Re: Iridium spares

From: Sebastian Stabroth (
Date: Tue Feb 12 2002 - 17:58:05 EST

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    > ... If an outage occurs, there's a
    > delay until the two planes coincide, but a spare can then be boosted
    > from the intermediate orbit into the operational plane in which the
    > failure occurred.
    since all Iridiums have about the same inclination and orbit type,
    there is no relative drift between the orbital planes and because of the
    very near polar orbit no variation of RA of ascend. node at all. This is
    very good news for a satellite constallation ;-), everything is somehow
    static in space. So I think the new satellites are spare units for one
    orbital plane only. But perhaps they go their own ways with some RA change
    maneuvers, if needed.
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