I have derived the following from Greg Roberts' recent observations: For arc 2002 Dec 19 - 2003 Jan 01 UTC: USA 116 15.0 3.0 0.0 4.7 v 1 23728U 95066A 03001.03911374 .00005100 00000-0 27649-3 0 00 2 23728 97.9371 121.8583 0302814 36.5799 325.5681 14.82950176 08 For arc 2002 Dec 18 - 31 UTC: USA 129 15.0 3.0 0.0 5.3 v 1 24680U 96072A 02365.90131724 .00035161 00000-0 39527-3 0 05 2 24680 97.8525 66.4118 0495058 194.5565 164.0948 14.83147731 01 For arc 2002 Dec 18 - 31 UTC: USA 161 15.0 4.0 0.0 5.4 v 1 26934U 01044A 02365.99644307 .00005214 00000-0 28106-3 0 06 2 26934 97.9061 115.6631 0308330 70.0280 293.3858 14.82178320 09 All have WRMS error less than 0.01 deg KeyHole re-boost manoeuvres often occur near when their argument of perigee passes over the equator, i.e. argument of perigee = 0 deg or 180 deg. On 2003 Jan 05, USA 129's argument of perigee will cross the equator. Also, its mean motion has grown to a value that is ripe for a manoeuvre. Here is its above elset, propagated to ascending node nearest to arg perigee = 180 deg on Jan 05: 1 70000U 03005.35385446 .00035215 00000-0 39527-3 0 01 2 70000 97.8525 70.8094 0493719 179.9580 180.1767 14.83460838 00 The argument of perigee need not be exactly at the equator, so the re-boost could occur as early as Jan 04. One or both of the other KeyHoles could manoeuvre at about the same time as USA 129. The KeyHoles currently are in visibility windows at mid-Southern Hemisphere latitudes. Ted Molczan ----------------------------------------------------------------- Unsubscribe from SeeSat-L by sending a message with 'unsubscribe' in the SUBJECT to SeeSat-L-request@lists.satellite.eu.org http://www.satellite.eu.org/seesat/seesatindex.html
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