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IAUC 8347: C/2004 H6; 2004bx

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                                                  Circular No. 8347
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)
CBAT@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)


COMET C/2004 H6 (SWAN)
     Preliminary parabolic orbital elements from the CCD astrometry
on IAUC 8346 (magnitudes from H = 7.5, n = 3):

     T = 2004 May  12.716 TT          Peri. = 269.100
                                      Node  = 317.219   2000.0
     q = 0.77619 AU                   Incl. = 107.657

2004 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase   Mag.
May  25     3 28.40   -12 53.6   1.391   0.812   35.2   46.0    7.5
     30     3 19.57   -13 11.5   1.346   0.845   38.9   48.8    7.6
June  4     3 10.28   -13 21.6   1.291   0.887   43.2   51.5    7.7
      9     3 00.35   -13 25.7   1.227   0.936   48.2   54.0    7.7
     14     2 49.45   -13 25.1   1.156   0.991   53.8   55.9    7.8
     19     2 37.12   -13 21.5   1.079   1.050   60.0   57.0    7.8
     24     2 22.73   -13 15.6   0.998   1.112   67.0   57.3    7.8


SUPERNOVA 2004bx
     D. Magee, B. Holden, R. Bouwens, and G. Illingworth,
University of California, Santa Cruz; J. Blakeslee and H. Ford,
Johns Hopkins University, and the Advanced Camera for Surveys (ACS)
Science Team report the discovery of an apparent supernova in the
galaxy cluster CL 1358+62, observed in exposures obtained with the
Hubble Space Telescope's ACS Wide Field Camera with the F850LP
filter (at m_AB = 26.3 +/- 0.2; 'AB' magnitudes are defined by Oke
1974, Ap.J. Suppl. 27, 21) on Apr. 6.82 UT, with the F775W filter
(at m_AB = 25.67 +/- 0.06) on Apr. 7.81, with the F850LP filter (at
m_AB = 26.5 +/- 0.3) on May 6.62, and with the F625W filter (at
m_AB = 25.60 +/- 0.05) on May 7.19.  The new object is located at
R.A. = 13h59m51s.06, Decl. = +62o30'27".9 (equinox 2000.0), which
is 0".6 east and 0".5 north of the center of the brightest nearby
galaxy [having redshift 0.3174; cf.  Fabricant et al. (1991, Ap.J.
831, 33)].  It is not clear if the nearby galaxy is the host galaxy
or if the new object may reside in a background galaxy.  SN 2004bx
is not present in ACS observations from 2002 May 14 with the F775W
filter (5-sigma limiting m_AB 27.9) and with the F850LP filter
(5-sigma limiting m_AB 27.1).

                      (C) Copyright 2004 CBAT
2004 May 27                    (8347)            Daniel W. E. Green

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