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<blockquote data-quote="Analoguesat" data-source="post: 1090130" data-attributes="member: 176362">Most of the tv birds are probably unsuitable for rescue once they have reached graveyard altitude. As part of the passivating process any pressurised systems including coolants &amp; fuels are depleted and the batteries are supposed to be shorted out as part of the electrical deactivation. All this to avoid accidental on orbit explosions but it does rather spoil the chances of them being reactivated.I dare say there are a few up there that didnt passivate correctly and may be candidates, but something thats been in orbit 25 or 30 years probably isnt going to be in great shape anyway&nbsp;&nbsp; - and low powered tooECS 4 &amp; 5 are known to be still electrically powered - they are occasionally reported to have some telemetry signals transmittingTo be honest the best thing that could be done for the really ancient old tv birds still up there is to attach a space tug to them to give them a tow down low enough the orbit will degrade &amp; they will burn up in a reasonable length of time. Get them out the way!</blockquote>

[QUOTE="Analoguesat, post: 1090130, member: 176362"] Most of the tv birds are probably unsuitable for rescue once they have reached graveyard altitude. As part of the passivating process any pressurised systems including coolants & fuels are depleted and the batteries are supposed to be shorted out as part of the electrical deactivation. All this to avoid accidental on orbit explosions but it does rather spoil the chances of them being reactivated. I dare say there are a few up there that didnt passivate correctly and may be candidates, but something thats been in orbit 25 or 30 years probably isnt going to be in great shape anyway - and low powered too ECS 4 & 5 are known to be still electrically powered - they are occasionally reported to have some telemetry signals transmitting To be honest the best thing that could be done for the really ancient old tv birds still up there is to attach a space tug to them to give them a tow down low enough the orbit will degrade & they will burn up in a reasonable length of time. Get them out the way! [/QUOTE]

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