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IAUC 9080: COMET C/2009 T1 (McNAUGHT); C/2009 G7, C/2009 G8, C/2009 H3

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IAUC number 

                                                  Circular No. 9080
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://www.cfa.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)


COMET C/2009 T1 (McNAUGHT)
     R. H. McNaught reports his discovery of a comet with a diffuse
14" coma and a diffuse 0'.6 tail in p.a. 145 deg on CCD images
taken with the 0.5-m Uppsala Schmidt telescope (discovery
observation tabulated below).  After posting on the Minor Planet
Center's 'NEOCP' webpage, other CCD astrometrists also have
commented on the object's cometary appearance.  A. C. Gilmore and
P. M. Kilmartin (Mt. John 1.0-m reflector, Oct. 10.7 UT) note a 30"
tail in p.a. 140 deg.  R. Ligustri, Udine, Italy, reports that his
co-added images (taken remotely with an RAS Observatory 0.40-m
reflector near Moorook, Australia; Oct. 10.7) show a coma of
diameter about 12" and a thin 20" tail in p.a. 167 deg.  D.
Chestnov, Moscow, writes that his images (taken remotely with a
0.15-m refractor at the Tzec Maun Observatory, near Pingelly, W.
Australia; Oct. 10.7) show a small 10" coma with a short tail in
p.a. 185 deg and a nuclear condensation elongated in p.a. 140 deg.
C. Jacques and E. Pimentel (Belo Horizonte, MG, Brazil, 0.30-m
reflector, Oct. 11.3) find an 18" coma in fifty 30-s stacked
exposures.

     2009 UT             R.A. (2000) Decl.       Mag.   Observer
     Oct.  9.74900    6 11 14.33   -58 50 27.8   17.8   McNaught

The available astrometry, the following preliminary parabolic
orbital elements, and an ephemeris appear on MPEC 2009-T36.

     T = 2010 Mar. 25.069 TT          Peri. = 300.574
                                      Node  =  59.778   2000.0
     q = 5.56975 AU                   Incl. =  88.081


COMETS C/2009 G7, C/2009 G8, C/2009 H3 (SOHO)
     Further to IAUC 9079, additional presumed comet have been
found on SOHO website images.  K. Battams reports that C/2009 G7, a
Kreutz sungrazer, was stellar in appearance and tiny (mag about 7)
in C3 images, and small and condensed in C2 images.  C/2009 G8, a
non-group comet, was slightly diffuse and elongated (mag about
7-7.5).  C/2009 H3, also a Kreutz sungrazer, was diffuse and
elongated (mag about 8).

 Comet        2009 UT       R.A.(2000)Decl.   Inst.  F    MPEC
 C/2009 G7    Apr. 13.488    1 44.8  + 6 34   C3/2   AK   2009-N33
 C/2009 G8         13.963    1 33.2  +11 20   C2     BZ   2009-N33
 C/2009 H3         18.504    1 51.9  + 9 46   C2     MK   2009-N33

                      (C) Copyright 2009 CBAT
2009 October 11                (9080)            Daniel W. E. Green

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