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The STSS-ATRR (Space Tracking and Surveillance System Advanced Technology Risk Reduction), formerly known as STSS Block 2010 Risk Reduction, is a research and development mission for the Missile Defense Agency.

It is intended to explore "alternate technology for potential missile defense application". Reportedly the spacecraft was built by Northrop Grumman Space Technology acting as overall system prime contractor and General Dynamics providing a SA-200HP bus.

Nation: USA
Type / Application: Early warning technology
Operator: Missile Defense Agency (MDA)
Contractors: Northrop Grumman Space Technology ? (prime); General Dynamics Advanced Information Systems ? (bus)
Configuration: SA-200HP
Satellite COSPAR Date LS Launch Vehicle Remarks
STSS-ATTR (USA 205) 2009-023A 05.05.2009 Va SLC-2W Delta-7920-10C

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