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ST5-B is one of the first three microsatellites in the Space Technology 5 mission of the American (NASA) New Millennium Program. They were launched at 14:04 UT on 22 March 2006 by a Pegasus XL rocket that was released from the belly of a Lockheed L-1011 plane flying out of Vandenberg AFB. Each, with a mass of 25 kg and power 20 W, is octagon-shaped (53 cm x 48 cm). Each is called a "full service" satellite, capable of orbit/attitude maneuver and radio links. In all, about 10 innovative, miniaturized technology advances will be tested during the 90-day operational span. Among them are variable emittance coatings (to heat when cold and cool when hot), metal oxide logic circuits that can operate at 0.5 volts, miniature magnetometers, and miniature, spinning Sun-sensors. They will orbit in a "string of pearls" formation. After success with this mission, the hope is to launch many such microsatellites to better understand the space weather impacts.

Alternate Names

  • 28981

Facts in Brief

Launch Date: 2006-03-22
Launch Vehicle: Pegasus XL
Launch Site: Vandenberg AFB, United States
Mass: 25 kg
Nominal Power: 20 W

Funding Agency

  • National Aeronautics and Space Administration (United States)


  • Technology Applications
  • Engineering

Additional Information

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



NameRoleOriginal AffiliationE-mail
Dr. James A. SlavinProject ScientistNASA Goddard Space Flight
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