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IAUC 8953: COMET C/2008 L2 (HILL); C/2008 C6, C/2008 C7, C/2008 C8, C/2008 C9

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IAUC number

                                                  Circular No. 8953
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://www.cfa.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)

COMET C/2008 L2 (HILL)
     R. E. Hill reports his discovery of a comet on CCD images
taken with the 0.68-m Catalina Schmidt telescope (discovery
observation tabulated below), four co-added 30-s exposures on June
12 showing the new object with a 5"-7" coma and a short, diffuse
tail in p.a. 270 deg in 2"-4" seeing; co-added images from June
13.4 UT show a cendensed 12"-14" coma with a 10" diffuse tail in
p.a. 290 deg, and co-added images from June 14.4 show a diffuse,
fan-shaped tail about 20" long in p.a. 250 deg.  Following posting
on the Minor Planet Center's 'NEOCP' webpage, J. M. Aymami (Tiana,
Spain, 0.25-m reflector) writes that co-added CCD images from June
13.1 show a quasi-stellar object with a faint tail 35" long in p.a.
256 deg.

     2008 UT             R.A. (2000) Decl.       Mag.
     June 12.44006   23 40 43.93   +22 42 02.7   18.3

The available astrometry, the following preliminary parabolic
orbital elements, and an ephemeris appear on MPEC 2008-L55.

     T = 2008 July 27.949 TT          Peri. = 130.899
                                      Node  = 222.914   2000.0
     q = 2.50913 AU                   Incl. =  25.341

COMETS C/2008 C6, C/2008 C7, C/2008 C8, C/2008 C9 (SOHO)
     Further to IAUC 8933, additional apparent comets have been
found on SOHO website images; all are Kreutz sungrazers except for
C/2008 C9 (non-group).  C/2008 C6 (mag 7.5) and C/2008 C7 (mag 7)
were both stellar in appearance.  C/2008 C8 reached mag about 5.5
and appeared teardrop-shaped in C3 images, while it was a very
faint, thin streak in C2 images.  C/2008 C9 was marginally diffuse
and very small (mag about 7.5).  An asterisk in the instrumentation
column below indicates that astrometry was also obtained from
STEREO-A/SECCHI HI1 images (see IAUC 8926).

 Comet        2008 UT       R.A.(2000)Decl.   Inst.  F    MPEC
 C/2008 C6    Feb.  7.696   21 36.9  -16 16   C3*    BZ   2008-L18
 C/2008 C7          9.196   21 47.1  -16 17   C3*    HS   2008-L18
 C/2008 C8         14.821   22 17.9  -15 38   C3/2   JS   2008-L18
 C/2008 C9         15.063   21 53.3  -11 33   C2     RK   2008-L18

                      (C) Copyright 2008 CBAT
2008 June 14                   (8953)            Daniel W. E. Green

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