C/1999 A1 ( Tilbrook )

Japanese version
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Updated on July 11, 1999

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* Profile

Discovery Date January 12, 1999
Magnitude 10.5 mag
Discoverer Justin Tilbrook (Clare, South Australia)

* Pictures

* Orbital Elements

   The following improved orbital elements by Kenji Muraoka, are 
  from 64 observations  1999 Jan. 13  to  Feb. 25, perturbations 
  by 9 Planets, Moon and 5 minor planets were taken into account.
   The mean residual is +/- 0.67 arc seconds.

      Epoch  =  1999 Jan  = 2451200.5
          T  =  1999 Jan. 29.65791       +/- 0.00058 (m.e.) TT
       Peri. =  232.67071                +/- 0.00076
       Node  =  259.12246                +/- 0.00062   (2000.0)
       Incl. =   89.48108                +/- 0.00091
          q  =    0.7307403              +/- 0.0000029 AU
          e  =    0.9958512              +/- 0.0000423
        1/a  =   +0.0056775              +/- 0.0000579 1/AU
        ( P  =   2338 years )

* Finding Charts

* Magnitudes Graph

        m1 = 12.3 + 5 log d + 10.0 log r  [ ,0]  (             - 1999 Jan. 29)
        m1 = 11.2 + 5 log d + 10.0 log r  [0, ]  (1999 Jan. 29 -             )

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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.