[IAUC] IAUC 9030: COMET C/2009 F2 (McNAUGHT); C/2008 W11, C/2009 W12, C/2008 X5, C/2008 X6; 216P [25139-2009/08-R1]

Vie Mar 20 15:05:26 ART 2009

                                                  Circular No. 9030
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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COMET C/2009 F2 (McNAUGHT)
     R. H. McNaught reports his discovery of another comet on CCD
images taken with the 0.5-m Uppsala Schmidt telescope at Siding
Spring (discovery observation tabulated below), the object
appearing well condensed with a 12" coma and a possible very weak
15" tail in p.a. 260 deg (involved with stars).  Follow-up
observations by McNaught on Mar. 20.49 UT show a 9" coma and no
tail.  Following posting on the Minor Planet Center's 'NEOCP'
webpage, R. Ligustri (Udine, Italy) reports that seven co-added
180-s CCD exposures (taken remotely with a 0.35-m f/7 telescope at
Grove Creek Observatory, Trunkey, N.S.W., Australia on Mar. 20.6)
show a coma diameter of about 18".

     2009 UT             R.A. (2000) Decl.       Mag.   Observer
     Mar. 19.57501   10 57 44.69   -43 26 24.7   17.7   McNaught

The available astrometry, the following preliminary parabolic
orbital elements, and an ephemeris appear on MPEC 2009-F47.

     T = 2009 Nov. 20.793 TT          Peri. = 338.758
                                      Node  = 219.860   2000.0
     q = 5.18492 AU                   Incl. =  54.120

COMETS C/2008 W11, C/2009 W12, C/2008 X5, C/2008 X6 (SOHO)
     Further to IAUC 9028, additional presumed comets have been
found on SOHO website images.  C/2008 W11 and C/2008 W12 were
slightly diffuse Kreutz sungrazers (peak magnitudes about 8 and 8.5,
respectively).  C/2008 X5 (Meyer group) and C/2008 X6 (Marsden
group) were both small and stellar in appearance (mag about 7.5).

 Comet        2008 UT       R.A.(2000)Decl.   Inst.  F    MPEC
 C/2008 W11   Nov. 29.921   16 24.0  -23 25   C2     EB   2009-C57
 C/2008 W12        29.963   16 24.4  -23 23   C2     RM   2009-E60
 C/2008 X5    Dec.  7.022   16 56.8  -23 57   C2     RK   2008-Y06
 C/2008 X6          7.504   16 53.5  -22 17   C2     RK   2008-Y06

COMET 216P/LINEAR
     Further to IAUCs 9005, 9010, and 9020, comet P/2009 D1 =
P/2001 CV_8 (cf. IAUC 9021) has been given the permanent number
216P.  (See also MPC 65277.)

                      (C) Copyright 2009 CBAT
2009 March 20                  (9030)            Daniel W. E. Green