Central Bureau for Astronomical Telegrams
IAUC 8474: 2005V; 2005M; 164P
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Circular No. 8474
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 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)
URL http://cfa-www.harvard.edu/iau/cbat.html ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)
SUPERNOVA 2005V IN NGC 2146
Further to IAUC 8473, S. Mattila et al. report the discovery
of another apparent supernova (mag 13.8) in K_s-band images
obtained on Jan. 30.16 UT at the William Herschel Telescope. The
new object is located at R.A. = 6h18m38s.28, Decl. = +78o21'28".8
(equinox 2000.0), which is 1".8 east and 3".4 north of the K_s-band
nucleus of the starburst galaxy NGC 2146. J- and H-band
observations of SN 2005V yield preliminary colors J-H = +0.13 +/-
0.33 and H-K = +0.18 +/- 0.34, indicating modest extinction.
Following requests by the Central Bureau, T. Boles (Coddenham,
Suffolk, England; limiting mag 20.5), T. Puckett (Ellijay, GA;
limiting mag 20), and K. Kadota (Ageo, Saitama-ken, Japan; via S.
Nakano) report that their CCD images obtained on Feb. 1 UT show
that SN 2005V could not be definitively separated from the bright
core of NGC 2146.
S. Taubenberger and A. Pastorello, Max-Planck-Institut fuer
Astrophysik, Garching; and S. Benetti, Istituto Nazionale di
Astrofisica, Osservatorio Astronomico di Padova, on behalf of the
European RTN collaboration, report that inspection of a spectrogram
of SN 2005V, obtained on Feb. 1.0 UT by J. Aceituno with the Calar
Alto 2.2-m telescope (+ CAFOS; range 330-880 nm), shows it to be a
type-Ib/c supernova, about 1-2 weeks past maximum. The very red
continuum and the deep interstellar Na I D (EW = 0.55 nm) suggest
heavy host-galaxy extinction. The spectrum shows P-Cyg lines of Fe
II, Na I D, O I, and Ca II. Also, a strong absorption at 620 nm is
visible, possibly due to Si II. No clear evidence of He I lines is
found.
SUPERNOVA 2005M IN NGC 2930
R. C. Thomas, Lawrence Berkeley National Laboratory, writes on
behalf of the 'Nearby Supernova Factory' that a spectrogram (range
330-990 nm) of SN 2005M (IAUC 8470), obtained Jan. 24.52 UT with
the University of Hawaii 2.2-m telescope (+ SuperNova Integral
Field Spectrograph), shows it to be a type-Ia supernova that is
most similar to SN 1991T at about 12 days before maximum. Weak Ca
II H and K and Fe III features are evident. The spectrum is very
blue and lacks interstellar Na I D, indicating very little or no
extinction.
COMET 164P/2004 Y1 (CHRISTENSEN)
Following the identification of observations in 1998 Jan. and
Apr. (cf. MPC 53463), comet P/2004 Y1 (cf. IAUC 8458) has been
numbered 164P/Christensen.
(C) Copyright 2005 CBAT
2005 February 1 (8474) Daniel W. E. Green
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