A SpaceX Falcon 9 rocket is scheduled for launch today is targeted from complex 4-East at Vandenberg Air Force Base in California for 10:31:33 a.m. EDT.
This is an "instantaneous" launch window. This means the rocket must take off on time or the flight will have to be moved to Saturday, the nexts available window.
The Falcon 9 will be carrying a payload of 10 Iridium NEXT satellites. This is the eighth and final set of satellites in a series of 75 that have been deployed.