Delta 2 launch timeline with JPSS 1 – Spaceflight Now


A Delta 2 rocket boosted by 9 strap-on motors and two liquid-fueled levels will launch NOAA’s JPSS 1 climate satellite tv for pc right into a 511-mile-high (822-kilometer) orbit following liftoff from Vandenberg Air Force Base, California.

It will take 57-and-a-half minutes to ship the JPSS 1 satellite tv for pc to orbit from liftoff till spacecraft separation.

Launch is about for a 66-second window opening at 1:47:02 a.m. PST (four:47:02 a.m. EST; 0947:02 GMT) Tuesday from Space Launch Complex 2-West at Vandenberg.

The command to begin the Delta 2’s first stage RS-27A important engine is about for T-minus 2.7 seconds. After pbading a pc well being verify, six of the Delta 2’s 9 strap-on strong rocket boosters will ignite to ship the launcher south from Vandenberg, following an arcing trajectory over the Pacific Ocean sure for polar orbit.

The RS-27A engine, manufactured by Aerojet Rocketdyne, will generate round 200,000 kilos of thrust at liftoff, consuming a mixture of RP-1 kerosene and liquid oxygen. Each 40-inch-diameter (1-meter) booster ramps as much as 145,000 kilos of thrust in vacuum.

The Delta 2 will surpbad the velocity of sound in 32 seconds and attain the section of flight with most aerodynamic stress at roughly T+plus 48 seconds. The six ground-lit boosters will burn for about 63 seconds, and three air-lit boosters will ignite round two seconds later to proceed the climb into area.

The six burned-out motors will launch in units of three from the Delta 2 at about T+plus 1 minute, 26 seconds, jettisoning as soon as the launcher is obvious of offshore oil rigs. The different three boosters will eat their pre-packed strong propellants earlier than separating to fall into the Pacific Ocean at T+plus 2 minutes, 12 seconds.

The Delta 2’s important engine will proceed firing till T+plus four minutes, 23 seconds. Seven seconds later, the rocket’s first stage will detach, giving method to the higher stage’s AJ10-118Ok engine to ignite at T+plus four minutes, 37 seconds.

Separation of the launcher’s composite nostril fairing is scheduled for T+plus four minutes, 41 seconds, as soon as the Delta 2 is out of the decrease environment, exposing the JPSS 1 satellite tv for pc to area for the primary time.

Credit: ULA

Burning a mix of Aerozine 50 and nitrogen tetroxide storable liquid propellants, the second stage engine will hearth till T+plus 10 minutes, 38 seconds, to put the JPSS 1 spacecraft in a preliminary egg-shaped elliptical orbit.

After coasting over Antarctica, the AJ10-118Ok engine will reignite at T+plus 50 minutes, 50 seconds. The 24-second burn will circularize the higher stage’s orbit at an altitude of roughly 511 miles (822 kilometers) and an inclination of 98.7 levels for deployment of the JPSS 1 climate satellite tv for pc at T+plus 57 minutes, 30 seconds.

A 3rd higher stage maneuver at T+plus 1 hour, 15 minutes, will final for 10 seconds to fine-tune the orbit for launch of 5 CubeSat secondary payloads sponsored by NASA and developed by universities and establishments in Arizona, Idaho, Mbadachusetts, Tennessee and Australia.

The CubeSats will come out of their launch containers starting at T+plus 1 hour, 21 minutes, 40 seconds.

One extra second stage firing will de-orbit the rocket to dissipate in Earth’s environment.

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Follow Stephen Clark on Twitter: @StephenClark1.

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