Arturo O. answered • 05/07/18

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I assume you are asking if we can tell if it is in a stable circular orbit.

T = period of orbit

r = radius of orbit

R

_{E}= radius of earthh = height of orbit above surface of the earth

M = mass of earth

r = R

_{E}+ hFor a given height,

(E1) v = 2πr/T = 2π(R

_{E}+ h)/TIn a stable circular orbit,

(E2) v = √(GM/r) = √[GM/(R

_{E}+ h)]Compute v from equations E1 and E2 and compare values. If E1 gives a higher v than E2, the object is moving too fast to be in a circular orbit, and will rise in altitude. If E1 gives a lower v than E2, the object is moving too slow, and will lose altitude.