STS 107 waste water dump schedule

From: Ted Molczan (
Date: Mon Jan 20 2003 - 16:40:23 EST

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    Thanks to Glenn Talbert's post yesterday, I now understand that the start and end of waste water dumps are denoted in the flight
    plans using the mostly opaque terms SIMO INIT and SIMO TERM.
    Here are the currently scheduled waste water dump periods for the remainder of STS 107:
     Date         UTC
    Jan 22   17:45 to 19:05
    Jan 26   02:40 to 04:10
    Jan 28   17:25 to 18:55
    Jan 31   04:35 to 05:40
    A waste water dump is visible to the unaided eye as an illuminated plume extending from the shuttle, creating a surreal looking
    comet. The water freezes into ice crystals which reflect sunlight, so the phenomenon is visible only when the plume is in sunlight,
    and the observer in darkness.
    Please note that in the flight plan, the start and end times appear to fall within a 15 min range. This may have more to do with
    having to providing sufficient space to print the words SIMO INIT and SIMO TERM. In any case, the above start times are the earliest
    shown and the end times are the latest shown.
    A quick look at the above schedule and the shuttle's predicted ground track indicates that North American observers will not see any
    of the dumps.
    On Jan 22 and 28, South Africa will have passes during water dumps, but both occur near sunset. The orbiter should be visible, but
    the plume is likely to be too faint to be seen against the bright sky.
    On Jan 31, The Mediterranean should have a great view of the final water dump when the shuttle emerges from eclipse at about 05:08
    UTC. For example, Rome's pass will culminate about 40 deg in the south.
    Observers elsewhere on Earth should run predictions to determine whether or not they will have favourable passes during the above
    periods. Always use the latest shuttle elements, in case it manoeuvres. Also, please be aware that the water dump schedule could
    change. The schedules are available here:
    Ted Molczan
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