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Circular No. 8337 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 HV_60 (SPACEWATCH) 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. COMET C/2002 T7 (LINEAR) 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; moonlight). (C) Copyright 2004 CBAT 2004 May 9 (8337) Daniel W. E. Green
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