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RE: AO-40 Update, 2004-02-03




We currently use magnetorquers and I doubt anyone would say okay to
trying the wheels after such a long absence of control.

Long before we got there, a combination of perturbations, mystery
force, etc. would have imparted all sorts of angular momentum to
the spacecraft and it would probably be in a tumble.  With our
sampling rate for the attitude sensors, cameras, etc. we could with
some help from radio measurements, get some idea about magnitudes of
rotational velocities and infer some things but I think we would have
to be extraordinarily lucky to infer the actual vectors and their
magnitudes and I do not know if we could time the torquers to the
degree necessary to overcome the unknown, but guessed at, rotations.
If it begins to tumble and we cannot get good readings on our
attitude, we would be basically out of luck.

Bob
N4HY



-----Original Message-----
From: owner-AMSAT-BB@AMSAT.Org [mailto:owner-AMSAT-BB@AMSAT.Org]On
Behalf Of keith
Sent: Tuesday, February 03, 2004 4:24 AM
To: amsat
Subject: [amsat-bb] AO-40 Update, 2004-02-03


Stacy,
Lets say all our present hope if futile and the sat drifts for 10 years
and then something breaks loose and
it does an Ao-7 on us.  Without the batteries and with the panels closed
will there be enough power to
drive the wheels to right the bird again?

Keith N6ORS
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