Clark

Part of the SSTI program

Clark was selected in the NASA SSTI (Small Spacecraft Technology Initiative) program, along with Lewis, to demonstrate advanced spacecraft technologies. Contract start was July 11, 1994.

Spacecraft
3-Axis stabilized, zero momentum biased control system with 0.05 deg control and 0.03 deg knowledge. Two solar arrays generate 289W orbit average power. Two 15-Ahr NiH2 CPV batteries. Hydrazine propulsion system with 12.5 kg propellant. 2 Gbit solid state storage. UHF command and telemetry links. 25 Mbps X-band image data downlink. Graphite composite structure.

Payload
Worldview Imaging Corp's panchromatic 3-m resolution, 15-m multispectral resolution with cloud editing capability. Micro-Measuring Air Pollution from Satellites (µMAPS). X-Ray Spectrometer (soft and gamma). Atmospheric Tomography (3D pollution mapping).

Country of Origin	United States
Customer/User	NASA
Manufacturer(s)	CTA, Martin Marietta
Size	36.5 in. hex by 69.5 in.
Launch	Mid-1997 on Lockheed Martin Launch Vehicle (LMLV)
Orbit	475 km, circular, polar, sun synchronous i=97.3 deg
Design Life	3 years (required life is 1 year)