Re: Giotto Earth flyby - orbital data

Tony Beresford (starman@camtech.net.au)
Thu, 24 Jun 1999 19:02:06 +0930

At 18:41 24/06/99 , Raoul Behrend wrote:
>Hi Ed,
>
>> ] Giotto's orbital elements with respect to the ecliptic are:
>> ] Semi-major axis - 1.0827 AU. (period 1.127 years)
>> ] Eccentricity - 0.081274.
>> ] Inclination - 5.5353 deg.
>> ] Longitude of ascending node - 279.111 deg.
>> ] Argument of perihelion - 313.2221 deg.
>> ] True anomaly - 339.4604 deg.
>    ^^^^
>
>Mean anomaly will be more useful to to calculations about ephemerides...
>Are these elements J2000 or "mean" equator and ecliptic of the date ?
The conversion from true to mean anomaly is trivial ( in this direction)
via the translation to Eccentric anomaly and then Keplers equation.
Just as much to the point is the epoch of these ecliptic based elements
 Ed, are they for the time of perigee mentioned in the hyperbolic form ? 
Tony Beresford