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IAUC 8039: COMET C/2002 Y1 (JUELS-HOLVORCEM); C/2002 X3, C/2002 X4

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                                                  Circular No. 8039
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/2002 Y1 (JUELS-HOLVORCEM)
     A comet has been found on CCD images (discovery observation
below) taken with a 0.12-m f/5.0 refractor by Charles W. Juels
(Fountain Hills, AZ) and Paulo R. Holvorcem (Campinas, Brazil).
Holvercem reports that co-adding five 45-s and one 90-s exposures
taken around Dec. 28.5 UT reveals a coma 1'.8 in diameter.
Following posting on the NEO Confirmation Page, several other
observers reported on the cometary appearance of the object,
including D. T. Durig (Sewanee, TN), who noted that 300-s CCD
exposures with a 0.3-m reflector show an inner coma of diameter 30"
and a wider, diffuse glow of diameter 2'.5.

     2002 UT             R.A. (2000) Decl.        m1
     Dec. 28.43892   13 24 01.30   +16 49 16.3   15.1

Additional astrometry and the following very preliminary parabolic
orbital elements appear on MPEC 2002-Y50:

     T = 2003 Apr. 10.532 TT          Peri. = 131.057
                                      Node  = 166.893   2000.0
     q = 0.67088 AU                   Incl. = 106.303

2002/03     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
Dec. 12    12 56.63   +12 10.2   2.280   2.194   72.4   25.3   16.2
     17    13 04.29   +13 17.1   2.134   2.125   76.1   26.7   15.9
     22    13 12.47   +14 38.4   1.987   2.055   79.8   28.1   15.6
     27    13 21.32   +16 17.1   1.842   1.985   83.4   29.5   15.3
Jan.  1    13 31.02   +18 17.1   1.698   1.915   86.8   30.8   15.0
      6    13 41.85   +20 43.0   1.558   1.844   90.1   32.2   14.6
     11    13 54.19   +23 40.3   1.424   1.772   93.0   33.7   14.3
     16    14 08.66   +27 15.3   1.296   1.700   95.5   35.2   13.9
     21    14 26.15   +31 34.3   1.178   1.627   97.2   36.9   13.5


COMETS C/2002 X3 AND C/2002 X4 (SOHO)
     D. Hammer provides magnitudes from SOHO images (taken with an
orange filter) for the comets reported on IAUC 8032:  C/2002 X3,
Dec. 4.185 UT, 9.2 +/- 0.8; 4.202, 8.5 +/- 0.5; 4.213, 8.6 +/- 0.6;
4.247, 8.4 +/- 0.6.  C/2002 X4, Dec. 4.285, 7.3 +/- 0.2; 4.309, 7.4
+/- 0.2; 4.338, 8.2 +/- 0.5; 4.352, 7.9 +/- 0.4.

                      (C) Copyright 2002 CBAT
2002 December 29               (8039)            Daniel W. E. Green

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