Central Bureau for Astronomical Telegrams
IAUC 8468: 2005K; 2004gx, 2004gz, 2005C,, 2005G; 163P
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Circular No. 8468
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)
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Phone 617-495-7440/7244/7444 (for emergency use only)
SUPERNOVA 2005K IN NGC 2923
Further to IAUC 8467, O. Trondal and M. Schwartz report the
discovery of an apparent supernova (mag about 17.8) on unfiltered
Tenagra II 0.81-m telescope images taken on Jan. 15.41 and 17.20 UT.
SN 2005K is located at R.A. = 9h36m04s.31, Decl. = +16o45'46".8
(equinox 2000.0), which is 6".7 east and 9".5 north of the nucleus
of NGC 2923. Nothing is visible at this position on an image taken
on 2004 Sept. 12.55 (limiting mag about 19.0).
SUPERNOVAE 2004gx, 2004gz, 2005C, AND 2005G
M. Ganeshalingam, F. J. D. Serduke, and A. V. Filippenko,
University of California, Berkeley, report that inspection of CCD
spectra (range 330-1060 nm), obtained on Jan. 16 UT with the Shane
3-m reflector at Lick Observatory, reveals that SN 2004gz (IAUC
8460) is of type Ia, a few weeks past maximum brightness. SN 2005C
(IAUC 8463) is probably of type Ib, several weeks past maximum; a
set of He I absorption lines appears to be present. SN 2005G (IAUC
8465) is probably of type Ia near maximum, but the spectrum is
somewhat peculiar (e.g., unusually narrow Si II 635.5-nm absorption;
the two S II absorption lines near 550 nm are blended together);
although the optical continuum is very blue, there is a sharp
decline in flux density shortward of the Ca II H + K trough. A
very noisy CCD spectrum, obtained on Jan. 17, suggests that SN
2004gx (IAUC 8459) is probably of type II. A broad emission
feature at the wavelength of H_alpha is visible in the redshifted
spectrum.
H. Navasardyan, S. Benetti, N. Elias-Rosa, and A. Harutunyan,
Osservatorio Astronomico di Padova; and A. Pastorello, Max-Planck-
Institut fuer Astrophysik, Garching, on behalf of the European RTN
colllaboration (cf. IAUC 7987), report that a spectrum of SN 2005G
(cf. IAUC 8465), obtained on Jan. 18.16 UT with the Asiago 1.8-m
telescope (+ AFOSC; range 355-780 nm, resolution 2.4 nm), shows it
to be a type-Ia supernova about 10 days past maximum. The spectrum
closely resembles that of SN 1994D (Patat et al. 1996, MNRAS 278,
111) at comparable phase. The expansion velocity deduced from the
Si II 635.5-nm minimum is about 9400 km/s (adopting the NED
recession velocity of 6938 km/s for the parent galaxy).
COMET 163P/2004 V4 (NEAT)
Following the identification of observations of comet P/2004
V4 (cf. IAUC 8429, 8438) in 1990-1991 and 1997 (cf. MPC 53257,
53303, 53307), the comet has been numbered 163P.
(C) Copyright 2005 CBAT
2005 January 18 (8468) Daniel W. E. Green
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