Re: Fobos-Grunt: analysis of orbit evolution

From: Chris Jones (
Date: Thu Nov 17 2011 - 15:14:41 UTC

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    On Thu, 17 Nov 2011 02:17:12 -0800 (PST) William Thompson <> wrote:
    > Is the Phobos probe itself alive and well?
    > Maybe it doesn't "know" it's still attached to
    > the escape stage, and is trying to hold its
    > attitude and maneuver.
    Their is no escape stage as such.  This probe has an integrated rocket unit
    (based on the Fregat-SB upper stage) which is supposed to perform the escape
    firings (there are two, with a toroidal propellant tank dropped after the
    first), Mars orbit insertion, and Phobos landing.  In other words, if the
    probe had separated from this unit, it would be a catastrophic failure.
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