USA-205,[1] also known as Space Tracking and Surveillance System-Advanced Technology Risk Reduction (STSS-ATRR), and previously as Block 2010 Spacecraft Risk Reduction is a satellite formerly operated by the United States Missile Defense Agency. It was launched to demonstrate new technology for missile detection early warning systems (MDEWS).[1] The technology demonstrated on STSS-ATRR was used in the development of the Space Tracking and Surveillance System (STSS) part of the Space-Based Infrared System (SBIRS).[2]

USA-205

Launch of a Delta II rocket carrying an experimental satellite (STSS-ATRR) for the Missile Defense Agency.
Names	STSS-ATRR Block 2010 Spacecraft Risk Reduction
Mission type	U.S. military technology demonstration
Operator	Missile Defense Agency / U.S. Air Force
COSPAR ID	2009-023A
SATCAT no.	34903
Start of mission
Launch date	5 May 2009, 20:24:25 UTC
Rocket	Delta II 7920-10C (Delta D341)
Launch site	Vandenberg, SLC-2W
Contractor	United Launch Alliance
Orbital parameters
Reference system	Geocentric orbit
Regime	Sun-synchronous orbit
Inclination	97.8°

It was launched on a Delta II 7920-10C launch vehicle from Space Launch Complex 2W (SLC-2W) at the Vandenberg Air Force Base (VAFB) in California, at 20:24:25 UTC on 5 May 2009 into a Sun-synchronous orbit (SSO). The launch was conducted by United Launch Alliance.[3]

Operational and administrative control of the Space Tracking and Surveillance System-Advanced Technology Risk Reduction (STSS-ATRR) satellite was transferred to Air Force Space Command (AFSPC), effective 31 January 2011. In addition to successfully demonstrating required on orbit system performance parameters for a prototype sensor technology, STSS-ATRR conducted Space Situational Awareness and related operations on an as-capable basis.[4]

References

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