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IGS 4B (Information Gathering Satellite 4B) is one of 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.

Alternate Names

  • 30587
  • Information Gathering Satellite 4B
  • IGS4B

Facts in Brief

Launch Date: 2007-02-24
Launch Vehicle: H-2A
Launch Site: Tanegashima, Japan

Funding Agency

  • Unknown (Japan)


  • Surveillance and Other Military

Additional Information

Questions and comments about this spacecraft can be directed to: Coordinated Request and User Support Office

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