Re: WGS 6 search elements; fuel dump events

From: Jon Mikel (jonmikelk@gmail.com)
Date: Wed Aug 07 2013 - 18:25:44 UTC

  • Next message: Chris Jones: "Re: WGS 6 search elements; fuel dump events"

    What is the purpose of the n2h4 in the centaur stage? I thought that
    centaur only uses criogenic propelant in his single thruster
    El 07/08/2013 19:33, "Ted Molczan" <ssl3molcz@rogers.com> escribió:
    
    > WGS 6 is scheduled for launch from Cape Canaveral on a Delta 4
    > Medium+(5,4) in about 7 hours, on 2013 Aug 08, between
    > 00:29 and 01:18 UTC.
    >
    > http://www.spaceflightnow.com/delta/d363/status.html
    >
    > I offer the following rough TLE of the orbit after the final burn of the
    > 2nd stage, assuming launch at window-open:
    >
    > SECO-2                                                 441 X 66941 km
    > 1 78902U          13220.04208334  .00000000  00000-0  00000-0 0    01
    > 2 78902  24.0048 143.0393 8298200 177.8402   1.4113  1.08259000    02
    >
    > Following spacecraft separation, observers within range should look for
    > the following 2nd stage events (times
    > approximate):
    >
    >     T+       UTC
    > 00:45:00  01:14:00  CCAM Start (Collision and Contamination Avoidance
    > Manoeuvre)
    > 00:47:20  01:16:20  CCAM End
    > 00:54:41  01:23:41  H2 Depletion End
    > 00:56:40  01:25:40  O2 Depletion End
    > 01:18:33  01:47:33  N2H4 depletion End
    >
    > The fuel dump could produce a spectacular comet-like phenomenon, similar
    > to that of WGS 4, imaged last year despite
    > challenging conditions, by Willie Koorts:
    >
    > http://satobs.org/seesat/Jan-2012/0270.html
    >
    > Ted Molczan
    >
    >
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    >
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