Updated USA 186 elements

From: Ted Molczan via Seesat-l <seesat-l_at_satobs.org>
Date: Thu, 2 Apr 2015 21:52:20 -0400
Alberto Rango observed USA 186 running 48 s late and about 1 deg off-track, on 2015 Apr 02 at 18:40 UTC.

I suspect that it manoeuvred several hours earlier to re-boost its apogee, probably near the perigee passage of 15:09:50
UTC, in which case the following elements intersect with the point of manoeuvre and fit Alberto's observation:

                                                         263 X 472 km
1 70000U          15092.76939742  .00038082  00000-0  19332-3 0    06
2 70000  96.9333 131.7829 0155228 302.4399  56.1929 15.65872392    06

The prediction time uncertainty after 24 h is at least 2 minutes, probably more likely to be early than late.

I estimated the pre-manoeuvre orbit from recent observations by Alberto, Kevin Fetter and Brad Young:

USA 186                                                  263 X 437 km
1 28888U 05042A   15092.06870415  .00042213  00000-0  19332-3 0    09
2 28888  96.9333 131.1251 0129473 305.0952  53.8228 15.72015318    04
Arc 20150331.8-0402.08 WRMS resid 0.041 totl 0.033 xtrk

Ted Molczan


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Received on Thu Apr 02 2015 - 20:53:07 UTC

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