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IAUC 8568: C/2005 N4; C/2005 N5

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IAUC number


                                                  Circular No. 8568
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/2005 N4 (CATALINA)
     An apparently asteroidal object discovered by the Catalina Sky
Survey, and posted on the 'NEOCP', has been found to show cometary
features by J. Young (Table Mountain, 0.6-m reflector), who notes
that his CCD frames taken on July 14.24-14.27 UT show a very
diffuse 5" coma with an extremely small starlike nuclear
condensation and no tail, adding that the object showed a "soft
appearance" on his observations from July 7-13.  P. Birtwhistle
(Great Shefford, England, 0.40-m f/6 reflector) reports that his
CCD frames taken on July 8.9 and 11.0 show the comet's image (FWHM)
to be slightly larger than those of nearby stars of similar
brightness.

     2005 UT             R.A. (2000) Decl.       Mag.
     July  6.27588   16 56 42.46   +33 40 50.2   19.1

The available astrometry, the following parabolic orbital elements,
and an ephemeris appear on MPEC 2005-N73.

     T = 2005 July  2.622 TT          Peri. = 136.426
                                      Node  =  63.847   2000.0
     q = 2.31107 AU                   Incl. = 116.715


COMET C/2005 N5 (CATALINA)
     Another apparently asteroidal object discovered by the
Catalina Sky Survey has been found to show cometary features by the
above observers.  CCD images by Birtwhistle on July 13.1 (in
twilight and poor seeing, at altitude 25 deg) and 14.1 UT show a
straight, thin tail of length 75" in p.a. 345 deg and a
concentrated coma of diameter 10".  Young adds that his frames
taken through thin cirrus clouds on July 14.4 show what appears to
be a 6" coma.

     2005 UT             R.A. (2000) Decl.       Mag.
     July 12.43721    0 52 02.90   + 4 49 40.2   17.2

The available astrometry, the following preliminary parabolic
orbital elements, and an ephemeris appear on MPEC 2005-N74.

     T = 2005 Aug. 20.959 TT          Peri. = 206.667
                                      Node  = 156.745   2000.0
     q = 1.64525 AU                   Incl. =  21.431

                      (C) Copyright 2005 CBAT
2005 July 14                   (8568)            Daniel W. E. Green

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