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IAUC 8968: C/2008 Q3; V1647 Ori; 6P

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IAUC number

                                                  Circular No. 8968
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://www.cfa.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)

     G. J. Garradd reports his discovery of a comet on CCD images
obtained with the 0.5-m Uppsala Schmidt telescope, the object
showing a 10" coma (more prominent toward the north); despite poor
seeing, the comet looks more diffuse than nearby stars.  Following
posting on the Minor Planet Center's 'NEOCP', A. C. Gilmore and P.
M. Kilmartin write that two stacked 120-s frames taken with the Mt.
John 1.0-m reflector on Aug. 28.5 UT show a centrally condensed
coma of diameter 6" with no tail.

     2008 UT             R.A. (2000) Decl.       Mag.
     Aug. 27.63903    0 29 46.14   -48 22 19.7   19.2

The available astrometry, the following preliminary parabolic
orbital elements, and an ephemeris appear on MPEC 2008-Q52.

     T = 2009 July  1.896 TT          Peri. = 320.598
                                      Node  = 218.057   2000.0
     q = 2.52970 AU                   Incl. = 139.820

     K. Itagaki, Yamagata, Japan, reports (via S. Nakano, Sumoto;
and via H. Yamaoka, Kyushu University) the apparent brightening of
V1647 Ori and its associated nebula (cf. IAUCs 8284, 8354, 8396,
8600, 8681, 8694) to mag about 16.7 on an unfiltered CCD image
taken on Aug. 26.789 UT with a 0.60-m f/5.7 reflector, noting that
neither the variable star nor the associated nebula were visible on
his survey frame taken with a 0.21-m reflector on Jan. 2.598
(limiting mag 17.5).  Itagaki adds that the star appears in the
USNO-B1.0 catalogue (epoch 1971.3) at blue mag 19.7 and red mag
19.5, and he provides the following precise position for V1647 Ori
from his recent image:  R.A. = 5h46m13s.16, Decl. = -0o06'03".6
(equinox 2000.0).  Yamaoka notes that a similar quiescent
brightness was noted in 2005 Oct. by Acosta-Pulido et al. (2007,
A.J. 133, 2020) following its earlier outburst (to mag about 15-16)
in 2004 Jan., while an earlier outburst in 1966-1967 was found in
the Asiago plate collection by Aspin et al. (2006, A.J. 132, 1298).

     Total-magnitude estimates by J. J. Gonzalez, Leon, Spain:
Aug. 5.00 UT, 9.6 (25x100 binoc.); 9.03, 8.9; 23.91, 8.1; 28.00,
8.0 (10x50 binoc.).

                      (C) Copyright 2008 CBAT
2008 August 28                 (8968)            Daniel W. E. Green

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