The Double Star payload includes eight European instruments and eight Chinese instruments. Seven of the eight European instruments are identical to the ones on Cluster with one, the Neutral Atom Imager, newly built for TC-2.

• Active Spacecraft Potential Control (ASPOC)
• Fluxgate Magnetometer (FGM)
• Hot Ion Analyser (HIA)
• Plasma Electron and Current Experiment (PEACE)
• Spatio-Temporal Analysis of Field Fluctuations and Digital Wave Processor (STAFF/DWP)
• Neutral Atom Detection Unit (NUADU).

Each instrument is built by a team under the leadership of a Principal Investigator (PI). The two instruments FGM and PEACE are built for both TC-1 and TC-2.

Instruments on-board TC-1 and TC-2 

ASPOC