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IAUC 8542: 2005ck; 2005ci; Var STAR IN Nor

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IAUC number

                                                  Circular No. 8542
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)

     Independent discoveries of a supernova in the Abell galaxy
cluster 1656 have been reported on unfiltered CCD images by H. Pugh
and W. Li (LOSS/KAIT; cf. IAUC 8541) and by R. Quimby, F. Castro,
P. Hoeflich, J. C. Wheeler (all at the University of Texas), and C.
Gerardy (of Imperial College); Quimby's group used the ROTSE-IIIb
telescope (cf. IAUC 8508).  Pugh and Li provide the following
precise position for SN 2005ck:  R.A. = 13h02m18s.72, Decl. =
+28o20'45".5 (equinox 2000.0), which is 58".3 east and 24".3 south
of the center of an apparent host galaxy.  Quimby et al. report
position end figures 18s.77, 43".8 for the new object.  Approximate
magnitudes for SN 2005ck:  2004 Dec. 15, [18.8 (ROTSE-IIIb); 2005
Jan. 14, [18.8 (ROTSE-IIIb); Apr. 17.26 UT, [19.5 (KAIT); May 23.25,
[18.5 (KAIT); June 1.26, 19.0: (KAIT; hint of object near limit of
image); 5.27, 18.7 (ROTSE-IIIb); 8.25, 18.6 (ROTSE-IIIb); 12.24,
18.6 (KAIT); 13.24, 18.5 (KAIT).  Quimby adds that a spectrum
(range 420-890 nm) of SN 2005ck, obtained on June 13.22 with the
9.2-m Hobby-Eberly Telescope (+ Marcario Low-Resolution
Spectrograph) by S. C. Odewhan and E. Terrazas, shows it to be a
type-Ia supernova; the spectrum is very similar to that of SN 1994D
near maximum light (Patat et al. 1996, MNRAS 278, 111).  Using
1994D as a template, they find an approximate redshift of z = 0.08,
ruling out any association to the neighboring Coma-cluster galaxies,
leaving the host as yet unidentified.

SUPERNOVA 2005ci IN NGC 5682
     M. Modjaz, R. Kirshner, and P. Challis, Harvard-Smithsonian
Center for Astrophysics, report that a spectrogram (range 340-740
nm) of SN 2005ci (cf. IAUC 8541), obtained by M. Calkins on June
12.34 UT with the F. L. Whipple Observatory 1.5-m telescope (+
FAST), shows it to be a type-II supernova.  The spectrum consists
of a flat continuum and P-Cyg lines of H_alpha and H_beta.
Adopting the NED recession velocity of 2291 km/s for the host
galaxy (from Falco et al. 1999, PASP 111, 438), the expansion
velocity derived from the minimum of the H_beta line is about 13000

     Further to IAUC 8540, S. Laloe (Centre de Donnees de
Strasbourg) writes that the so-called USNO-A1.0 star of red mag
18.4 is actually a USNO-B1.0 star.

                      (C) Copyright 2005 CBAT
2005 June 13                   (8542)            Daniel W. E. Green

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