1 00:00:01,080 --> 00:00:03,330 \h George Diller/NASA Launch Commentator: From Cape Canaveral in Florida this is 2 00:00:03,330 --> 00:00:07,860 \h Atlas Launch Control at T-2 hours and holding. 3 00:00:07,860 --> 00:00:15,340 \h We're now just 2 1/2 hours away from the liftoff of NASA's TDRS-K, Tracking and Data Relay Satellite. 4 00:00:15,340 --> 00:00:21,770 \h Launch is atop a United Launch Alliance Atlas V rocket from Launch Complex 41 at Cape Canaveral. 5 00:00:21,770 --> 00:00:31,500 \h The launch window today extends from 8:48 to 9:28 p.m. EST. 6 00:00:31,500 --> 00:00:35,320 \h The launch window tonight is 40 minutes in duration. 7 00:00:35,320 --> 00:00:42,310 \h This will be the 35th Atlas V rocket to be launched from Cape Canaveral Air Force Station. 8 00:00:42,310 --> 00:00:46,330 \h The TDRS-K Tracking and Data Relay Satellite will relay voice, 9 00:00:46,330 --> 00:00:52,350 \h data and telemetry communications between spacecraft and Earth orbit and ground controllers. 10 00:00:52,350 --> 00:00:58,710 \h This includes the International Space Station, the Hubble Space Telescope and scientific satellites. 11 00:00:58,710 --> 00:01:04,320 \h Even the Atlas rocket launching tonight with TDRS-K will be tracked using the TDRS system in orbit, 12 00:01:04,320 --> 00:01:11,420 \h taking over from the tracking stations of the Eastern Range beginning about 6 1/2 minutes into the flight. 13 00:01:11,420 --> 00:01:15,660 \h Ten Tracking and Data Relay Satellites have been launched since the first one launched from the 14 00:01:15,660 --> 00:01:21,070 \h space shuttle on April 4, 1983, almost exactly 30 years ago. 15 00:01:21,070 --> 00:01:25,960 \h The TDRS system allows almost constant space communication. 16 00:01:25,960 --> 00:01:29,560 \h Because of the reliability and longevity of the system, 17 00:01:29,560 --> 00:01:39,400 \h TDRS-K is the first one to be launched by NASA that the agency has needed since 2002, over 10 years ago. 18 00:01:39,400 --> 00:01:45,580 \h The spacecraft was built for NASA by Boeing Space Systems. 19 00:01:45,580 --> 00:01:51,850 \h So at this time we are awaiting our poll from the NASA Launch Director Tim Dunn of the 20 00:01:51,850 --> 00:01:56,410 \h NASA launch team and that will be followed by the poll of the Atlas team to 21 00:01:56,410 --> 00:02:03,630 \h begin tanking of the Atlas V rocket with cryogenic propellants.