Re: USA 116 search elements

From: Bjoern Gimle (
Date: Sat May 06 2000 - 10:52:50 PDT

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    > It had been my understanding that both spacecraft always manoeuvred within
    > few hours of each other, though I have not fully confirmed this myself. My
    > prediction of 26 April as the most likely manoeuvre date for both objects,
    > based on USA 116's perigee having precessed to the equator on that date,
    but I
    > When I have some free time, I will analyze this possibility. I need to
    I don't have it either, but this is an easy one, since we have good elsets
    for USA 129 before and after.
    > A one day interval between their manoeuvres would have changed this by
    about 10 minutes.
    Indeed - if USA 116 manoeuvred on Apr.26, my observations were off by ten
    minutes, and could not have been of USA 116.
    Running COLA/ALLCOLA on five elsets before against three after (and
    stabilized), all fifteen "collisions" occur near the perigee at about 22:00
    UT on Apr.26.
    Other oddities are :
    It manoeuvred later in the evening, so it was not on an orbit previously
    passing over the Rocky Mountains, but near the Date Line.
    All close encounters computed are 21:50 to 22:14, well before the perigee. I
    see no trace of that comparing the elsets.
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    This archive was generated by hypermail 2b29 : Sat May 06 2000 - 10:57:26 PDT