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IAUC 8653: C/2006 A1

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                                                  Circular No. 8653
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://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)


COMET C/2006 A1 (POJMANSKI)
     Grzegorz Pojmanski, Warsaw University Astronomical Observatory,
reports his discovery of a diffuse comet with a coma diameter of 1'
(FWHM) on 3-min CCD frames (pixel size 14".8) taken on 2006 Jan. 1
and 4 with a 180-mm-focal-length f/2.8 telephoto lens (+ V filter)
in the course of the All Sky Automated Survey at Las Campanas;
Pojmanski subsequently identified ASAS images of the comet taken on
2005 Dec. 29.  S. Roland (Montevideo, Uruguay) writes that 20-second
CCD exposures taken with a 0.46-m prime-focus telescope confirm the
cometary nature of the new object, with a coma diameter of about 1'.
More than seven hours after Pojmanski reported his find to the
Central Bureau, K. Cernis reported (apparently independently) that
he has found an object on ultraviolet SWAN/SOHO website images taken
on three nights (back to 2005 Dec. 25) showing a motion consistent
with that of C/2006 A1.

     2005/6 UT           R.A. (2000) Decl.       Mag.   Observer
     Dec. 25         22 09.0       -71 07               SWAN
          29         21 52.6       -69 03                 "
          29.03145   21 50 29      -69 40.6      13.2   ASAS
     Jan.  1         21 42.4       -68 23               SWAN
           1.04388   21 40 28      -68 36.5      12.5   ASAS
           4.03225   21 31 33      -67 31.2      12.0     "
           4.03734   21 31 33      -67 31.1      12.0     "
           4.99875   21 28 51.64   -67 09 39.9   14.6   Roland
           5.00339   21 28 50.91   -67 09 33.7   14.6     "
           5.01031   21 28 49.73   -67 09 23.9   14.7     "
           5.01681   21 28 48.72   -67 09 15.0   14.6     "
           5.02197   21 28 47.83   -67 09 07.9   14.8     "
           5.03106   21 28 46.33   -67 08 55.5   14.5     "
           5.03985   21 28 44.88   -67 08 43.5   14.7     "
           5.04632   21 28 43.71   -67 08 35.7   14.2     "
           5.05587   21 28 42.25   -67 08 21.4   14.7     "
           5.07266   21 28 39.51   -67 07 58.5   14.5     "

Preliminary parabolic orbital elements from the ASAS and Roland data:

     T = 2006 Feb. 22.671 TT          Peri. = 350.499
                                      Node  = 212.275   2000.0
     q = 0.56748 AU                   Incl. =  93.230

                      (C) Copyright 2006 CBAT
2006 January 5                 (8653)            Daniel W. E. Green

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