Decay watch: 2000 Mar 14

From: Alan Pickup (alan@wingar.demon.co.uk)
Date: Tue Mar 14 2000 - 12:45:37 PST

  • Next message: Leo Barhorst: "Obs 12 march"

    I have updated my Decay Watch page at
              http://www.wingar.demon.co.uk/satevo/dkwatch/
    with the final analysis for #26099 = 00- 13 B = Express 6-A Proton
    rocket.
    
    In its final notice, SpaceCom reports the decay at Mar 14 02:08 UTC +-7m
    at 21.7 S, 135.0 W. The final two elsets, though, are...
    
    Express 6-A Proton r                             147 x 142 km
    1 26099U 00013B   00073.89605066  .11756507  12654-4  18727-3 0   140
    2 26099  51.6283 231.6798 0003859 295.0163 199.1260 16.48149268   287
    Express 6-A Proton r                             129 x 125 km
    1 26099U 00013B   00074.17510417  .11841534  12823-4  63548-4 0   153
    2 26099  51.6284 230.0747 0003031 281.2360  73.1651 16.54772340   323
    
    ...the latter one implying that it was still around for a northbound
    equator crossing at 04:13 UTC.
    
    Excluding last final elset, I get a decay at 01:42 UTC +-50m while
    southbound near 20.2 S, 114.7 W, over the E Pacific. The final elset,
    unless it is fictional, implies a large decrease in drag coefficient,
    which might have happened as the rocket became aligned with the air-flow
    so that it was flying like an arrow. Forcing a SatEvo evolution through
    the equator crossing times implied by elsets at 00073.69, 00073.89 and
    00074.17 leaves a residual of 1.2 sec at an elset at 00073.81, so the
    final elset may not be too far wide of the mark. It is this latter
    evolution that leads to my final decay time at Mar 14 04:56 +-2h near
    2.9 N, 161.5 E. This has it decaying near a southbound equator crossing
    to the N of the Soloman Is, NE of Australia.
    
    Alan
    -- 
     Alan Pickup | COSPAR 2707:  55d53m48.7s N  3d11m51.2s W   156m asl
     Edinburgh   | Tel: +44 (0)131 477 9144     Fax: +44 (0)870 0520750
     Scotland    | SatEvo page:   http://www.wingar.demon.co.uk/satevo/
    
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    This archive was generated by hypermail 2b29 : Tue Mar 14 2000 - 12:47:33 PST