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STPSat 4

STPSat 4 [USAF Academy]

STPSat 4 is an experimental spacecraft for the Department of Defense's Space Test Program (STP).

STPSat-4 carries several experiment packages into low earth orbit. One of these is the MSA (Modular solar array).

  • iMESA-R (Integrated Miniaturized Electrostatic Analyzer Reflight) a U.S. Air Force Academy mission designed to measure plasma densities and energies, which assembles a long-term database with multiple data points for space weather environmental data.
  • MATRS (Modular Solar Array) requires exposure to synergistic space environment at a high integration level (solar cells, interconnections, harnesses), and collects this on-orbit synergistic data for solar array model correlation and validation.
  • RF Modular Tiles requires experimentation to prove enabling phased array technology performance and address fundamental issues in the combined-effects environment of LEO.
  • NISTEx (Navy Interferometric Star Tracker Experiment) observes how well its star tracker detects and tracks stars and how well an interferometric star tracker determines the orientation of a spacecraft.
  • NTE (Nanosatellite Tracking Experiment) - Passive Retroreflector.

STPSat-4 is a free flying spacecraft to be ejected from the international space station (ISS) via the SSIKLOPS (Space Station Integrated Kinetic Launcher for Orbital Payload Systems) deployment system. Launch is scheduled for 2018.

Nation: USA
Type / Application: Technology
Operator: USAF STP (Space Test Program)
Equipment: MSA, iMESA-R, ?
Power: Solar arrays, batteries
Orbit: 400 km × 400 km, 51.6° (typical)
Satellite COSPAR Date LS Launch Vehicle Remarks
STPSat 4 - 2018 with ?
Further STPSat missions:
Further STP missions: