Re: Iridium 27 + Orion 3

From: Bjoern Gimle (
Date: Sat May 13 2000 - 13:29:14 PDT

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    Interesting observation! One or two more observations of same or better
    brightness, in other directions, may fix the rotation axis. I found one by
    Jim Nix from Sep.02, but precession may have changed the axis considerably
    since then.
    The period may be 6.67 sec, but then the second series is only 0.7 sec
    before the first. 2.22 sec would be expected from different MMAs if the
    rotation axis was along the long axis - but I guess the greatest moment of
    inertia is at right angles from this.
    It is possible to fit the two series to a reflection from one surface, with
    a period of 6.63 seconds, and it is geometrically possible since the flashes
    trace en "ellipse" on the hemisphere, and the "straight" track can intersect
    this twice.
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    Don Gardner wrote:
    > There was an interesting pattern of bright flashes from Iridium 27.  There
    > were 2 segments of distinctive bright (-1 mag or brighter)flashing.  ...
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