Central Bureau for Astronomical Telegrams

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IAUC 8665: C/2006 B1; 1985U

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                                                  Circular No. 8665
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)

     R. H. McNaught reports the discovery of a slightly diffuse
comet (discovery observation tabulated below) on Siding Spring
Survey images taken with the 0.5-m Uppsala Schmidt telescope.  Some
images from Jan. 27.6 UT suggest that the coma, which has a
diameter of about 8", extends to the west; McNaught adds that 60-s
Uppsala Schmidt exposures taken by G. Garradd (possibly affected by
light cirrus clouds) on Jan. 28.7 also show the object to be rather
more diffuse than stars of similar brightness, with a faint coma of
diameter about 15" possibly extended towards the west.  Three co-
added 200-s CCD exposures in poor seeing by A. C. Gilmore (Mt. John
0.6-m f/7.6 reflector) on Jan. 30.45 and 30.46 show an uncondensed
circular coma about 13" diameter, with no hint of tail.

     2006 UT             R.A. (2000) Decl.       Mag.
     Jan. 27.62223   13 08 10.75   -39 23 36.2   18.3

The available astrometry, the following preliminary parabolic
orbital elements, and an ephemeris appear on MPEC 2006-B86.

     T = 2005 Nov.  3.589 TT          Peri. = 298.193
                                      Node  = 161.411   2000.0
     q = 2.96619 AU                   Incl. = 134.175

     S. V. Antipin, Sternberg Astronomical Institute and Institute
of Astronomy (Russian Academy of Sciences), reports the discovery
of an apparent supernova on archival plates in the Moscow
collection that were taken with the Crimean 40-cm astrograph.  The
coordinates of the apparent supernova, measured relative to USNO-
A2.0 stars, are R.A. = 2h25m41s.95, Decl. = +39o35'12".3 (equinox
2000.0), which is 1" north of the galaxy's position in the USNO-
A2.0 catalogue.  The star is seen on five plates, at the following
photographic magnitudes:  1985 Jan. 13.75 UT, [16.2; Sept. 16.03,
15.2; 17.02, 15.0; 21.99, 15.2; 22.02, 15.3; 25.03, 15.9:; 1986
Sept. 3.98, [17.0.  SN 1985U is not present on Digitized Sky Survey
images or on any other plates of the Moscow collection.  The parent
galaxy is difficult to see on the best Moscow plates as a nebular
object at m_pg about 17.0.

                      (C) Copyright 2006 CBAT
2006 January 30                (8665)            Daniel W. E. Green

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