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IAUC 8530: 2005ca, 2005cb; C/2005 F5, C/2005 G3-G6

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                                                  Circular No. 8530
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)

SUPERNOVA 2005ca AND 2005cb
     Further to IAUC 8513, M. SubbaRao, University of Chicago and
Adler Planetarium, on behalf of the SDSS Collaboration, reports the
discovery of a supernova in spectra taken on May 12.19 UT.  SN
2005ca is located at R.A. = 13h32m38s.59, Decl. = +11o48'33".2
(equinox 2000.0), which is coincident with the center of the host
galaxy whose redshift is z = 0.150.  The new object appears to be a
type-Ia supernova with an approximate age of 8 +/- 5 days after
maximum light, and its estimated magnitude is r = 20.9 +/- 0.2 (the
host galaxy has apparent mag r = 17.85 from an image taken prior to
the supernova event on 2003 Mar. 31).
     Further to IAUC 8499, C. Jacques reports the discovery of an
apparent supernova (mag 15.6) by C. Colesanti, E. Pimentel, T.
Napoleao and himself on unfiltered CCD images taken in the course
of the Brazilian Supernovae Search on May 13.22 and 16.12 UT.  SN
2005cb is located at R.A. = 19h11m21s.95, Decl. = -57o02'27".4
(equinox 2000.0), which is 16" west and 19" north of the center of
NGC 6753.  Nothing in visible at this location on a CCD image taken
on May 2.23 (limiting mag 18.5); a faint H II region is very close
to the supernova position on that image and on a red Palomar Sky
Survey image from 1976.

COMETS C/2005 F5 AND C/2005 G3-G6 (SOHO)
     Following are the initial available positions for additional
Kreutz sungrazing comets found on SOHO website images (continuation
to IAUC 8529; CL = C. Liang), with the following notes by K.
Battams (as usual).  C/2005 F5 was too diffuse to discern any tail;
it reached mag about 7.0 at 7.3 solar radii (Mar. 28.692).  C/2005
G3 was stellar in appearance with no tail in the C3 images,
reaching mag 6.2 at 9.4 solar radii (Apr. 4.279); C2 images showed
a very short tail.  C/2005 G4 was tiny and stellar in appearance,
reaching roughly mag 7.5.  C/2005 G5 and G6 showed no tail and were
too diffuse for accurate photometry (though peak brightness was
around mag 7).

 Comet       2005 UT       R.A.(2000)Decl.  Inst.  F    MPEC
 C/2005 F5   Mar. 28.692   0 37.9  + 2 42    C2    BZ   2005-J25
 C/2005 G3   Apr.  3.904   1 07.5  + 3 29    C3/2  XL   2005-J25
 C/2005 G4         8.160   1 15.4  + 6 20    C2    HS   2005-J25
 C/2005 G5         9.935   1 22.8  + 7 09    C2    CL   2005-J25
 C/2005 G6        11.685   1 29.7  + 7 44    C2    BZ   2005-J25

                      (C) Copyright 2005 CBAT
2005 May 16                    (8530)            Daniel W. E. Green

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