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IAUC 8332: P/2004 H3; 2004am; C/2001 Q4

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IAUC number

                                                  Circular No. 8332
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)

     J. A. Larsen, Lunar and Planetary Laboratory, University of
Arizona, reports the discovery of a comet on Spacewatch CCD images
taken with the 0.9-m f/3 reflector at Kitt Peak (discovery
observation below), reporting a 17" tail in p.a. 280 deg.
Following posting on the NEO Confirmation Page, J. E. McGaha
(Tucson, AZ, 0.62-m f/5.1 reflector) reported that his stacked
3-min CCD frames taken on Apr. 24.22 UT show a soft coma with
diameter 6" and a 8" tail in p.a. 270 deg.

     2004 UT             R.A. (2000) Decl.       Mag.
     Apr. 22.32787   14 48 21.99   -17 10 23.4   19.2

The available astrometry, the following preliminary elliptical
orbital elements, and an ephemeris appear on MPEC 2004-H66.

     T = 2004 Feb. 29.472 TT          Peri. = 343.313
     e = 0.39907                      Node  = 221.067   2000.0
     q = 2.50394 AU                   Incl. =  26.845
       a =  4.16676 AU     n = 0.115880     P =   8.51 years

     R. J. Beswick, T. W. B. Muxlow, M. K. Argo, and A. Pedlar,
Jodrell Bank Observatory, report multi-frequency upper limits on
the early radio emission from SN 2004am (cf. IAUC 8297, 8299), as
part of their ongoing radio supernova monitoring program of nearby
starburst galaxies.  Very Large Array (VLA) B-configuration snap-
shot observations on 2003 Nov. 14 place 3-sigma upper limits for
this source of 0.34 mJy/bm (8.4 GHz) and 1 mJy/bm (15 GHz) at the
reported position.  MERLIN observations at 5 GHz on 2004 Mar. 9
provide a limit of 0.18 mJy/bm (3 sigma), some 109 days after its
first optical identification.  If SN 2004am is a type-II supernova
(as suspected from it optical spectrum), a significant delay (up to
about 1 year) may be expected before the radio emission peak.
Continued radio monitoring of this source is underway with MERLIN
and the VLA.

COMET C/2001 Q4 (NEAT)
     Visual total-magnitude estimates:  Apr. 15.40 UT, 4.7 (D. A.
J. Seargent, Cowra, N.S.W., naked eye); 18.88, 4.8 (A. Pearce,
Nedlands, W. Australia, 8x40 binoculars); 22.89, 4.5 (W. Souza, Sao
Paulo, Brazil, 8x30 binoculars); 23.90, 4.3 (A. Amorim,
Florianopolis, Brazil, 7x50 binoculars).

                      (C) Copyright 2004 CBAT
2004 April 24                  (8332)            Daniel W. E. Green

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