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Re: DirecTV satellite may explode in orbit

Posted by The silence on Mon Jan 27 16:40:57 2020, in response to Re: DirecTV satellite may explode in orbit, posted by Orange Blossom Special on Mon Jan 27 13:02:40 2020.

That’s the thing, it will never reenter. Geo-stationary and Geo-synchronous satellites are pushed about 300km higher into super-synchronous (orbit takes longer than one solar day) graveyard orbit. They don’t have enough fuel for a full retrograde thruster burn to bring the low point in the orbit to a point where the atmospheric drag will pull it down.

De-orbit requires 1500 meters per second change in speed (this change is speed is know as “Delta-V”). The graveyard orbit only requires 11 meters per second, spent in two bursts (one to push the top of the orbit higher, the other to “circularize” the orbit when it gets there.

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