[IAUC] IAUC 8819: COMET 2007 E2; C/2006 X11, C/2006 Y3-Y9 [25139-2007/05-R1]

Vie Jun 22 17:00:49 ART 2007

                                                  Circular No. 8819
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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COMET 2007 E2
     Terry Lovejoy, Thornlands, Queensland, Australia, reports his
discovery of a comet with a strong central condensation and a green
extended 4' coma, with a slight extension to the southwest, on
sixteen 90-s CCD images obtained on Mar. 15 with a Canon 350D
camera (+ 200-mm f/2.8 lens); the coma diameter was given as 5'
from his Mar. 16 frame (his positions below have estimated
uncertainties of +/- 15").  At Lovejoy's request, J. Drummond
(Gisborne, New Zealand, 0.41-m reflector) confirmed the comet
visually at mag 9.5 (moderately condensed, coma diameter 2'.6, no
tail).

     2007 UT             R.A. (2000) Decl.       Mag.   Observer
     Mar. 15.727     20 44 05.5    -51 14 14     10     Lovejoy
          15.736     20 44 06.1    -51 13 22              "
          16.525     20 43 02.7    -50 49 35      9.5   Drummond
          16.625     20 42 59.5    -50 45 39              "
          16.704     20 42 55.2    -50 43 14      9.3   Lovejoy


COMETS C/2006 X11 AND C/2006 Y3-Y9 (SOHO)
     Eight additional Kreutz sungrazing comets have been found on
SOHO website images (cf. IAUC 8815).  All were stellar in
appearance except C/2006 X11 (diffuse and small), C/2006 Y8
(slightly diffuse, tiny, mag about 8), and C/2006 Y9 ("mostly
stellar" in appearance).  C/2006 X11, C/2006 Y3 (C3 images), C/2006
Y7, and C/2006 Y9 were very faint (mag about 8.5).  C/2006 Y3 was
of mag about 8 in C2 images.  C/2006 Y4 was of mag about 7.5-8.
C/2006 Y5 reached mag 5.3 on Dec. 21.529 UT (at 10 solar radii) but
showed no apparent tail.  C/2006 Y6 reached mag 5.0 on Dec. 21.846
(at 11 solar radii) in C3 images, while C2 images show a hint of an
extremely faint, thin tail.

 Comet       2006 UT       R.A.(2000)Decl.   Inst.  F    MPEC
 C/2006 X11  Dec. 15.371   17 33.8  -25 05   C2     RM   2007-D16
 C/2006 Y3        17.863   17 47.8  -25 35   C3/2   SY   2007-D16
 C/2006 Y4        20.038   17 55.6  -25 16   C2     RK   2007-D16
 C/2006 Y5        20.929   18 00.8  -27 40   C3/2   TH   2007-D16
 C/2006 Y6        21.238   18 02.3  -27 58   C3/2   BZ   2007-D17
 C/2006 Y7        21.854   18 03.6  -25 20   C2     TH   2007-D17
 C/2006 Y8        21.884   18 03.8  -25 10   C2     RK   2007-D17
 C/2006 Y9        21.914   18 04.1  -25 15   C2     MA   2007-D17

                      (C) Copyright 2007 CBAT
2007 March 16                  (8819)            Daniel W. E. Green