FIA Radar 2: post manoeuvre elements

From: Ted Molczan (ssl3molcz@rogers.com)
Date: Sat Apr 14 2012 - 14:24:08 UTC

  • Next message: Jean Paul CORNEC: "JPC Obs of FIA Radar 2"

    Overnight, Russell Eberst, Marco Langbroek and Scott Tilley detected that FIA Radar 2 (12014A / 38109) had manoeuvred.
    Marco and Scott found it running considerably early, and reported observations, which yield preliminary updated
    elements:
    
    FIA Radar 2                                            1066 X 1096 km
    1 38109U 12014A   12105.33721777  .00000000  00000-0  00000-0 0    08
    2 38109 123.0122 249.7397 0020085 231.3101 128.6065 13.47529876    01
    Arc 20120413.84-0414.35 WRMS resid 0.022 totl 0.017 xtrk
    
    The manoeuvre occurred on 2012 Apr 12 near 20:54 UTC, during a high elevation pass of AFSCN Oakhanger. The magnitude
    was approximately 5.9 m/s; and the main results were a decrease of perigee of about 15 km, and rotation of the line of
    apsides by about -65 deg; the latter estimate could change considerably with further observation.
    
    Several more manoeuvres can be expected over the next couple of weeks or so, until a frozen orbit has been achieved,
    with mean argument of perigee near 90 deg, and dimensions matching those of FIA Radar 1: 1101 X 1107 km. I suspect there
    is an optimal spacing between the spacecraft in time of node crossing, that will also have been achieved by the
    conclusion of the manoeuvres.
    
    Ted Molczan
    
    
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