for every radius there is an escape velocity, but for every radius there is also a set orbit velocity. bigger radius means smaller escape velocity but also smaller orbit velocity, and vice versa. interesting question... will do some math...
>>7799455 But.. It isn't easy by any means. And the differences in "difficulty" will be in the same order of magnitude, which is well beyond reasonable-enough-to-ever-be-realistically-considered limit. Basically, deorbiting planets is not possible regardless of orbital parameters.
>>7797902 A change in velocity (prograde/retrograde) affects the opposite side of the orbit the most. Therefore the most efficient way of deorbiting something is when it is at it's apoapsis, since the periapsis would be (by definition) at the opposite side of the apoapsis, and also closest to the parent body. The orbiting object is also moving slowest at its apoapsis, hence it is more efficient to deorbit an object when it is at it's slowest.
OP, look into bi-elliptic transfers for a better explanation.
>>7797902 The Oberth Effect tells you that a rocket in motion always puts out more kinetic energy than the chemical energy of the fuel. Why? Because the kinetic energy of the fuel that moves with the rocket has to go somewhere when the fuel gets ejected and is no longer part of the rocket and so it ends up in the kinetic energy of the rocket, where else. Faster means more effective. This is not a matter of direction or type of orbital maneuver. Orisit? When you decelerate the effect get weaker and you fly in your own exaust plume.. I vote for periapsis, thrust till touch-down.
Deorbiting near asteroids/comets to tickle the sun would be nice. Live show on the Plasma Channel.
>>7800031 >>7800697 Well yes, obviously actually deorbiting a planet isn't something that's reasonable to do, but the same thing should apply to any satellite. The original discussion was prompted by the theoretical ninth planet, is all.
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