July 17, 2019

Vega launch timeline with Falcon Eye 1


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The Falcon Eye 1 military reconnaissance satellite for the United Arab Emirates is set to ride a Vega launcher into a 379-mile-high (611-kilometer) orbit Wednesday night from French Guiana on a mission that will take less than one hour from liftoff until spacecraft separation.

Liftoff is scheduled for July 10 at 9:53:03 p.m. EDT (0153:03 GMT on July 11) from the Vega launch pad at the Guiana Space Center, located on the northeastern coast of South America. The Vega launcher, primarily developed and built in Italy, will head north over the Atlantic Ocean to deliver the Falcon Eye 1 imaging satellite into a sun-synchronous orbit flying from pole-to-pole.

It will be the 15th flight of a Vega rocket, and the second Vega mission of 2019.

T+00:00:00 – Liftoff

The Vega rocket's first stage P80 solid rocket motor ignites and powers the 98-foot-tall booster off the launch pad 0.3 seconds later. The P80 first stage motor generates a maximum of 683,000 pounds of thrust.
The Vega rocket’s first stage P80 solid rocket motor ignites and powers the 98-foot-tall booster off the launch pad 0.3 seconds later. The P80 first stage motor generates a maximum of 683,000 pounds of thrust.

T+00:00:31 – Mach 1

The Vega rocket's first stage P80 solid rocket motor ignites and powers the 98-foot-tall (30-meter) booster off the launch pad 0.3 seconds later. The P80 first stage motor generates a maximum of 683,000 pounds of thrust.
The Vega rocket surpasses the speed of sound as it soars on a northerly trajectory from French Guiana. The rocket will reach Max-Q, the point of maximum aerodynamic pressure, at T+plus 53 seconds.

T+00:01:54 – First stage separation

Having consumed its 194,000 pounds (88 metric tons) of solid propellant, the 9.8-foot-diameter (3-meter) P80 first stage motor is jettisoned at an altitude of about 33 miles (53 kilometers).
Having consumed its 194,000 pounds (88 metric tons) of solid propellant, the 9.8-foot-diameter (3-meter) P80 first stage motor is jettisoned at an altitude of about 33 miles (53 kilometers). The second stage Zefiro 23 motor will ignite a second later to begin its 103-second firing.

T+00:03:38 – Second stage separation

The Zefiro 23 motor burns out and jettisons.
The Zefiro 23 motor burns out and jettisons.

T+00:03:51 – Third stage ignition

Moving at a velocity of nearly 9,000 mph, or about 3.9 kilometers per second, the Vega rocket's Zefiro 9 motor ignites for the third stage burn.
Moving at a velocity of nearly 9,000 mph, or about 3.9 kilometers per second, the Vega rocket’s Zefiro 9 motor ignites for the third stage burn.

T+00:03:56 – Fairing separation

The Vega’s 8.5-foot-diameter (2.6-meter) payload fairing is released as the rocket ascends into space.

T+00:06:32 – Third stage separation

The Zefiro 9 third stage shuts down and separates, having accelerated the rocket to nearly orbital velocity.

T+00:08:28 – First AVUM ignition

The Vega rocket’s Attitude and Vernier Module, or fourth stage, ignites for the first time. The AVUM burns hydrazine fuel with an RD-843 engine provided by Yuzhnoye of Ukraine.

T+00:16:23 – AVUM first cutoff

The Vega’s AVUM fourth stage is turned off after an 7-minute, 55-second burn, beginning a nearly 39-minute coast until the engine is ignited again.

T+00:54:58 – Second AVUM ignition

The AVUM fires a second time for a 69-second burn to put the Falcon Eye 1 satellite into its targeted orbit.

T+00:56:07 – AVUM second cutoff

The AVUM engine shuts down after reaching a circular sun-synchronous orbit with an altitude of 379 miles (611 kilometers).

T+00:57:09 – Falcon Eye 1 separation

The UAE military’s Falcon Eye 1 observation satellite separates from the Vega’s AVUM upper stage.

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Follow Stephen Clark on Twitter: @StephenClark1.


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