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IAUC 8894: P/2007 V2; 2007 VA_85; P/2007 T6

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IAUC number

                                                  Circular No. 8894
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)

COMET P/2007 V2 (HILL)
     R. E. Hill reports his discovery of a comet (discovery
observation tabulated below) of mag about 19 with a diffuse 4" x 6"
coma and a broad tail about 2' long in p.a. 260 deg in four co-
added 30-s CCD exposures taken in 2"-3" seeing with the Mt. Lemmon
1.5-m reflector.  His four co-added 60-s unfiltered images taken
the following night (Nov. 10.3 UT) show a well-condensed cirular
coma and a broad tail 2'.6 long.  Following posting on the Minor
Planet Center's NEOCP webpage, J. Young reports that CCD images
taken by W. Young and himself in very poor seeing on Nov. 10.24-
10.28 with the Table Mountain 0.61-m f/16 Cassegrain reflector show
a round 6" diffuse coma with with no central condensation and no
visible tail seen.  R. Ligustri and D. Da Rio (Talmassons, Udine,
Italy, 0.35-m reflector) write that their twenty co-added 180-s
exposures from Nov. 9.83-9.85 show a very faint coma of diameter
about 20".

     2007 UT             R.A. (2000) Decl.
     Nov.  9.29539    2 38 15.99   +12 05 51.8

The available astrometry (with prediscovery Spacewatch observations
from Oct. 14) and the following orbital elements appear on MPEC

     T = 2007 July 31.744 TT          Peri. = 277.971
     e = 0.32388                      Node  = 100.245   2000.0
     q = 2.74859 AU                   Incl. =   2.449
       a =  4.06522 AU     n = 0.120248     P =   8.20 years

2007 VA_85
     An apparently asteroidal object of mag 18.5-19 discovered by
the LINEAR survey on Nov. 4.1 UT has the shortest known period (P =
7.6 yr) for a sun-orbiting natural object with a retrograde orbit
(i = 132.6 deg).  Attempts to find cometary activity have been
unsuccessful.  The available astrometry and orbital elements appear
on MPEC 2007-V73.

     Additional observations have show this comet (cf. IAUC 8881)
to be of short period, as indicated by the orbital elements on MPEC
2007-V56 (T = 2007 Aug. 19.586 TT, e = 0.50400, q = 2.23213 AU,
Peri. = 335.833 deg, Node = 102.636 deg, i = 22.148 deg, equinox
2000.0, P = 9.55 yr).

                      (C) Copyright 2007 CBAT
2007 November 10               (8894)            Daniel W. E. Green

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