Re: Ariane 5 Debris ( SYLDA Dispenser ) decay info

From: Sankaranarayanan K V (kvsankar@gmail.com)
Date: Sat Apr 06 2013 - 06:39:31 UTC

  • Next message: C. Bassa: "CB Obs April 5/6, 2013"

    Thank you, Björn. Reading earlier posts on this thread I just realized
    I hadn't really thought through how the altitude of re-entry would affect
    the visibility.
    
    Going through the heavens-above predictions, I see that I have only
    day-time passes and
    most of them are low in altitude (as seen from my site, Bangalore, 12.9833°
    N, 77.5833° E).
    
    - Sankar
    
    
    On Sat, Apr 6, 2013 at 12:55 AM, Björn Gimle <bjorn.gimle@gmail.com> wrote:
    
    > Don't forget Heavens-Above, it allows you to select daylight and
    > nightly "invisible" passes.
    >
    > At the moment though it predicts passes up to Apr 08 !
    >
    > Example:
    >
    > http://www.heavens-above.com/PassSummary.aspx?satid=30796&lat=-6.16667&lng=106.8&loc=Jakarta&alt=1&tz=UCTm7
    > and select "all" !
    >
    > 2013/4/5 Björn Gimle <bjorn.gimle@gmail.com>:
    > > 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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