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IAUC 8873: P/2007 S1; Sats OF SATURN

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IAUC number

                                                  Circular No. 8873
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 S1 (ZHAO)
     Haibin Zhao, Purple Mountain Observatory, reports the
discovery of a comet (discovery observation tabulated below) on CCD
images obtained with the 1.04-m f/1.8 Schmidt telescope at XuYi
Station; the object shows a moderately condensed coma with diameter
15".6.  Following posting on the 'NEOCP' webpage, G. Sostero
(Remanzacco, Italy) reports that unfiltered CCD images obtained by
L. Donato and V. Gonano on Sept. 19.9 UT show (0.45-m reflector;
forty co-added 60-s exposures) a coma nearly 25" in diameter with a
fan-shaped tail nearly 40" long in p.a. 240 deg.  L. Buzzi and F.
Luppi (Varese, Italy, 0.60-m reflector) write that their forty-five
stacked 15-s images from Sept. 20.0 show a 10" central condensation
elongated in p.a. about 270 deg surrounded by a faint 30" coma.  E.
Guido, Castellammare di Stabia, Italy, writes that 12 stacked 60-s
unfiltered exposures taken remotely by Sostero and himself on Sept.
20.4 with a 0.25-m f/3.4 reflector at Mayhill, NM, U.S.A., show a
diffuse coma nearly 15" in diameter with total mag 17.8 and a sharp
central condensation with a tail nearly 25" long toward p.a. 260
deg.  Ten 180-s images taken by R. Ligustri (Talmassons, Udine,
Italy, 0.35-m reflector) on Sept. 20.9 show a coma of diameter
about 20"-30".

     2007 UT             R.A. (2000) Decl.       Mag.
     Sept.17.78693    0 47 37.51   - 2 00 44.2   18.2

The available astrometry (including prediscovery LONEOS
observations from Sept. 8 and 15 identified by T. Spahr), the
following elliptical orbital elements, and an ephemeris appear on
MPEC 2007-S36.

     T = 2007 Dec. 10.559 TT          Peri. = 246.072
     e = 0.34443                      Node  = 141.930   2000.0
     q = 2.50287 AU                   Incl. =   6.024
       a =  3.81784 AU     n = 0.132123     P =   7.46 years

     The IAU Working Group for Planetary System Nomenclature has
approved new designations and names of satellites of Saturn (cf.
IAUC 8826):

    Saturn XLIX     Anthe       = S/2007 S 4      IAUC 8857
    Saturn L        Jarnsaxa    = S/2006 S 6      IAUC 8727
    Saturn LI       Greip       = S/2006 S 4      IAUC 8727
    Saturn LII      Tarqeq      = S/2007 S 1      IAUC 8836

                      (C) Copyright 2007 CBAT
2007 September 20              (8873)            Daniel W. E. Green

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