The built-in hold has been released and countdown clocks are ticking again. Liftoff is on schedule for 1:47 a.m. PST. There will be one more built-in hold in the countdown, and that’s a 10-minute hold coming up at the T-4 minute mark.
Both stages of the Delta II rocket have been loaded with RP-1 fuel, which is a rocket-grade kerosene, and cryogenic liquid oxygen.
See how the Delta II rocket and JPSS-1 spacecraft came together for launch: