10:24 p.m. EDT (0224 UTC)The Centaur liquid oxygen tank is half full.
10:29 p.m. EDT (0229 UTC)The Centaur upper stage's liquid oxygen tank has reached the 75 percent level as filling continues.The chilldown conditioning of liquid hydrogen propellant lines at Space Launch Complex 41 is starting to prepare the plumbing for transferring the Minus-423-degree F fuel into the rocket.
10:30 p.m. EDT (0230 UTC)Filling of the Atlas V rocket’s largest tank has begun. About 48,800 gallons of super-cold oxidizer for the main engine is flowing into the liquid oxygen tank on common core booster first stage.