RE: Question about USA 89 r

From: Ted Molczan via Seesat-l <seesat-l_at_satobs.org>
Date: Sun, 18 Sep 2016 19:21:32 -0400
I omitted to mention that the only observational evidence of the mission of USA 89 that comes to mind occurred during
the time it was in its LEO parking orbit. Its brightness varied regularly over a period of 1 s, the same as SDS 2-1
(89061B / 20167), SDS 2-3 (90097B  / 20963 ) and SDS 2-4 (96038A / 23945), which were also observed in LEO. The
variation was due to rotation at 30 RPM, for spin stabilization. Colleagues determined that USA 89 was headed to a
Molniya orbit, based on the rate of movement of the planar launch window of the shuttle that launched it in December
1992.

Ted Molczan


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Received on Sun Sep 18 2016 - 18:22:16 UTC

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