|Names||SBIRS GEO-1 (SV-1)|
Space-Based Infrared System GEOstationary-1 
|Mission type||Infrared early warning|
|Operator||United States Air Force / United States Space Force|
|Mission duration||12 years (planned)|
10 years, 4 months and 14 days (in progress)
|Spacecraft type||SBIRS GEO|
|Manufacturer||Lockheed Martin Space|
|Launch mass||4,500 kg (9,900 lb)|
|Dimensions||15 m x 6.7 m x 6.1 m|
|Start of mission|
|Launch date||7 May 2011, 18:10 UTC|
|Rocket||Atlas V 401 (AV-022) |
|Launch site||Cape Canaveral, SLC-41|
|Contractor||United Launch Alliance|
|Reference system||Geocentric orbit|
In the mid 1950s, the United States began development of the first space-based missile detection system; the Missile Defense Alarm System (MIDAS), in low Earth orbit. Following the end of the MIDAS programme, plans to deploy an operational system led to the Integrated Missile Early Warning Satellite programme (IMEWS), followed by the Defense Support Program (DSP),
The SBIRS satellites are a replacement for the Defense Support Program early warning system. They are intended to detect ballistic missile launches, as well as various other events in the infrared spectrum, including nuclear explosions, aircraft flights, space object entries and reentries, wildfires and spacecraft launches.
- "SBIRS GEO-1, -2, -3, -4". Gunter's Space Page. 4 November 2020. Retrieved 16 May 2021.
- "Atlas V launches with SBIRS GEO-1 at second attempt". NASASpaceFlight.com. 7 May 2011. Retrieved 16 May 2021.
- "SBIRS GEO-1 Mission Status Center". Spaceflight Now. 7 May 2011. Retrieved 16 May 2021.