Flight System

Science Payload
The single WISE instrument was a four-channel imager which took overlapping snapshots of the sky. It included:

• HgCdTe and Si:As 10242 arrays at 3.4, 4.6, 12 and 22 microns giving 2.75" pixels (binned to 5.5" in band 4).
• A two-stage solid-hydrogen cryostat to cool detectors and optics.
• A 40-cm telescope and reimaging optics giving 6" FHWM resolution (diffraction-limited to 12" at 23 microns).
• A scan mirror to stabilize the line-of-sight while the spacecraft scans the sky.

Key Spacecraft Characteristics

Mass:	661 kg
Basic Design:	Three-axis stablized. Body fixed solar arrays. Fixed high gain antenna.
Power:	301 W orbit average required, supplied by 2.4m2 GaInP2/GaAs/Ge solar cells: 382 W EOL orbit average.
Telemetry:	Ku-bands to TDRSS during polar passages.
Data Rate:	23 GB per day (compressed)
Data Storage:	96 GB
Propulsion:	None