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Microcap & Penny Stocks : Globalstar Telecommunications Limited GSAT
GSAT 62.88-0.5%Nov 14 9:30 AM EST

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To: Jeff Vayda who wrote (3928)4/16/1999 4:30:00 PM
From: DoctorEvil  Read Replies (2) of 29987
 
If I may interject for a moment . . .

While propellant use is key in determining the useful life of the satellites, solar array performance is equally, if not more, important.

At the beginning of life [BOL], the solar arrays can generate far more power than at end of life [EOL]. This is due to the fact that over time in orbit, the satellite is constantly bombarded by tiny bits of space dust. These micrometeorites slowly pit the solar cells, reducing their overall efficiency.

Eventually, the efficiency will be reduced enough that the satellite will be unable to collect enough solar power to balance the power consumed by the payload (or at least sustain full-power operations). It is this effect, coupled with propellant usage, that determines when the satellite is retired.

Taking both solar array degradation and propellant usage into account, a 7.5 - 10 year satellite lifespan is a pretty good estimate.

- Dr. Evil
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