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IAUC 8337: C/2004 HV_60; 2004bl; C/2002 T7

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IAUC number

                                                  Circular No. 8337
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)

     An apparently asteroidal object discovered by the Spacewatch
survey (discovery observation below from MPS 106357 and MPEC
2004-H91) has been reported by D. J. Tholen, University of Hawaii
(UH), to be cometary on two 400-s R exposures taken on May 8.3 UT
by F. Bernardi, J. Pittichova, and N. Moskovitz with the UH 2.24-m
telescope on Mauna Kea.  There is a faint tail approximately 55"
long in p.a. about 24 deg and a hint of a second, fainter tail
almost 15" long in p.a. 310 deg.  The measured PSF widths of the
comet head are 1".03 and 0".95 in the two images, while the widths
of 55 trailed astrometric reference stars in the images range from
0".90 to 1".09, not sufficient to resolve the presence of a coma.
R. H. McNaught reports that images obtained on Apr. 30.6 at Siding
Spring also suggest a slightly soft image for the comet.

     2004 UT             R.A. (2000) Decl.       Mag.
     Apr. 25.34519   15 06 21.20   -16 58 40.9   21.4

     Additional astrometry, the following preliminary parabolic
orbital elements, and an ephemeris appear on MPEC 2004-J34.

     T = 2003 Dec. 21.526 TT          Peri. = 149.127
                                      Node  =  44.849   2000.0
     q = 3.10499 AU                   Incl. =  93.488

SUPERNOVA 2004bl IN MCG +00-31-42
     G. H. Marion and C. L. Gerardy, University of Texas at Austin,
report that a low-resolution optical spectrogram (resolution 300;
range 410-1000 nm) of SN 2004bl (cf. IAUC 8334), obtained on May
8.16 UT with the 9.2-m Hobby-Eberly Telescope (+ Marcario Low-
Resolution Spectrograph) by S. Odewahn and M. Graver, shows it to
be a type-Ia supernova within a few days of maximum light; adopting
the NED redshift of 5192 km/s for MCG +00-31-42, the expansion
velocity of the Si II feature (rest wavelength 635.5 nm) is found
to be 11300 km/s.

     Visual total-magnitude estimates:  Apr. 29.87 UT, 4.1 (A.
Pearce, Noble Falls, W. Australia, 8x40 binoculars; 7.6-deg tail);
May 2.79, 3.8 (D. A. J. Seargent, The Entrance, N.S.W., naked eye);
9.35, 3.6 (A. Amorim, Florianopolis, Brazil, 7x50 binoculars;

                      (C) Copyright 2004 CBAT
2004 May 9                     (8337)            Daniel W. E. Green

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