Information Gathering Satellites

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IGS 4A and IGS 4B (Information Gathering Satellites 4A and 4B) are a pair of Japanese military reconnaissance satellites that were launched by an H-2 rocket from Tanegashima Space Center at 04:41 UT on 24 February 2007. They are intended to provide early warning of impending hostile launches in the neighborhood. One of them uses a radar and the other optical telescopes to sight such launches, but the capabilities are not matched to the names. The initial orbital parameters of both are similar: period 94.4 min, apogee 494 km, perigee 481 km, and inclination 97.2°.[1]

[edit] References

  1. ^ SPACEWARN Bulletin, No. 640. National Space Science Data Center/World Data Center for Satellite Information (01 March 2007).


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