RE: Mir passes in next 24 hours

From: Chris Peat (
Date: Thu Mar 22 2001 - 03:21:46 PST

  • Next message: Rainer Kracht: "GEO331 (95-586A, 99331)"

    Hi all,
    > >I tried using Heavens-Above to show the Mir pass for Sydney that Rob
    > >Matson mentioned, without any luck.  My own predictions match Rob's,
    > >so I wonder why Heavens-Above isn't showing it?   The sun would be about
    > >14 degrees below the local horizon for that pass, so it wouldn't be
    > >filtered out because the sky was too bright.
    > It certainly was giving it yesterday Craig. Something about the elset
    > must filter it out.
    > tony beresford
    It seems I must eat humble pie! I have tracked down the missing pass, and
    discovered that it was caused by too large a time step in the Heavens-Above
    prediction software. I deliberately set this as high as possible to reduce
    the processing load on the servers, but this particular pass of Mir over
    Sydney just managed to start and finish during a time step and was missed.
    For most satellites the step size was OK, but because Mir is now so low it
    crosses the sky very quickly. I have fixed the problem so this shouldn't
    happen again. You can see the pass now on Heavens-Above as proof.
    My apologies to those people who might have missed their last chance to see
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