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IAUC 8628: 2005io, 2005ip, 2005iq

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                                                  Circular No. 8628
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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SUPERNOVAE 2005io, 2005ip, 2005iq
     Three apparent supernovae have been reported from unfiltered
CCD images:  2005io independently by E. Lee and W. Li (via
LOSS/KAIT; cf. IAUC 8625; the tabulated data below for 2005io are
from KAIT) and by T. Boles (Coddenham, England, 0.35-m reflector);
2005ip by Boles; and 2005iq by H. Khandrika and W. Li (LOSS/KAIT).
Additional magnitudes for 2005io for SN 2005io in UGC 3361:  1989
Dec. 3, [21.0 (Digitized Sky Survey red plate; via Boles); 1992
Nov. 24, [21.5 (DSS, blue); 2005 Mar. 14 UT, [19.5 (Boles); Oct.
10, [19.5 (Boles); 28.46, [19.5 (KAIT); Nov. 4.007, 18.6 (Boles;
position end figures 24s.62, 06".4).  Additional magnitudes for
2005ip in NGC 2906:  1994 Feb. 9, [20.5 (DSS, blue, via Boles);
1999 Feb. 20, [21.0 (DSS, red); 2004 Dec. 6 and 2005 Jan. 21,
[19.5 (Boles); Nov. 5.261, 14.6 (C. Colesanti, C. Jacques, E.
Pimentel, and T. Napoleao, Belo Horizonte, Brazil); 5.682, 14.8 (K.
Itagaki, Yamagata, Japan; via S. Nakano, Sumoto; position end
figures 06s.40, 44".2).  Additional KAIT magnitudes for 2005iq in
MCG -03-1-8:  Oct. 9.22, [19.0; Nov. 6.21, 17.0.

SN      2005 UT      R.A.  (2000.0)  Decl.    Mag.     Offset
2005io  Nov. 3.47    5 50 24.64  +49 43 06.5  18.5  6".1 W, 17".6 N
2005ip  Nov. 5.163   9 32 06.42  + 8 26 44.4  15.5  2".8 E, 14".2 N
2005iq  Nov. 5.20   23 58 32.50  -18 42 33.0  17.2  8".6 E, 17".7 N

     A. V. Filippenko and R. J. Foley, University of California,
Berkeley, report that inspection of CCD spectra (range 330-920 nm),
obtained on Nov. 5 UT with the Keck I 10-m telescope (+ LRIS),
shows that SN 2005io is of type II, shortly after the explosion.
The broad hydrogen Balmer lines exhibit P-Cyg profiles, but in the
case of H_alpha the emission component greatly dominates over the
absorption component.  The continuum is very blue, and He I 587-nm
absorption is present.
     M. Modjaz, R. Kirshner, and P. Challis, Harvard-Smithsonian
Center for Astrophysics, report that a spectrogram (range 350-740
nm) of 2005ip, obtained by M. Calkins on Nov. 6.50 UT with the Mt.
Hopkins 1.5-m telescope (+ FAST), shows it to be a type-II
supernova, probably within a few weeks past explosion.  The
spectrum consists of a blue continuum (indicating a young age), the
P-Cyg line of H_alpha, and other absorption troughs.  Adopting a
recession velocity of 2440 km/s for the host galaxy (from Falco et
al. 1999, PASP 111, 438), the expansion velocity derived from the
minimum of the H_alpha line is 15400 km/s.  An absorption trough
observed at about 425.0 nm seems to be too blue to be identified
with H_beta.

                      (C) Copyright 2005 CBAT
2005 November 6                (8628)            Daniel W. E. Green

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