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Home / Science / Delta 4-Heavy Start Schedule with Parker Solar Probe – Spaceflight Now

Delta 4-Heavy Start Schedule with Parker Solar Probe – Spaceflight Now



A United States Alliance Alliance delta 4-heavy launcher crowned with an upper-stage solid fuel motor will send the NASA Parker Solar Probe on a fast voyage through the inner solar system after launching from Cape Canaveral.

The 71 meter high launch vehicle is launched from Cape Canaveral's Complex 37B launch pad, powered by three Aerojet Rocketdyne RS-68A main engines.

The Delta 4-Heavy has flown nine times and is done with three modified first-stage Delta 4 cores bolted together. The entire cryogenic launcher burns a mixture of liquid hydrogen and liquid oxygen.

Parker Solar Probe's $ 1.5 billion mission will be the first spacecraft to travel in the solar corona, a flaming plasma zone a few million miles from us. One of the mission's goals is to help scientists find out how the solar wind is heated and accelerated into the solar system, affecting the planets, including our own.

The timeline below is a rough approximation of the timing of the main launch events for Delta 4 ̵

1; Heavy Start with Parker Solar Probe. The exact timing changes from day to day based on the start date in the interplanetary window of the mission, which ends on 23rd August.

Date Source: ULA

T + 00: 00:00 – Liftoff

The Delta 4-Heavy United Launch Alliance is powered by three Aerojet Rocketdyne RS-68A main engines. The hydrogen-burning power plants ignite in a staggered manner, igniting the Common Booster Core on the starboard side at T minus 7 seconds, followed by the port and midboosters at T minus 5 seconds.

T + 00: 03: 57.6 – Jettison Port and Starboard Booster

After consuming their liquid hydrogen and liquid fuel blends, the common booster cores on the port and starboard sides of the Delta 4-Heavy switch their RS-68A -Master engines off and off from the center core, which throttles them from a partial thrust setting to a full thrust mode after booster disconnection

T + 00: 05: 35.9 – Booster Engine Shutdown

The main RS-68A main engine of the Delta 4 terminates liquid hydrogen and liquid oxygen after burning off its supercalternate

T + 00: 05: 42,4 – First Stage Separation

The Common Booster Core of the Delta 4 separates from the second stage of the Rocket

T + 00 : 05: 55.4 – First Main Engine Launch

Delta 4 Aerojet Ro Stage 2 The cketdyne RL10B-2 engine fires up to 24,750 Pfu in the first of its two ignitions on the Parker Solar Probe mission and thrust.

T + 00: 06: 05.4 – Jettison payload fairing

The Delta 4 composite biscuit When the carrier reaches a safe height above the dense lower layers of the Earth's atmosphere, the jets are launched from the rocket.

T + 00: 10: 37.1 – First Main Shutdown

The second-stage RL10B-2 engine shuts off after parking Parker Solar Probe in a provisional orbit starting 12 minutes before engine start

T + 00:22:25,4 – Second Main Engine Start

The RL10B-2 second stage engine fires again to send Parker a sun probe on a trajectory to escape Earth's gravitational bond

T + 00: 36: 38.9 – Second Main Engine Shutdown

After more than 14 minutes of continuous combustion, the RL10B-2 second stage engine shuts off and stops its second-shot shoot on the Parker Solar Probe mission.

T + 0 0: 37: 09.0 – Secondary Stage Separation

The Star 48BV upper stage kick motor developed by Northrop Grumman Innovation Systems will be used from the second stage of the Delta 4 onwards.

T + 00: 37: 29.0 – Third Stage Ignition [19659028] The sturdy Star 48BV engine with control nozzles and a vectorable nozzle fires off the Earth at a higher speed for an 89 second combustion to accelerate the Parker Solar Probe to send. Ignition occurs as soon as the Star 48BV kick stage is at least 50 feet from the second stage of Delta 4.

T + 00: 38: 58.0 – Third Stage Burnout

The Star 48BV upper stage kicker engine burns out after that

T + 00: 43: 18.0 – Parker Solar Probe Separation

The 1,446 kilogram heavy NASA's Parker Solar Probe spacecraft moves from the Star 48BV kick stage toward a Venus flyby in October to approach the sun.

Follow Stephen Clark on Twitter: @ StephenClark1 .


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