[IAUC] IAUC 9020: COMET C/2007 N3 (LULIN); C/2008 T11, C/2008 T12,, C/2008 U2-U4; 213P [25139-2009/08-R1]

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                                                  Circular No. 9020
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/2007 N3 (LULIN)
     M. R. Combi, University of Michigan: J.-L. Bertaux and E.
Quemerais, Service d'Aeronomie, Centre National de la Recherche
Scientifique and Universite de Versailles Saint-Quentin en Yvelines;
and J. T. T. Maekinen, Finnish Meteorological Institute, note that
the Solar Wind Anisotropies (SWAN) camera on the Solar and
Heliospheric Observatory (SOHO) spacecraft, located at the
earth-sun L_1 Lagrange point, makes daily full-sky images of
hydrogen Lyman_alpha.  SWAN detected comet C/2007 N3 from Jan. 20
to 30.  The following water-production rates (given in units of
10^(27) s**-1) were determined from the hydrogen Lyman_alpha
brightness and distribution:  Jan. 20.5 UT, 98; Jan. 21.5, 98; Jan.
22, 100; Jan. 23.5, 120; Jan. 24.5, 110; Jan. 25.5, 79; Jan. 26.5,
120; Jan. 27.5, 79; Jan. 28.5, 77; Jan. 29.5, 84; Jan. 30.5, 79.
Calibration, background subtraction, and model parameters
contribute to a realistic absolute uncertainty of about 30 percent
(there are uncertainties from the instrument noise and formal model
inversion).


COMETS C/2008 T11, C/2008 T12, AND C/2008 U2-U4 (SOHO)
     Further to IAUC 9018, additional Kreutz sungrazers have been
found on SOHO website images.  C/2008 T11 was small and stellar in
appearance (mag about 7-7.5) in C3 images, but diffuse and faint
with no tail in C2 images.  C/2008 T12 was very small, diffuse, and
elongated (mag about 8).  C/2008 U2 was small and stellar in
appearance (mag about 7).  C/2008 U3 was slightly diffuse (mag
about 8-8.5).  C/2008 U4 was slightly diffuse, appearing small (mag
about 7) in C3 images with a short, diffuse tail in C2 images.

 Comet        2008 UT       R.A.(2000)Decl.   Inst.  F    MPEC
 C/2008 T11   Oct. 13.638   13 01.3  - 9 32   C3/2   HS   2009-A59
 C/2008 T12        14.313   13 11.3  - 9 13   C2     RK   2009-A59
 C/2008 U2         16.521   13 19.8  -10 06   C2     EB   2009-B66
 C/2008 U3         16.788   13 21.3  -10 09   C2     RM   2009-B66
 C/2008 U4         16.863   13 08.1  -11 06   C3/2   RM   2009-B66


COMETS 213P/VAN NESS, 214P/LINEAR, AND 215P/NEAT
     Comet P/2009 B3 = P/2005 R2 (cf. IAUC 9017) has been assigned
the permanent designation 213P.  Comet P/2009 B4 = P/2002 CW_134
(cf. IAUC 9017) has been assigned the permanent designation 214P.
Comet P/2009 B5 = P/2002 O8 (cf. IAUC 9018) has been assigned the
permanent designation 215P.  See also MPC 64980.

                      (C) Copyright 2008 CBAT
2009 February 18               (9020)            Daniel W. E. Green