Re: STS-108 Launch Obs - Maryland

From: Bjorn Gimle \(TietoEnator\) (bjorn.gimle@tietotech.se)
Date: Tue Dec 11 2001 - 14:06:04 EST

  • Next message: Daniel Deak: "Re: STS-108 Launch Obs - Maryland"

    Using this info from Jonathan's Space Report 469:
    >...
    >Space Shuttle mission STS-108 (ISS mission UF-1) was launched on Dec 5
    >at 2219:28 UTC. Endeavour reached an orbit of approximately 58 x 230 km
    >(according to the NASA PAO) at 2228 UTC. At 2259 UTC Endeavour fired
    >its OMS engines to raise perigee to 225 km. Mass after OMS-2 was
    >...
    and Daniel Deak's OIG predicted orbit (for the first launch attempt, but
    still matches the figures above)
    STS-108 (OMS-1)                                  228 x 57
    1 99108U          01339.00611734  .00000000  00000-0  10050-9 0  9004
    2 99108  51.6378 310.0696 0131698 348.8100  11.0180 16.48778271    20
    and assuming that the OMS-1 burn was made at the 230 km apogee, I get the
    altitude 31 minutes earlier (launch+8.5 min) as 92 km.
    
    In contrast, the SkyMap.trj I was using has after 8.5 minutes:
    510  37.552  -69.261  104.860834
    i.e. 12 km HIGHER, and at the end (35 min)
    2100  16.638  53.085  301.676184
    - far too high.
    
    So why would predictions be too low?
    
    ----- Original Message -----
    ...
    >
    > Question:  I used the "shuttle.trj" file from the archives in Skymap.
    This,
    > along with several other sources, indicated a maximum altitude of about 7
    > degrees for DC.  However, as noted above, the actual path was easily twice
    > as high.  Since this file was generated several years ago for one of the
    Mir
    > flights, I'm wondering if there has been a change in the ascent profile
    for
    > flights to ISS?  I know that they are phasing in new SSME's and SRM's, and
    > there are some new maneuvers that are beign executed during powered ascent
    > to place the shuttle in better orientation for TDRSS relay.  Any thoughts
    on
    > this?
    >
    
    
    
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