Farrell,
An often used rule-of-thumb in astrodynamics for "decay" height is about 140
kilometers
which is about 87 miles. A satellite that gets that far into the atmosophere
will burn up during
it's final orbit in short order! I would recommend you just keep trying until
you are sure
the satellite is no longer in orbit. I will post an updated decay prediction
on AMSAT-BB this
afternoon for operator planning purposes.
Jim, N8OQ
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