Status Report

ULA Atlas OA-4 Cygnus Launch Set for December 6

By SpaceRef Editor
December 6, 2015
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Everything is progressing towards the Atlas V OA-4 launch of the Cygnus spacecraft for Orbital ATK and NASA. The mission is set to lift off on a ULA Atlas V rocket on Sunday, Dec. 6 from Space Launch Complex 41 at Cape Canaveral Air Force Station in Florida. The 30 minute launch window opens at 4:44 p.m. EST. Today’s L-1 forecast shows a 40 percent chance of favorable weather conditions for launch.

Cape Canaveral Air Force Station, Fla. (Dec. 5, 2015) A ULA Atlas V rocket stands ready to launch OA-4 spacecraft to for Orbital ATK and NASA.
Photo credit: United Launch Alliance

Additional Atlas V photos and the Atlas V OA-4 mission profile video are located here:

L-0: Sunday, Dec. 6
· 3:45 p.m.: The OA-4 launch coverage begins. The web cast is available at
· 4:44 p.m.: Opening of the launch window

Weather Forecast
Overall probability of violating weather constraints: 60%
Primary concerns: Ground Winds, Cumulus Clouds

Overall probability of violating weather constraints for 24 hour delay: 30%
Primary concerns: Cumulus Clouds, Ground Winds

SpaceRef staff editor.