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IAUC 8475: 2005W; 2005U; C/2004 Y9-Y11, C/2005 B2

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IAUC number

                                                  Circular No. 8475
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)

     S. Nakano, Sumoto, Japan, reports the discovery by Yoji Hirose
(Chigasaki, Kanagawa-ken, Japan) of an apparent supernova (mag 15.2)
on eight unfiltered CCD frames taken on Feb. 1.442 UT with a 0.35-m
f/6.8 Schmidt-Cassegrain reflector.  Nakano has measured the
position of SN 2005W from one of Hirose's images:  R.A. =
1h50m45s.75, Decl. = +21o45'35".6 (equinox 2000.0), which is 56"
east and 1" south of the center of NGC 691.  Hirose adds that
nothing is visible at this location on frames taken by himself on
Jan. 11, 21, and 24 (limiting mag 16.5-17) or on Digitized Sky
Survey images.  There is also a foreground star of mag 17.6 at
position end figures 45s.46, 38".6.  W. Li, University of
California, reports that a KAIT image taken on Feb. 2.18 shows the
new object at mag 14.7, but nothing was visible at this location on
a KAIT image from Jan. 23.20 (limiting mag 19.0); Li provides
position end figures 45s.77, 35".4 for SN 2005W.

     M. Modjaz, R. Kirshner, and P. Challis, Harvard-Smithsonian
Center for Astrophysics, report that a spectrogram (range 350-740
nm) of SN 2005U (cf. IAUC 8473), obtained by P. Berlind on Feb.
1.51 UT with the F. L. Whipple Observatory 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
and Balmer-line P-Cyg features with heavy host-galaxy light
contamination.  Adopting the NED recession velocity of 3088 km/s
for the host galaxy, the expansion velocity derived from the
minimum of the H_beta line is about 10000 km/s.

COMETS C/2004 Y9-Y11 AND C/2005 B2 (SOHO)
     Further to IAUC 8471, following are the initial observations
of additional comets found on SOHO website images (Kreutz
sungrazers except for C/2004 Y10).

 Comet       2004 UT      R.A.(2000)Decl.   Inst.  F    MPEC
 C/2004 Y9   Dec. 28.034  18 35.2  -24 35   C2     XG   2005-B62
 C/2004 Y10       28.508  18 37.5  -22 16   C2     TH   2005-B62
 C/2004 Y11       28.866  18 39.8  -25 20   C3/2   HS   2005-B62

 Comet       2005 UT      R.A.(2000)Decl.   Inst.  F    MPEC
 C/2005 B2   Jan. 25.471  20 46.7  -20 26   C3     KC   2005-B62

                      (C) Copyright 2005 CBAT
2005 February 2                (8475)            Daniel W. E. Green

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