AEHF 1 estimated post-manoeuvre elements

From: Ted Molczan (
Date: Fri Oct 15 2010 - 17:31:18 UTC

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    Mike McCants and I contributed the observations used to determine the following element set.
    The epoch corresponds to the time of my final observation, on 2010 Oct 15, at about 08:05 UTC.
    AEHF 1                                                4733 X 49975 km
    1 36868U 10039A   10288.33712838  .00000000  00000-0  00000-0 0    01
    2 36868  15.0671 296.7537 6706000 202.6164 342.5638  1.40150000    04
    Arc 20101015.13-1015.34 WRMS resid 0.007 totl 0.004 xtrk
    I consider this estimate somewhat rough, given the short arc, but barring further manoeuvring, I
    believe it will be accurate to within a few tens of seconds of time, tonight.
    The main changes relative the previous orbit are an increase in perigee height of about 19 km, and a
    decrease in inclination of about 0.02 deg, probably the result of firing the HCTs (Hall Current
    Thrusters). Total delta-V is about 1.3 m/s, which implies HCT burns totalling about 6 hours,
    assuming thrust ~0.07 lbs, and Isp ~1800 s. About 0.37 kg of Xenon fuel would have been consumed.
    There is quite a bit of technical data on AEHF's HCTs in the 2003 paper, "The Development And
    Qualification Of A 4.5 Kw Hall Thruster Propulsion System For Geo Satellite Applications - Status
    Update", available here:
    Ted Molczan
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