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IAUC 8861: C/2007 P1; Poss. N IN Vul

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                                                  Circular No. 8861
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)

     R. H. McNaught reports his discovery of a comet on 20-s CCD
frames obtained with the 0.5-m Uppsala Schmidt telescope at Siding
Spring Observatory (discovery observation tabulated below), the
comet showing a coma diameter of about 40", extended to the
southwest; McNaught adds that this is the most diffuse comet that
he can remember observing, with little or no condensation and thus
difficult to measure.  Follow-up 60-s exposures by G. J. Garradd
with the same telescope on Aug. 8.7 UT show some condensation, but
the images are still very difficult to measure.  Following posting
on the Minor Planet Center's 'NEOCP' webpage, J. Broughton (Reedy
Creek, Qld., Australia, 0.51-m f/2.7 reflector) writes that his CCD
frames taken on Aug. 9.7 show a 30"-diameter coma and a 2' tail in
p.a. 350o.

     2007 UT             R.A. (2000) Decl.       Mag.
     Aug.  7.72005    1 59 58.59   -31 40 36.8   18.7

The available astrometry, the following preliminary parabolic
orbital elements, and an ephemeris appear on MPEC 2007-P23.

     T = 2007 Mar. 26.439 TT          Peri. =  97.689
                                      Node  = 190.879   2000.0
     q = 0.63318 AU                   Incl. = 122.963

     S. Nakano, Sumoto, Japan, reports the discovery of a possible
nova (mag 9.5) by Hiroshi Abe (Yatsuka-cho, Matsue, Shimane-ken,
Japan) on several 30-s survey frames (limiting mag about 11.5)
taken around Aug. 8.54 UT using a Canon EOS Kiss Digital Camera (+
35-mm f/2.8 Pentax lens), the new object measured by Nakano from
Abe's JPEG image to be at R.A. = 19h54m24s.3, Decl. = +20o52'47"
(equinox 2000.0; estimated uncertainty +/- 8"); Abe notes that
nothing was visible at this location on frames taken on July 23, 31,
and Aug. 4.  Nakano forwards the following position end figures for
the new object from K. Kadota (Ageo, Saitama-ken, Japan, 0.25-m
reflector + unfiltered CCD, Aug. 8.682, mag 9.4):  24s.64, 51".9;
Kadota adds that a star of red mag 18.1 and blue mag 17.6 in the
USNO-A2.0 catalogue has position end figures 24s.66, 51".7.  Visual
magnitude estimates forwarded by E. Waagen, AAVSO:  Aug. 9.006, 9.3
(S. Swierczynski, Dobczyce, Poland); 9.093, 8.7 (M. Komorous,
London, ON, Canada); 9.188, 8.4 (R. King, Duluth, MN); 9.208, 8.7
(J. Bortle, Stormville, NY).

                      (C) Copyright 2007 CBAT
2007 August 9                  (8861)            Daniel W. E. Green

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