Vanguard 1A was a small satellite designed to test the launch capabilities of the geodetic measurements through orbit analysis.
2.
But the orbit analysis had failed to take into consideration the influence of the Moon at such high apogees and the perigee started to drop dangerously fast.
3.
STK was first adopted by the aerospace community for orbit analysis and access calculations ( when a satellite can see a ground-station or image target ), but as the software was expanded, more modules were added that included the ability to perform calculations for communications systems, radar, interplanetary missions and orbit collision avoidance.
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