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IAUC 8868: P/2007 R2; V455 And = HS 2331+3905

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                                                  Circular No. 8868
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://www.cfa.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)


COMET P/2007 R2 (GIBBS)
     A. R. Gibbs reports his discovery of a comet on four co-added
30-s unfiltered CCD images obtained with the 0.68-m Schmidt
telescope in the course of the Catalina Sky Survey ("discovery"
observation tabulated below), the comet showing a compact 7" coma
and a short, narrow tail 10" long in p.a. 250 deg.  Following
posting on the Minor Planet Center's 'NEOCP' webpage, other CCD
astrometric observers have also commented on the object's cometary
appearance.  J. W. Young (Table Mountain 0.61-m f/16 reflector)
notes that his images from Sept. 11.36-11.39 UT show a slightly
elongated 8"-diameter coma with a fairly bright condensation, and a
very straight tail is 40" long in p.a. 255 deg is seen in several
long exposures; images from Sept. 12.5 show a 8" coma slightly
elongated toward the 30"-long tail (p.a. 255-260 deg).  J. E.
McGaha (Tucson, AZ, 0.62-m f/5.1 reflector) reports that fived
stacked 60-s images from Sept. 11.44-11.45 show a 30" coma
elongated in p.a. 245 deg with a very narrow tail extending 90" at
this same position angle.  P. Birtwhistle (Great Shefford,
Berkshire, England, 0.40-m f/6 reflector) writes that his stacked
images from Sept. 12.1 show a diffuse coma of diameter 4" with a
10" tail in p.a. 260 deg.

     2007 UT             R.A. (2000) Decl.       Mag.
     Sept.10.41401    3 06 39.70   +17 40 47.3   18.2

The available astrometry, the following preliminary elliptical
orbital elements, and an ephemeris appear on MPEC 2007-R55.

     T = 2007 Aug. 26.359 TT          Peri. = 352.796
     e = 0.55779                      Node  =   8.509   2000.0
     q = 1.45571 AU                   Incl. =   1.410
       a =  3.29193 AU     n = 0.165017     P =   6.0 years


V455 ANDROMEDAE = HS 2331+3905
     N. N. Samus, Institute of Astronomy, Moscow, informs us that
this cataclysmic variable, which has undergone its first known
major outburst this past week (cf. CBET 1053), has been assigned
the permanent variable-star designation V455 And.  E. Broens, Mol,
Belgium, reports additional visual magnitude estimates on behalf of
the Werkgroep Veranderlijke Sterren, Vereniging Voor Sterrenkunde:
Sept. 6.837 UT, 8.7 (A. Diepvens, Balen, Belgium); 7.883, 9.2
(Broens); 9.872, 9.9 (H. Hautecler, Boutsersem, Belgium); 10.809,
10.3 (D. Vansteelant, Varsenare, Belgium).

                      (C) Copyright 2007 CBAT
2007 September 12              (8868)            Daniel W. E. Green

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