Launch Profile – SBIRS GEO-4

Time	Event
T-0:00:02.7	Stage 1 - RD-180 Ignition
T-0	Booster Ignition
T+0:00:01.1	Liftoff
T+0:00:02.1	Full Thrust Level
T+0:00:06.8	Pitch/Roll Maneuver Initiation
T+0:00:57.9	Mach 1
T+0:01:11:2	Maximum Dynamic Pressure
T+0:02:20:5	SRB Jettison
	RL-10C Boost Phase Cool-Down
	Centaur RCS Pyro Valve Initiation
	Stage 1 Throttle down for MECO
T+0:04:03.3	Main Engine Cutoff
T+0:04:09.3	Atlas/Centaur Separation
T+0:04:19.2	Centaur Ignition 1 - Burn Duration: 09:30.7
T+0:04:27.3	Payload Fairing Jettison
T+0:13:49.9	Centaur Cutoff 1
T+0:13:49.9	Coast Phase - Duration: 10:26.9
T+0:24:16.8	Centaur Ignition 2 - Burn Duration: 5:01.8
T+0:29:18.6	Centaur Cutoff 2
T+0:42:31.6	SBIRS GEO-4 Separation
	Centaur CCAM, Coast Phase
T+1:14:17.2	Centaur Deorbit Burn
T+1:14:27.2	Centaur Shutdown
T+9:24:57.1	Ocean Impact

Launch Vehicle: Atlas V 401

Launch Site: SLC-41 Cape Canaveral

Launch Date: January 20, 2018
Window: 00:48-01:28 UTC
Payload: SBIRS-GEO 4 (~4,500kg)

Flight Azimuth: 95.9°

Target Orbit:

Type: Geostationary Transfer Orbit

Perigee: 185.2 Kilometers
Apogee: 35,851 Kilometers
Inclination: 16.88 Degrees

Argument of Perigee: 178.0°

Image: ULA

Credit: United Launch Alliance