Circular No. 8542

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) BMARSDEN@CFA.HARVARD.EDU or DGREEN@CFA.HARVARD.EDU (science) URL http://cfa-www.harvard.edu/iau/cbat.html Phone 617-495-7244/7440/7444 (for emergency use only)

SUPERNOVA 2005ck

 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.

Host galaxy info: vel = 8631 km/s, 0.4 x 0.2, 16.41, SAB0/a

SN type info: Ia

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