Re: Ariane 5 Debris ( SYLDA Dispenser ) decay info

From: Björn Gimle (bjorn.gimle@gmail.com)
Date: Fri Apr 05 2013 - 18:45:55 UTC

  • Next message: Björn Gimle: "Re: Ariane 5 Debris ( SYLDA Dispenser ) decay info"

    First, predictions posted are usually more accurate, around 15% of
    remaining lifetime. This would be around +-8 hrs
    Second, although the predicted decay may be close to you, a revised
    decay time would probably end near the same part of the orbit, but the
    Earth, and your location, would be at a different position, and the
    decay might be 15000 km from you.
    Third, it depends on your location - I used predicted TLEs from
    www.calsky.com and found that using the last computed TLE made the
    last pass only 12 min earlier than using the TLE from noon today.
    
    So, you need to run a prediction - for night,day or shadow, depending
    on the decay time, and watch ALL possible passes.
    
    
    
    2013/4/5 Sankaranarayanan K V <kvsankar@gmail.com>:
    > Thank you, Kevin. The predicted re-entry time has a range of plus/minus 14
    > hours for the prediction epoch 04 APR 2013 @ 07:51:16.125 UTC. Will this
    > converge towards the reentry? How long should I be watching around the
    > reentry time?
    >
    > The site says: 06 APR 2013 @ 16:59 UTC ± 14 hours
    >
    > - Sankar
    >
    >
    > On Fri, Apr 5, 2013 at 5:57 PM, Kevin Fetter <kfetter@yahoo.com> wrote:
    >
    >> I expect a nice light show, it will be bright, ie naked eye range.
    >>
    >> Good luck, and enjoy the show, if you get to see it.
    >>
    >>
    >> --- On Fri, 4/5/13, Sankaranarayanan K V <kvsankar@gmail.com> wrote:
    >>
    >> > What can one
    >> > expect to see?
    >> > How bright would this re-entry be?
    >>
    >>
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