Re: Giotto Earth flyby - orbital data

Ed Cannon (
Thu, 24 Jun 1999 05:06:30 -0500

Raoul wrote:

>Mean anomaly will be more useful to to calculations about ephemerides...
>Are these elements J2000 or "mean" equator and ecliptic of the date ?

and Tony replied:

> 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 ? 

I'm afraid I don't know the answer but have sent a follow-up 
inquiry (and included your e-mail addresses just in case the 
source might be interested in replying directly).

By the way, I also sent that information to the NASA Horizons 
site that generates ephemerides:

(Thanks for the reminder, Randy!  I had forgotten about that -- 
or at least a similar site -- that was publicized back when NEAR 
did its flyby.)

Now, I'll send this and another msg and then must get a bit of

Ed Cannon - - Austin, Texas, USA