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IAUC 8547: COMET C/2005 M1 (CHRISTENSEN); C/2005 G7, C/2005 H2,, C/2005 H3

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IAUC number

                                                  Circular No. 8547
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)

     E. J. Christensen, Lunar and Planetary Laboratory, reports his
discovery of a comet on images taken with the 1.5-m f/2 reflector
in the course of the Mount Lemmon Survey (discovery observation
given below).  On four co-added 90-s CCD images from June 17.4 UT,
Christensen noted a 5" coma and a 10" tail in p.a. 230-240 deg;
images taken in improved seeing on June 18.4 showed a 15" tail in
p.a. 230 deg and a compact coma of diameter approximately 7" (four
co-added 60-s exposures).  Following posting on the 'NEO
Confirmation Page', A. C. Gilmore found a moderately condensed,
circular coma of diameter about 15" (but no tail) on four co-added
120-s CCD frames taken on June 19.7 with the 1.0-m f/7.7 reflector
at Mount John University Observatory.

     2005 UT             R.A. (2000) Decl.       Mag.
     June 17.41206   22 41 08.59   - 7 52 07.8   19.9

The available astrometry, the following very preliminary parabolic
orbital elements, and an ephemeris appear on MPEC 2005-M33.

     T = 2005 Jan. 24.728 TT          Peri. = 140.756
                                      Node  = 143.962   2000.0
     q = 2.94607 AU                   Incl. =   8.741

COMETS C/2005 G7, C/2005 H2, AND C/2005 H3 (SOHO)
     Following are the initial positions for additional comets
found on SOHO website images (continuation to IAUC 8546); C/2005 H2
belongs to the Meyer group, the others being Kreutz sungrazers.  K.
Battams writes that C/2005 G7 had a diffuse 'teardrop' shape,
reaching mag about 7.5 at 7.1 solar radii (Apr. 14.085 UT).  C/2005
H2 was elongated and faint, but Battams notes that this may or may
not have been a tail, adding that it is not uncommon to see stars
appear "diagonally elongated" in the SOHO images; it peaked in
brightness at mag about 7.8 at 7.0 solar radii (Apr. 17.726).
C/2005 H3 was partly obscured by the pylon in the C3 coronagraph,
but in C2 images it reached mag about 5.2 at 6.6 solar radii on
Apr. 22.368, when its tail length was 93".

 Comet       2005 UT       R.A.(2000)Decl.  Inst.  F    MPEC
 C/2005 G7   Apr. 14.171   1 38.4   + 8 36   C2    HS   2005-K43
 C/2005 H2        17.629   1 48.2   +12 06   C2    HS   2005-K43
 C/2005 H3        21.779   2 14.4   +10 16   C3/2  HS   2005-K43

                      (C) Copyright 2005 CBAT
2005 June 20                   (8547)            Daniel W. E. Green

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