MAP launch timeline
Updated: June 27, 2001

T-0:00:00.0 Liftoff
The Delta 2 rocket's main engine and twin vernier steering thrusters are started moments before launch. The four strap-on solid rocket motors are ignited at T-0 to begin the mission.
T+0:01:03.1 SRM Burnout
The four Alliant TechSystems-built solid rocket motors consume all their propellant and burn out.
T+0:01:08.0 Jettison SRMs
The four spent ground-started solid rocket boosters are jettisoned in to fall into the Atlantic Ocean.
T+0:04:24.0 Main Engine Cutoff
After consuming its RP-1 fuel and liquid oxygen, the Rocketdyne RS-27A first stage main engine is shut down. The vernier engines cut off moments later.
T+0:04:32.0 Stage Separation
The Delta rocket's first stage is separated now, having completed its job. The spent stage will fall into the Atlantic Ocean.
T+0:04:37.5 Second Stage Ignition
With the stage jettisoned, the rocket's second stage takes over. The Aerojet AJ10-118K liquid-fueled engine ignites for the first of two firings needed to boost the upper stage and MAP spacecraft into the proper orbit.
T+0:04:58.0 Jettison Payload Fairing
The 10-foot diameter composite payload fairing that protected the MAP satellite atop the Delta 2 during the atmospheric ascent is jettisoned is two halves.
T+0:11:36.4 Second Stage Cutoff 1
The second stage engine shuts down to complete its first firing of the launch. The rocket and attached MAP spacecraft now begin a 66-minute coast period before the second stage reignites. The orbit achieved should be approx. 93.5 by 107.8 nautical miles, inclined 28.75 deg.
T+1:17:43.0 Second Stage Restart
Delta's second stage engine reignites for a short firing to raise the orbital altitude.
T+1:17:47.2 Second Stage Cutoff 2
The second stage shuts down after a 4-second burst to reach an orbit of 97.8 by 166.4 nautical miles inclined 28.75 degrees. Over the next minute, tiny thrusters on the side of the rocket will be fired to spin up the vehicle in preparation for stage separation.
T+1:18:40.2 Stage Separation
The liquid-fueled second stage is jettisoned from the rest of the Delta 2 rocket having completed its role in the launch.
T+1:19:17.2 Third Stage Ignition
The Thiokol Star 48B solid-fueled third stage is then ignited to propel MAP away from Earth. A nutation control system featuring a thruster on an arm mounted on the side of the stage will be used to maintain stability during the burn.
T+1:20:45.0 Third Stage Burnout
Having used up all its solid-propellant, the third stage burns out to completed the powered phase of the launch sequence. In about four-and-a-half minutes, two small yo-yo-like structures are released from the third stage to reduce the spinning motion the Delta rocket and MAP are experiencing in preparation for satellite separation.
T+1:25:32.2 Spacecraft Separation
NASA's Microwave Anisotropy Probe spacecraft is deployed from the Delta 2 rocket to begin its three-month journey to the Lagrange (L2) point located a million miles from Earth.

Data source: Boeing.

Flight Data File
Vehicle: Delta 2 (7425)
Payload: MAP
Launch date: June 30, 2001
Launch time: 3:46:46 p.m. EDT (1946:46 GMT)
Launch site: SLC-17B, Cape Canaveral, Florida
Satellite broadcast: GE-2, Trans. 9, C-band

Pre-launch briefing
Ground track - Trace the Delta rocket's trek during launch.

Restricted zone - Map outlining the Launch Hazard Area where mariners should remain clear for the liftoff.

Delta 2 rocket - Overview of the Delta 2 7425-model rocket used to launch MAP.

Microwave Anisotropy Probe - Technical look at the spacecraft and its systems.

Mission science - Overview of the scientific objectives of MAP.

Delta directory - See our coverage of preview Delta rocket flights.