Forecast Improves: 90 Percent ‘Go’

OA-6 payload being transported from the PHSF to VIF - in transit: photos only of it at the VIF, Pad 41.

Meteorologists with the Air Force’s 45th Space Wing offered an improved forecast for Tuesday night’s launch of a United Launch Alliance Atlas V rocket carrying the Orbital ATK Cygnus spacecraft and more than 3 1/2 tons of experiments and supplies to the International Space Station. Launch time is 11:05 p.m. EDT, the start of a 3-minute window. For continuing updates, you can subscribe to this blog, log on to, and read NASA and NASAKennedy’s Social Media accounts on Facebook and Twitter.

Our continuous countdown coverage will begin here on the Launch Blog and on NASA TV tomorrow at 10 p.m. We will follow all the milestones as the launch team executes their meticulous steps leading up to liftoff, then the climb into orbit and culminating with the separation of the Cygnus and the unfurling of its twin solar arrays. Photo credit: NASA/Dimitrios Gerondidakis