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IAUC 8876: C/2007 S2; V455 And

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                                                  Circular No. 8876
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 C/2007 S2 (LEMMON)
     An apparently asteroidal object discovered on CCD images taken
with the 1.5-m reflector in the course of the Mt. Lemmon survey
(discovery observation tabulated below), and posted on the Minor
Planet Center's 'NEOCP' webpage, has been found to show cometary
appearance by two observers:  Q.-z. Ye (Department of Atmosphere
Science, Sun Yat-sen University, Guangzhou, China) writes that
three stacked 60-s CCD exposures taken with the Lulin Observatory
0.41-m Ritchey-Chretien reflector on Sept. 27.85 UT show a very
obvious coma of diameter about 5".5 with a short fan-like tail 6"
long towards p.a. about 180-270 deg.  J. W. Young reports that his
images taken with the Table Mountain 0.61-m f/16 Cassegrain
reflector on Oct. 3.45-3.53 show a 6"-diameter, very round, bright
coma with no hint of a tail.

     2007 UT             R.A. (2000) Decl.       Mag.
     Sept.25.49148    8 21 53.89   +19 54 08.5   18.9

The available astrometry, the following preliminary parabolic
orbital elements, and an ephemeris appear on MPEC 2007-T11.  This
comet's orbit is probably of intermediate or short period.

     T = 2007 Oct. 12.007 TT          Peri. = 179.725
                                      Node  = 296.835   2000.0
     q = 6.21749 AU                   Incl. =  15.669


V455 ANDROMEDAE
     E. Broens, Mol, Belgium, reports following visual magnitude
estimates of V455 And (cf. IAUC 8868) on behalf of the Werkgroep
Veranderlijke Sterren, Vereniging Voor Sterrenkunde:  Sept. 11.811
UT, 10.7 (D. Vansteelant, Varsenare, Belgium); 12.860, 10.6 (H.
Hautecler, Boutersem, Belgium); 13.868, 10.6 (A. Baillien, Tongeren,
Belgium), 14.863, 10.8 (Vansteelant); 15.808, 11.2 (A. Diepvens,
Balen, Belgium); 15.894, 10.8 (Hautecler); 16.806, 11.0 (Baillien);
18.860, 11.3 (P. Cloesen, Beringen, Belgium); 21.891, 11.4
(Vansteelant); 22.791, 12.0 (Diepvens); 23.857, 12.9 (Cloesen);
24.816, 13.2 (E. Muyllaert, Oostende, Belgium); 25.802, 13.1
(Vansteelant).  CCD V magnitudes by M. Martignoni, Magnago, Italy:
Sept. 11.972, 10.22; 12.933, 10.30; 15.035, 10.58; 15.977, 11.01;
19.052, 11.32; 20.023, 11.48; 23.990, 12.66.

                      (C) Copyright 2007 CBAT
2007 October 3                 (8876)            Daniel W. E. Green

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