[IAUC] IAUC 8910: C/2007 S5-S10, C/2007 T7-T11; 29P [25139-2008/05-R1]

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                                                  Circular No. 8910
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
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Phone 617-495-7440/7244/7444 (for emergency use only)


COMETS C/2007 S5-S10 AND C/2007 T7-T11 (SOHO)
     Further to IAUC 8896, additional Kreutz-sungrazing comets have
been found on SOHO website images, as tabulated below.  C/2007 S5
was bright (mag 4) and teardrop-shaped in C3-coronagraph images; C2
images showed a long (0.75-deg), thin tail.  C/2007 S6, C/2007 S8,
C/2007 S9, and C/2007 T8 were described by K. Battams as tiny and
stellar in appearance (mag about 7, except mag 7.5 for C/2007 S8)
in C3 images; C2 images showed C/2007 S6 and C/2007 S8 to be very
faint and diffuse, while C/2007 S9 was "fuzzy" and faint, and
C/2007 T8 was diffuse.  C/2007 S7 appeared very diffuse and faint
(mag 8).  C/2007 S10 and C/2007 T7 were also small and stellar in
appearance (mag about 6) in C3 images, with the former being
diffuse and the latter a bit diffuse with a hint of tail in C2
images.  C/2007 T9 (also found by R. Matson and T. Hoffman) was
small and stellar in appearance (mag 6.5) in C3 images, and diffuse
with a hint of tail in C2 images.  C/2007 T10 was stellar in
appearance (mag 7) in C3 images, and diffuse in C2 images.  C/2007
T11 was very faint (mag about 8) and diffuse.

 Comet       2007 UT       R.A.(2000)Decl.   Inst.  F    MPEC
 C/2007 S5   Sep. 26.654   11 41.2  - 2 48   C3/2   RM   2008-A40
 C/2007 S6        28.263   12 04.0  - 2 39   C3/2   HS   2008-A40
 C/2007 S7        28.704   12 11.4  - 2 44   C2     HS   2008-A40
 C/2007 S8        29.263   12 05.4  - 3 11   C3/2   HS   2008-A40
 C/2007 S9        29.471   12 06.0  - 3 25   C3/2   HS   2008-A40
 C/2007 S10       30.013   12 02.8  - 3 57   C3/2   BZ   2008-A40
 C/2007 T7   Oct.  4.696   12 22.7  - 5 44   C3/2   RM   2008-A41
 C/2007 T8        10.471   12 45.1  - 7 58   C3/2   RM   2008-A41
 C/2007 T9        10.821   12 44.5  - 8 19   C3/2   BZ   2008-A41
 C/2007 T10       11.071   12 51.0  - 8 01   C3/2   HS   2008-A50
 C/2007 T11       13.456   13 05.7  - 8 36   C2     HS   2008-A50


COMET 29P/SCHWASSMANN-WACHMANN
     This comet appears to be undergoing an outburst in brightness,
as indicated by the following visual total-magnitude estimates:
2007 Dec. 9.73 UT, 14.5 (S. Yoshida, Gunma, Japan, 0.40-m reflector);
31.10, 12.9 (M. Goiato, Aracatuba, Brazil, 0.22-m reflector); 2008
Jan. 3.87, 12.2 (J. J. Gonzalez, Asturias, Spain, 0.20-m reflector);
4.43, 12.8 (Yoshida); 11.89, 11.8 (M. L. Paradowski, Poleski
National Park, Poland, 0.20-m reflector); 13.83, 11.4 (Gonzalez);
14.90, 11.3 (V. Nevski, Vitebsk, Belarus, 0.3-m reflector).

                      (C) Copyright 2008 CBAT
2008 January 15                (8910)            Daniel W. E. Green