Spaceflight Now Home

The Mission

Rocket: Atlas 5 (AV-019)
Payload: AEHF 1
Date: August 14, 2010
Window: 7:07-9:06 a.m. EDT (1107-1306 GMT)
Site: SLC-41, Cape Canaveral, Florida
Feed: Galaxy 3, C-band, Transponder 8, 95° West

Mission Status Center

Photos: Launch gallery

Photos: Press site view

Photos: On the pad

Photos: Rocket rollout

Photos: Satellite preps

Rocket configuration

Ascent events timeline

Ground track map

Lockheed brochure

AEHF fact sheet

Profile story

Prelaunch update

Our Atlas archive


Sign up for our NewsAlert service and have the latest news in astronomy and space e-mailed direct to your desktop.

Enter your e-mail address:

Privacy note: your e-mail address will not be used for any other purpose.

Atlas/AEHF launch timeline
Posted: July 28, 2010

T-00:02.7 Engine Start
The Russian-designed RD-180 main engine is ignited and undergoes checkout prior to launch.
T+00:01.1 Liftoff
The three strap-on solid rocket boosters are lit as the Atlas 5 vehicle, designated AV-019, lifts off and begins a vertical rise away from Complex 41 at Cape Canaveral Air Force Station, Florida.
T+01:56 Jettison SRBs
Having burned out of propellant approximately 25 seconds earlier, the spent solid rocket boosters are jettisoned to fall into the Atlantic Ocean.
T+03:27 Nose Cone Jettison
The payload fairing that protected the AEHF 1 spacecraft during launch is separated once heating levels drop to predetermined limits.
T+03:33 Forward Load Reactor Jettison
The Forward Load Reactor deck that supported the payload fairing's structure to Centaur upper stage is released six seconds after the shroud's jettison.
T+04:17 Main Engine Cutoff
The RD-180 main engine completes its firing after consuming its kerosene and liquid oxygen fuel supply in the Atlas first stage.
T+04:23 Stage Separation
The Common Core Booster first stage of the Atlas 5 rocket separates from the Centaur upper stage. Over the next few seconds, the Centaur engine liquid hydrogen and liquid oxygen systems are readied for ignition.
T+04:33 Centaur Ignition 1
The Centaur RL10 engine ignites for the longer of the two upper stage firings. This burn will inject the Centaur stage and AEHF 1 spacecraft into a parking orbit.
T+14:08 Centaur Cutoff 1
The Centaur engine shuts down after arriving in a planned parking orbit. The vehicle enters a brief coast period lasting nearly 8 minutes before arriving at the required location in space for the second burn.
T+22:17 Centaur Ignition 2
The Centaur re-ignites over the equatorial Atlantic to accelerate the payload into geosynchronous transfer orbit from the parking achieved earlier in the launch sequence.
T+27:37 Centaur Cutoff 2
At the conclusion of its second firing, the Centaur will have delivered the AEHF 1 spacecraft into the targeted orbit with an apogee of 22,236 statute miles, perigee of 119 statute miles and inclination of 27 degrees.
T+51:00 Spacecraft Separation
The U.S. military's first Advanced Extremely High Frequency communications satellite is released into orbit from the Centaur upper stage to complete the AV-019 launch.

Data source: United Launch Alliance.




© 2014 Spaceflight Now Inc.