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SDS 4 (Small Demonstration Satellite 4) is a small technology experiment satellite developed by JAXA.

As SDS-1, this small satellite (a cube of 50 kg and 50 cm edge, with a 120 W power available) will test several promising technologies. Unlike the SDS-1 satellite attitude SDS-4 can be controlled on its 3-axis pointing toward the Sun in normal operation phase and to Earth at nadir during his experimental phase. SDS-4 to be launched in 2011 with the GCOM-W1 satellite, and placed on a sun-synchronous orbit at 677 km altitude.

SDS-4 will carry four technology validation missions:

  • FOX (FHP On-orbit Experiment) will validate the new orbit flat heat pipes for future thermal control systems for satellites.
  • IST (In-flight experiment of Space Materials using THERME) characterize the degradation of thermal control materials, using the component THERME provided by the French space agency.
  • QCM (Quartz Crystal Microbalance) will characterize a quartz microbalance developed by the scientific division of JAXA (ISAS), a component that will be useful to develop future sensors that will measure internal contamination.
  • SPAISE (Space-based Automatic Identification System Experiment), an experiment of receiving signals AIS (Automatic Identification System) from ships, with two dedicated antennas.
Nation: Japan
Type / Application: Technology
Operator: JAXA
Power: 2 deployable fixed solar arrays, batteries
Mass: 50 kg
Orbit: 662 km × 673 km, 98.17
Satellite COSPAR Date LS Launch Vehicle Remarks
SDS 4 2012-025C 17.05.2012 Ta YLP-1 H-2A-202 with GCOM-W, KOMPSat 3, Horyu 2
Further SDS (JAXA) missions: