C/1998 P1 ( Williams )

Japanese version
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Updated on September 15, 1999

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* Profile

Discovery Date August 10, 1998
Magnitude 9.5 mag
Discoverer Peter Williams (Heathcote, Australia)

* Pictures

* Orbital Elements

   The following improved orbital elements by Kenji Muraoka, are
  from 398 observations  1998 Aug. 11  to  1999 May 15, including 
  9 Planet and 5 minor planets perturbations and non-gravitational
  effect of style II ( A1 , A2 , A3 ).
   The mean residual is  +/- 0.76 arc seconds.

      Epoch  =  1998 Nov.  3.0  TT       JDT = 2451120.5
          T  =  1998 Oct. 17.84580       +/- 0.00027 (m.e.) TT
       Peri. =  294.46742                +/- 0.00040
       Node  =  156.37090                +/- 0.00018   (2000.0)
       Incl. =  145.72753                +/- 0.00006
          q  =    1.1462029              +/- 0.0000068 AU
          e  =    0.9987446              +/- 0.0000104
        1/a  =   +0.0010953              +/- 0.0000091 1/AU
         A1  =  +31.441                  +/- 0.283
         A2  =   +2.14839                +/- 0.10776
         A3  =   -1.03488                +/- 0.03907
        ( P  =  27588 years )

* Finding Charts

* Magnitudes Graph

        m1 = 6.0 + 5 log d + 10.0 log r  [   ,  0]  (             - 1998 Oct. 17)
        m1 = 7.6 + 5 log d +  6.6 log r  [  0,150]  (1998 Oct. 17 - 1999 Mar. 16)
        m1 = 8.7 + 5 log d + 10   log r  [150,   ]  (1999 Mar. 16 -             )

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The orbital elements are calculated by Kenji Muraoka.
The charts are made with StellaNavigator Ver.2.0 for Windows (AstroArts / ASCII).
The magnitudes graphs are made with Comet for Windows.

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Copyright(C) Seiichi Yoshida (comet@aerith.net). All rights reserved.