Central Bureau for Astronomical Telegrams

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IAUC 8313: C/2004 F2; P/2004 F3

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IAUC number 

                                                  Circular No. 8313
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 F2 (LINEAR)
     The LINEAR project reports the discovery of a comet with a
tail in p.a. approximately 235 deg on their images from Mar. 26.5
UT (discovery observation below).  Following posting on the NEO
Confirmation Page, P. Holvorcem reports that three co-added
unfiltered CCD images taken with the Tenagra 0.81-m telescope on
Mar. 29.48 show the object to be diffuse with a 10" coma.

     2004 UT             R.A. (2000) Decl.       Mag.
     Mar. 25.43956   18 26 21.07   - 4 24 10.0   18.4

The available astrometry, the following parabolic orbital elements,
and an ephemeris appear on MPEC 2004-F81.

     T = 2003 Dec. 26.945 TT          Peri. = 317.249
                                      Node  = 248.280   2000.0
     q = 1.43092 AU                   Incl. = 104.879


COMET P/2004 F3 (NEAT)
     The NEAT program reports the discovery of a comet on images
taken with the 1.2-m reflector at Haleakala (discovery observation
below), with a tail about 5" long toward the west.  Following WWW
posting on the NEO Confirmation Page, numerous observers have
reported on the object's cometary appearance on CCD images taken
during Mar. 28.9-29.4 UT, including F. Hormuth, J. Ticha and M.
Tichy, P. Kusnirak, B. L. Stevens, J. Young, and G. Hug -- the
object generally showing a coma diameter of 8"-30", total magnitude
as bright as 16, and a faint tail approximately 20"-40" long
spanning p.a. 240-285 deg.

     2004 UT             R.A. (2000) Decl.       Mag.
     Mar. 28.54336   13 43 27.00   +11 14 04.3   17.1

The available astrometry, the following elliptical orbital elements,
and an ephemeris appear on MPEC 2004-F82.  The comet passed about
0.37 AU from Jupiter in July 2001, causing the perihelion distance
to decrease.

     T = 2005 Jan.  7.465 TT          Peri. = 176.433
     e = 0.28517                      Node  =  78.867   2000.0
     q = 2.87248 AU                   Incl. =  16.009
       a =  4.01840 AU     n = 0.122356     P =   8.1 years

                      (C) Copyright 2004 CBAT
2004 March 29                  (8313)            Daniel W. E. Green

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