At 22:20 7/06/01 , Allen Thomson wrote:
>Since the XYZ is given every hour and the motion is slow, would simple
>differencing
>of successive coordinates be a reasonable way to get the dots? Also, could
>you comment on whatever coordinate transformation might be needed
>("geocentric solar ecliptic" -> ?) ?
Probably Yes Allen. However the default format , if I remember correctly
doesnt give enough figures to calculate velocity accurately, and it
gives solar ecliptic co-ords, useful for physics of the magnetosphere,
but not for orbits. Both problems can be fixed up, by
1. Deliberately requesting X,Y,Z in equinox 2000 inertial system.
2. requesting units of above be in Kilometers rather than Earth radii.
Tony Beresford
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