Friday Night Launch Highlights (All times listed in EDT)

5:00 a.m. Crew sleep begins
8:34 a.m. Countdown resumes at the T-11 hour mark
12:00 p.m. Mission Management Team meets to discuss the results of the fill and drain valve testing; will be followed by the tanking meeting to give a “go/no go” for the fueling of Discovery
1:00 p.m. Crew wakeup for launch
1:30 p.m. Astronauts have breakfast
1:34 p.m. Countdown enters a 1-hour built-in hold at the T-6 hour mark
2:00 p.m. Astronauts receive their final medical exams
2:30 p.m. Fueling coverage begins on NASA TV and Web
2:34 p.m. Countdown resumes at the T-6 hour mark with the fueling of Discovery
3:19 p.m. LH sensor go to "wet" state
5:34 p.m. Countdown enters a 2-hour, 30-minute built-in hold at the T-3 hour mark; fueling enters stable replenish
6:30 p.m. Launch coverage begins on NASA TV and Launch Blog
7:39 p.m. Astronauts receive a weather briefing from the Ascent Team of flight controllers at Mission Control, Houston
8:04 p.m. Countdown resumes at T-3 hours
8:09 p.m. Discovery astronauts depart crew quarters for Launch Pad 39A
8:39 p.m. Astronauts arrive at the launch pad and begin to board Discovery
9:54 p.m. Begin closing Discovery's crew hatch
10:44 p.m. Countdown enters a 10-minute planned hold at the T-20 minute mark
10:54 p.m. Countdown resumes at the T-20 minute mark
11:05 p.m. Countdown enters a 45-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
11:50 p.m. Countdown resumes at the T-9 minute mark
11:54 p.m. Auxiliary Power Units start at the T-5 minute mark
11:59 p.m. Discovery launches on the STS-128 mission
12:08 a.m. Main Engine Cut Off (MECO)
Source: NASA