TechSat-21

TechSat-21 (Technology Satellite of the 21st Century) was a small spacecraft developed by the U.S. Air Force Research Laboratory's Space Vehicles Directorate to test technology for formation flight of spacecraft which can rapidly change formation based on mission requirements.^[1] The project was canceled in 2003 due to numerous cost overruns.^[2]

TechSat-21

Artist's rendition
Mission type	Technology
Operator	AFRL, STP, NASA
Spacecraft properties
Manufacturer	MicroSat Systems
Launch mass	181 kilograms (399 lb)
Start of mission
Launch date	Not launched
Rocket	Atlas V 401
Launch site	Cape Canaveral SLC-41
Orbital parameters
Reference system	Geocentric
Regime	Low Earth
Perigee altitude	560 kilometers (350 mi)
Apogee altitude	560 kilometers (350 mi)
Inclination	35.4& degrees
Epoch	Planned