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IAUC 8609: C/2005 S4; (3982); C/2005 O2

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IAUC number

                                                  Circular No. 8609
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://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)

     R. H. McNaught, Australian National University, reports his
discovery of a comet on CCD images taken with the 0.5-m Uppsala
Schmidt telescope in the course of the Siding Spring Survey
(discovery observation tabulated below); 120-s exposures taken on
Oct. 1.6 UT clearly show a tail about 8" long in p.a. about 135 deg
(the discovery images on Sept. 30.6 show the comet as slightly

     2005 UT             R.A. (2000) Decl.       Mag.
     Sept.30.55673   22 06 03.85   -37 48 49.1   18.9

The available astrometry (including prediscovery Uppsala Schmidt
images back to July 27), the following parabolic orbital elements,
and an ephemeris appear on MPEC 2005-T12.

     T = 2007 July 18.0603 TT         Peri. =  31.3980
                                      Node  = 318.2820  2000.0
     q = 5.851768 AU                  Incl. = 107.9924

(3982) KASTEL
     P. Pravec and P. Kusnirak, Ondrejov Observatory; L. Kornos and
J. Vilagi, Modra Observatory; D. Pray, Coventry, RI; R. Durkee,
Minneapolis, MN; and W. Cooney, J. Gross and D. Terrell, Sonoita
Research Observatory, AZ, report that photometric observations
obtained during Sept. 24-29 reveal that (3982) has a lightcurve
consisting of two linearly additive components with periods 8.488
and 5.835 (or possibly 2.918) hr and amplitudes 0.27 and 0.08 mag,
respectively.  No attenuations due to occultations/eclipses were
seen, so the proposed interpretation of binary nature of the
minor planet needs to be confirmed with further observations.

     Improved parabolic orbital elements from MPEC 2005-S57:

     T = 2005 Sept. 8.4476 TT         Peri. = 263.8330
     e = 0.859426                     Node  = 280.7698  2000.0
     q = 3.333580 AU                  Incl. = 148.8919
       a = 23.714057 AU    n = 0.0085348    P = 115.5 years

                      (C) Copyright 2005 CBAT
2005 October 1                 (8609)            Daniel W. E. Green

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