STS 131 Ascent to ISS Trajectory Spreadsheet

From: Ted Molczan (ssl3molcz@rogers.com)
Date: Sat Mar 27 2010 - 00:55:40 UTC

  • Next message: Skywayinc@aol.com: "Re: STS 131 Ascent to ISS Trajectory Spreadsheet"

    The ascent trajectory and look angles are primarily of interest to observers
    near the east coast of North America, interested in observing the shuttle
    during its ascent to orbit. STS 131 will be launched at night, but will
    begin to exit eclipse about 3 min after launch. The sun will be above the
    horizon at more northerly latitudes, making visbility more challenging than
    usual.
    
    I have produced an MS Excel spreadsheet to compute azimuth, elevation, R.A.
    and Dec, an indication whether the shuttle is in sunlight, or the umbra or
    penumbra of Earth's shadow, and the fraction of illumination (based on a
    sphere), during STS 131's ascent to orbit on its mission to ISS:
    
    http://satobs.org/seesat_ref/Shuttle/STS_131_Ascent_Trajectory_to_ISS.xls
    
    To use, enter your observation site co-ordinates and the date and time of
    lift-off, in the specially labelled cells (those with red coloured font).
    
    The spreadsheet is set up for STS 131's scheduled launch on 2010 Apr 05 at
    10:21:22 UTC, as seen from Washington, D.C.
    
    I obtained the trajectory data from The CBS News Space Reporter's Handbook,
    by William Harwood:
    
    http://www.cbsnews.com/network/news/space/downloads.html
    
    Scroll down to the SpaceCalc section, and see file SpaceCalcPC_131.zip for
    PC or SpaceCalcMac_131.zip for Mac.
    
    Ted Molczan
    
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