K
killium
Guest
We all know about the gravity assist flyby or simple observation flyby. It is relativly easy to send a probe on a trajectory that will bring it close to some object and do the manoeuver. How about multiple flyby ?<br /><br />For example, a mission recently did a multiple gravity assist to reach its target. It did it with Venus, then the Earth, then again Venus (or the other way around ? anyway...) and then Jupiter. What are the odd that all those planets are correctly positionned for this ?<br /><br />I would have thought that the correct alignment of MANY objects would be very rare but a lot of mission are desing that way.<br /><br />Is it more frequent than i think or there is trajectory manoeuver done during the flight to have to correct alignment on the next pass, or there is something i am missing ?<br /><br />For example, Cassini will do something like 40 moons flyby over 70 orbit.... isn't that high ? <div class="Discussion_UserSignature"> </div>