المحافظة على مدار: الفرق بين النسختين

==مدار أرضي جغرافي متزامن==

 

 

For spacecraft in a [[halo orbit]] around a [[Lagrangian point]] stationkeeping is even more fundamental as such an orbit is unstable; without an active control with thruster burns the smallest deviation in position/velocity would result in the spacecraft leaving the orbit completely.<ref name=esa20090614/>