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Space Tracking and Surveillance System Advanced Technology Risk Reduction
Also called USA 205


Designation 34903 / 09023A
Launch date 5 May 2009
Country of origin United States
Mission Military: early warning
Perigee/Apogee 870 km
Inclination 98.9°
Launch vehicle Delta 2 #341

This is the first demonstrator of the Sbirs low program.

The STSS ATRR mission is a space-based sensor component of a layered Ballistic Missile Defense System (BMDS) to detect, track, and intercept ballistic missiles.

These STSS Demonstration satellites will support the BMDS test bed by detecting and tracking missiles in all phases of flight. The test bed will allow the assessment of the STSS system's capabilities and its ability to operate in concert with other parts of a multilayered missile defence architecture.

The satellites achieved full-course tracking of ballistic missiles.

sat-index articles

Technical data


Prime contractor Northrop Grumman
Platform SA-200
Mass at launch approx 2000 kg
Dry mass  
Solar array  
DC power  
Design lifetime  

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