SBIRS GEO-3 satellite to launch aboard Atlas V rocket

Atlas V NROL-36 standing on Launch Pad at VAFB
 (Credit: United Launch Alliance)

United Launch Alliance's Atlas V rocket will be launching the SBIRS GEO-3 satellite. Built by Lockheed Martin and being launched for the U.S Military to detect missile launches and provide tactical support. The launch is set for January 19th from Launch Complex 41 in Cape Canaveral, Florida with a launch window that opens at 7:46 pm EST. SBIRS is The Space Based Infrared Systems Geosynchronous Earth Orbit and will be the third of this satellite to be launched in 2011 and will replace the old DSP (Defence Support Program) constellation that has been in operation since 1970. The satellite will help in early missile detection using infrared equipment. The rocket will fly in its 401 configuration with a 4m wide fairing and 1 Centaur second stage engine with no SRBs (Solid Rocket Boosters).