2:41 a.m.Countdown enters a two-hour planned hold at T-6 hours
4:06 a.m.
Mission Management Team meets to give a "go" to begin fueling Atlantis' external tank
4:41 a.m.
Countdown resumes at the T-6 hour mark with the fueling of Atlantis
5:30 a.m.
STS-125 astronauts wake up for launch
6:00 a.m.
Atlantis' astronauts undergo final medical exams
7:41 a.m.
Countdown enters a two-hour, 30-minute hold at T-3 hours; fueling enters stable replenish
8:30 a.m.Live launch coverage begins on NASA TV and Launch Blog
10:11 a.m.
Countdown resumes at T-3 hours
10:16 a.m. Atlantis astronauts depart crew quarters for Launch Pad 39A
10:46 a.m.
Astronauts arrive at the launch pad and begin to board Atlantis
12:01 p.m.
Atlantis' hatch is closed and latched for launch
12:51 p.m. Countdown enters a 10-minute planned hold at the T-20 minute mark
1:01 p.m. Countdown resumes at the T-20 minute mark
1:12 p.m. Countdown enters a 40-minute planned hold at the T-9 minute mark, during which the Mission Management Team, and Launch Control team will conduct polls to give a final "go" decision for launch
1:52 p.m. Countdown resumes at the T-9 minute mark
1:56 p.m. Auxiliary Power Units start at the T-5 minute mark
2:01:49 p.m. Atlantis launches on the STS-125 mission
2:10:19 p.m.Main Engine Cut Off (MECO)