BY JUSTIN RAY
Follow the countdown and launch of the U.S. Air Force Titan 4B rocket and the Defense Support Program-21 satellite. Reload this page for the very latest on the mission.
Top: Titan 4B rocket lifts off (Spaceflight Now photo); Botton: DSP-21 mission patch (USAF photo).
Flight data file
Vehicle: Titan 4B/IUS (B-31)
Launch date: Aug. 6, 2001
Launch window: 3:28-7:28 a.m. EDT (0728-1128 GMT)
Launch site: SLC-40, Cape Canaveral, Fla.
Launch timeline - Chart with times and descriptions of events to occur during the launch.
Titan 4B vehicle data - Overview of the rocket to be used in this launch.
DSP-21 - Description of the Defense Support Program satellite system.