAU Circulars.
   
                            (C) Copyright 2005 CBAT
    2005 July 29                     (CBET 189)               Daniel W. E.