JPSS-1 (NOAA-20) – Delta II 7920-10C – Vandenberg SLC-2W – 18.11.2017

[tnt22]

Delta II 7920-10C - JPSS-1 - Rollout - Credit: HeloDriver

Jay DeShetler

Опубликовано: 13 нояб. 2017 г.

Delta II 7920-10C - JPSS-1 - November 14, 2017 - Vandenberg Air Force Base

(0:14)

[tnt22]

Tory Bruno‏Подлинная учетная запись @torybruno 4 мин. назад

Preparations are running smoothly. Board is green, except for the Range. Ground winds. Think still thoughts. #JPSS1

[tnt22]

Spaceflight Now‏ @SpaceflightNow 47 сек. назад

The Delta 2 rocket's first stage is now filled with refined RP-1 kerosene ahead of a planned liftoff from California's Central Coast at 1:47am PST (4:47am EST; 0947 GMT). Live coverage: https://spaceflightnow.com/2017/11/13/delta-2-jpss-1-mission-status-center/ ...

[tnt22]

Spaceflight101 LIVE‏ @S101_Live 55 сек. назад

Riding shotgun with #JPSS1 are five CubeSats - two 3U CubeSats with their own deployers and three 1U satellites sharing a deployer. They will be released into a different orbit than JPSS-1 after an additional burn by the #DeltaII upper stage.

[tnt22]

:!:  

NASA_LSP‏Подлинная учетная запись @NASA_LSP 1 мин. назад

There are not any Collision Avoidance or COLA closures for the #JPSS1 launch today. #DeltaII @ULALaunch @30thSpaceWing New T-0: 4:47:35 EST, 1:47:35 PST.

[tnt22]

NASA_LSP‏Подлинная учетная запись @NASA_LSP 17 сек. назад

.@30thSpaceWing Launch Weather Officer (LWO) reported 30% probability of violation. Currently GREEN but monitoring ground winds #JPSS1 #DeltaII

[tnt22]

Spaceflight101 LIVE‏ @S101_Live 2 мин. назад

L-2 Hours: Today's #DeltaII launch window has been condensed to an instantaneous opportunity at 9:47:35 UTC after clean collision avoidance assessments.

[tnt22]

11/14/2017 10:47

The current weather conditions at Space Launch Complex 2-West are observed "green." There remains a 30 percent chance the gusty northwesterly ground winds could exceed launch constraints later in the countdown.

The outlook for launch time calls for a few clouds, northwest winds gusting up to 23 knots, and a temperature in the low 50s Fahrenheit.

[tnt22]

11/14/2017 10:51

Activation of the Delta 2's guidance system is complete.

[tnt22]

ULA‏Подлинная учетная запись @ulalaunch 2 мин. назад

The official "go" has been given to start Delta II first stage liquid oxygen loading right on time today.

[tnt22]

11/14/2017 11:05

The Delta 2's first stage is now being loaded with cryogenic liquid oxygen chilled to minus 298 degrees Fahrenheit. The super-cold oxidizer is flowing from a 28,000-gallon storage tank at Space Launch Complex 2 into the Delta 2 rocket through plumbing at the base of the first stage.

The first stage's Aerojet Rocketdyne RS-27A main engine will consume the liquid oxygen with the RP-1 kerosene already pumped into the vehicle.

[tnt22]

https://spaceflightnow.com/2017/11/14/delta-2-launch-timeline-with-jpss-1/

Delta 2 launch timeline with JPSS 1
November 14, 2017 Stephen Clark

A Delta 2 rocket boosted by nine strap-on motors and two liquid-fueled stages will launch NOAA's JPSS 1 weather satellite into a 511-mile-high (822-kilometer) orbit following liftoff from Vandenberg Air Force Base, California.

Спойлер

It will take 57-and-a-half minutes to deliver the JPSS 1 satellite to orbit from liftoff until spacecraft separation.

Launch is set for 1:47:02 a.m. PST (4:47:02 a.m. EST; 0947:02 GMT) from Space Launch Complex 2-West at Vandenberg.

The command to start the Delta 2's first stage RS-27A main engine is set for T-minus 2.7 seconds. After passing a computer health check, the six of the Delta 2's nine strap-on solid rocket boosters will ignite to send the launcher south from Vandenberg, following an arcing trajectory over the Pacific Ocean bound for polar orbit.

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

The Delta 2 will surpass the speed of sound in 32 seconds and reach the phase of flight with maximum aerodynamic pressure at approximately T+plus 48 seconds. The six ground-lit boosters will burn for about 63 seconds, and three air-lit boosters will ignite around two seconds later to continue the climb into space.

The six burned-out motors will release in sets of three from the Delta 2 at about T+plus 1 minute, 26 seconds, jettisoning once the launcher is clear of offshore oil rigs. The other three boosters will consume their pre-packed solid propellants before separating to fall into the Pacific Ocean at T+plus 2 minutes, 12 seconds.

The Delta 2's main engine will continue firing until T+plus 4 minutes, 23 seconds. Seven seconds later, the rocket's first stage will detach, giving way to the upper stage's AJ10-118K engine to ignite at T+plus 4 minutes, 37 seconds.

Separation of the launcher's composite nose fairing is scheduled for T+plus 4 minutes, 41 seconds, once the Delta 2 is out of the lower atmosphere, exposing the JPSS 1 satellite to space for the first time.


Credit: ULA

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

After coasting over Antarctica, the AJ10-118K engine will reignite at T+plus 50 minutes, 50 seconds. The 24-second burn will circularize the upper stage's orbit at an altitude of approximately 511 miles (822 kilometers) and an inclination of 98.7 degrees for deployment of the JPSS 1 weather satellite at T+plus 57 minutes, 30 seconds.

A third upper stage maneuver at T+plus 1 hour, 15 minutes, will last for 10 seconds to fine-tune the orbit for release of five CubeSat secondary payloads sponsored by NASA and developed by universities and institutions in Arizona, Idaho, Massachusetts, Tennessee and Australia.

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

One more second stage firing will de-orbit the rocket to burn up in Earth's atmosphere.

[свернуть]

[tnt22]

Chris B - NSF‏ @NASASpaceflight 7 мин. назад

Cygnus still expected to arrive at the ISS three minutes after the Delta II launches. Tally Ho (tiny dot).

[tnt22]

ULA‏Подлинная учетная запись @ulalaunch 3 мин. назад

The Delta II rocket now stands fully fueled for its mission to launch the #JPSS1 polar-orbiting weather observatory.

[tnt22]

11/14/2017 11:33

The liquid oxygen tank on the Delta 2 rocket's first stage is now full. Liquid oxygen will continue flowing into the tank throughout the countdown to replace the super-cold oxidizer as it naturally boils away.

With the completion of liquid oxygen tanking, the Delta 2 rocket now stands fully fueled for launch with the JPSS 1 weather satellite at 1:47:35 a.m. PST (4:47:35 a.m. EST; 0947:35 GMT) from Vandenberg Air Force Base, California. RP-1 fuel was loaded into the first stage earlier in the countdown, and the second stage received its blend of Aerozine 50 and nitrogen tetroxide hypergolic propellants earlier in the launch campaign. The nine solid rocket boosters came with their propellants pre-packed.

[tnt22]

[ Chris B - NSF‏ @NASASpaceflight 3 мин. назад

Old Vandenberg Structure. New Vandenberg rocket. Delta II is such a good looking LV. She's launched so many historic missions. She has totally earned her honored place in Sto-vo-kor.

[tnt22]

11/14/2017 11:48

One hour until launch. No problems are being discussed by the ULA launch team at this time. Here are some statistics on today's launch:

[/li]
• 378th Delta rocket launch since 1960
• 236th Delta launch with NASA involvement
• 154th Delta 2 rocket mission since 1989
• 29th Delta 2 to fly in the 7920 configuration
• 53rd Delta 2 mission overseen by NASA
• 44th Delta 2 rocket launch from Vandenberg Air Force Base
• 2nd launch of the Delta family in 2017
• 8th United Launch Alliance flight this year
• 123rd ULA launch overall
• 8th launch from Vandenberg Air Force Base in 2017
  

[tnt22]

ULA‏Подлинная учетная запись @ulalaunch 9 мин. назад

Today's #DeltaII is flying for the 29th time in the 7920 configuration with two stages, nine strap-on solid rocket motors and a 10-foot-diameter composite payload fairing.

[tnt22]

ULA‏Подлинная учетная запись @ulalaunch 1 мин. назад

The launch team is beginning "slew" or steering checks of the first and second stage engine nozzles.

[tnt22]

11/14/2017 12:00

The first and second stage steering checks have been accomplished. The launch team is now verifying good telemetry and data links with the Delta 2 rocket.