Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.cosmos.ru/vprokhor/tail/ib1blift.htm
Дата изменения: Thu May 25 18:00:59 2000
Дата индексирования: Tue Oct 2 05:32:31 2012
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Поисковые слова: cassini spacecraft
INTERBALL IB_TAIL ballistic life time

INTERBALL TAIL PROBE (IB_TAIL)
orbital elements evolution and ballistic life-time

Ballistic life-time

Orbit trace geographical coordinates on the last day of flight

Predicted "landing point" coordinates

Orbit in the topocentrical c/s of the "landing point"

  • The orbit inclination to the equatorial plane (black line) and to the ecliptic plane (red line) are shown on the third panel.
  • The value of the right ascension of the ascending node (RAAN) on the Earth's equatorial plane is quasi constant during all flight (see the last panel).
    		• The launch orbital elements value and its evolution during flight is shown on the plot for the time interval (August 3, 1995 - October 16 2000).
  • The non-centricity of the Earth's gravitation potential and gravitation perturbations of the Sun and Moon play the main role in this process.
  • The critical parameter is perigee altitude shown on the first panel. It arises from 800 km up to 5 Earth radii (Re) during 1995- 1997 and decreases to zero during 1998 - 2000. This parameter determine the IB_Tail ballistic lifetime up to October 16, 2000.
  • The rest orbital elements illustrate the development of the events. The beginning of the perigee altitude decreasing coincides with the perigee argument value transferring from the forth quarter to the first one. The question is about the perigee argument measured from the line of nodes on the ecliptic plane, see the red line on the second panel. The blue color fills the first quarter (0 - 30 deg). The perigee argument evolution itself is under influence of the non-centricity of the Earth's gravitation potential.
  • All this scenario is in a good agreement with the theory of Michail Lidov "Evolution of artificial satellites of planets under influence of gravitation perturbations of external forces" [Artificial satellites of the Earth, 1961, #8].

    • Dated 25 May, 2000

    IKI RAN | SSC IKI RAN | INTERBALL mission