[IAUC] IAUC 8841: C/2007 K6; C/2007 K5; C/2007 JA_21 [25139-2008/05-R1]

Vie Jun 22 16:58:42 ART 2007

                                                  Circular No. 8841
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS en CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT en CFA.HARVARD.EDU (science)
URL http://www.cfa.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)

COMET C/2007 K6 (McNAUGHT)
     R. H. McNaught reports his discovery of another comet on 0.5-m
Uppsala Schmidt telescope images obtained in the course of the
Siding Spring Survey (discovery observation tabulated below), the
object displaying a marginal coma of diameter about 6".  Additional
images by McNaught on May 30.8 UT show an almost, but-not-quite-
asteroidal appearance in excellent seeing, the coma diameter given
as 4" (FWHM).

     2007 UT             R.A. (2000) Decl.       Mag.
     May  27.79676   22 50 33.10   -42 40 59.9   18.9

The available astrometry, the following preliminary parabolic
orbital elements, and an ephemeris appear on MPEC 2007-K82.

     T = 2007 June 21.950 TT          Peri. = 334.978
                                      Node  = 298.186   2000.0
     q = 3.46556 AU                   Incl. = 105.095

COMET C/2007 K5 (LOVEJOY)
     Additional precise astrometry of this comet (cf. IAUC 8840)
has been published on MPEC 2007-K80, where the following
preliminary parabolic orbital elements also appear:

     T = 2007 Apr. 26.977 TT          Peri. = 250.115
                                      Node  = 191.798   2000.0
     q = 1.12113 AU                   Incl. =  65.141

COMET C/2007 JA_21 (LINEAR)
     Further to IAUC 8837, J. Young reports that his CCD images
taken on May 14.29-14.36 UT with the Table Mountain 0.61-m f/16
Cassegrain reflector show a coma of diameter 5"-6" that was
slightly elongated along the comet's path of motion, with a faint
fan-shaped tail extending 20" spanning p.a. 315-25 deg.  Improved
orbital elements from MPEC 2007-K78:

     T = 2006 Nov. 10.980 TT          Peri. =  93.308
                                      Node  =  65.556   2000.0
     q = 5.35972 AU                   Incl. =  89.825

                      (C) Copyright 2007 CBAT
2007 May 31                    (8841)            Daniel W. E. Green