GRANAT Ballistic Home Page
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Granat pointing mode of last years ( 1996, 1997, 1998 )
Long-term and short-term Granat orbit prediction
This picture illustrates the possibilities of long-term prediction for the planning of observation
The accuracy of prediction depends of semimajor axis variation.
The orbit with decreasing eccentricity will be predicted more exactly on
long time scale. Starting from 1992 the long-term prediction is
better than 500 km (in radius-vector). This accuracy is quite acceptable for long-term planning.
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GRANAT orbit evolution in 1990 - 1996 years
ALL PICTURES
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Orbit evolution for full time of existence (1990-1999)
Variation of Alpha_Sun angle of the Sun sensor
Guide Stars used for X-axis pointing
Guide Stars used for X-axis pointing ( for every year )
Pointing on the sky for every year
Observation of Galactic center area
The accuracy of prediction depends of semimajor axis variation.
The orbit with decreasing eccentricity will be predicted more exactly on
long time scale. Starting from 1992 the long-term prediction is
better than 500 km (in radius-vector). This accuracy is quite acceptable for long-term planning.
