IAU Central Bureau for Astronomical Telegrams

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IAUC 8421: C/2004 T3; C/2004 U1

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IAUC number


                                                  Circular No. 8421
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 T3
     An object discovered at Siding Spring on 0.5-m Uppsala Schmidt
telescope CCD images by R. H. McNaught (discovery observation below)
has been found (after posting on the 'NEO Confirmation Page') to be
diffuse on CCD images taken at Las Campanas with the 0.36-m 'SoTIE'
reflector by G. Masi, F. Mallia, and R. Wilcox on Oct. 13, 17, and
21.  Ten combined 1-min exposures taken on Oct. 13.1 UT show a
slightly diffuse object with diameter about 15" (slightly elongated
northwest-southeast) with an apparent condensation in the northwest
part of the coma; images taken on Oct. 17.3 show a possible 5" tail
in p.a. 10 deg.

     2004 UT             R.A. (2000) Decl.       Mag.
     Oct. 12.69016    3 16 05.77   -59 40 24.5   18.7

The available astrometry, the following preliminary orbital
elements, and an ephemeris appear on MPEC 2004-U24.

     T = 2004 Nov. 11.633 TT          Peri. = 289.478
                                      Node  =  47.909   2000.0
     q = 9.55852 AU                   Incl. =  72.760


COMET C/2004 U1 (LINEAR)
     An apparently asteroidal object discovered by LINEAR
(discovery observation below) has been found to show a faint
coma on CCD images taken on Oct. 20.1 UT by A. Knoefel
(Schoenbrunn, Germany; 0.5-m f/5 reflector).  CCD images taken
by P. Birtwhistle (Great Shefford, U.K.; 0.30-m f/6.3 reflector)
on Oct. 21.2 show the object to be possibly diffuse with
diameter 9" and a possible broad tail 12" long in p.a. 320 deg.

     2004 UT             R.A. (2000) Decl.       Mag.
     Oct. 19.41854    8 56 12.68   +20 30 21.8   19.4

The available astrometry (including prediscovery LONEOS
observations from Oct. 16), the following preliminary orbital
elements, and an ephemeris appear on MPEC 2004-U25.

     T = 2004 Dec.  4.319 TT          Peri. =  18.566
                                      Node  = 112.608   2000.0
     q = 2.68042 AU                   Incl. = 130.288

                      (C) Copyright 2004 CBAT
2004 October 21                (8421)            Daniel W. E. Green

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