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IAUC 8712: COMET C/2006 K1 (McNAUGHT); C/2006 B5, C/2006 B6, C/2006 C1-C3, C/2006 D2

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IAUC number

                                                  Circular No. 8712
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)

     R. H. McNaught reports his discovery of a comet (discovery
observation tabulated below) on CCD images taken with the 0.5-m
Uppsala Schmidt telescope in the course of the Siding Spring Survey,
noting the object to be diffuse and extended 10" in p.a. 240 deg.
Deeper images taken by McNaught on May 17.8 UT show a strongly
condensed coma with a fan tail spanning about 50 deg.  Five stacked
1-min images taken by A. C. Gilmore with the Mt. John 0.6-m f/6.4
reflector on May 18.53-18.56 show a weakly condensed coma about 10"
in diameter and a short tail suspected to the west-northwest.

     2006 UT             R.A. (2000) Decl.       Mag.
     May  17.71978   22 53 07.97   -60 38 18.1   17.6

The available astrometry, the following very preliminary parabolic
orbital elements, and an ephemeris appear on MPEC 2006-K13.

     T = 2007 May  20.951 TT          Peri. =   7.358
                                      Node  =  48.990   2000.0
     q = 1.42581 AU                   Incl. =  46.843

COMETS C/2006 B5, C/2006 B6, C/2006 C1-C3, C/2006 D2 (SOHO)
     Additional Kreutz sungrazing comets have been found on SOHO
website images (cf. IAUC 8694).  C/2006 B5 and C/2006 C3 were
described by K. Battams as tiny, stellar, and extremely faint.
C/2006 B6, which was independently found by Q. Ye, was quite
condensed and slightly elongated, reaching mag 4.3 on Jan. 30.638
UT at about 10.8 solar radii.  C/2006 C1 was small and stellar,
reaching mag 6.4 on Feb. 8.404 at 12.4 solar radii.  C/2006 C2 was
elongated and peaked at mag about 5.5, but good photometry was not
possible due to a large data gap.  C/2006 D2 was very small and
faint in C3 images, and extremely faint and diffuse in C2 images.

 Comet        2006 UT       R.A.(2000)Decl.   Inst.  F    MPEC
 C/2006 B5    Jan. 26.821  20 51.6   -20 08   C3     RM   2006-J50
 C/2006 B6         29.821  21 12.8   -20 29   C3     KB   2006-J50
 C/2006 C1    Feb.  7.988  21 46.5   -16 41   C3     RM   2006-J50
 C/2006 C2          9.513  21 58.1   -16 53   C3     SF   2006-J50
 C/2006 C3         10.904  21 53.8   -15 25   C3     SF   2006-J51
 C/2006 D2         16.571  22 18.6   -14 08   C3/2   HS   2006-J51

                      (C) Copyright 2006 CBAT
2006 May 18                    (8712)            Daniel W. E. Green

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