GPS III SV02 "Magellan" - Delta-IV-M+(4,2) [D-384] - CCAFS, SLC-37B - 22.07.2019, 13:06 UTC

Автор tnt22, 25.03.2019 21:58:33

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tnt22

ЦитироватьAug 22 13:49
We have finished the "fast-fill" loading mode for the common booster core's liquid hydrogen tank, and the post-fueling checks and valve tests are underway before topping commences.

tnt22

Цитировать Julia‏ @julia_bergeron 11 мин.назад

I made a special delivery to the DOC last night but was delayed by something that stopped me in my tracks. Moon rising over LC-37 where #GPSIIISV02 was beginning the countdown to launch.


tnt22

ЦитироватьAug 22 13:52
DCSS LOX loading begins

Chilldown of the second stage liquid oxygen system is complete, and the vehicle is ready to begin receiving 4,500 gallons of LOX for launch. This is the last of the rocket's cryogenic tanks to be filled in today's countdown.

tnt22


tnt22

ЦитироватьAug 22 14:04
New launch time

Safety officials have confirmed that there is one momentary Collision Avoidance (COLA) period during today's launch window. That COLA conjunction prohibits liftoff at the very opening of the window. So the target liftoff time has been shifted to 9:01:00 a.m. EDT (1301 UTC).

COLAs are brief moments in time when the launch is not allowed to occur because the trajectory would pass too close to another object already in space. This analysis is based on a screening of known active and debris objects in orbit that could cause a conjunction with the ascending Delta IV and GPS III SV02.

tnt22

ЦитироватьAug 22 14:07
A hydrogen leak has been detected by the HazGas system around a quick-disconnect fitting on the second stage liquid hydrogen vent.

tnt22

Цитировать ULA‏ Подлинная учетная запись @ulalaunch 2 мин. назад

Safety officials have confirmed that there is one momentary Collision Avoidance (COLA) period during today's launch window. That COLA conjunction prohibits liftoff at the very opening of the window. So the target liftoff time has been shifted to 9:01:00 a.m. EDT (1301 UTC).

tnt22

ЦитироватьAug 22 14:08
Engineers are reviewing data on this leak indication to determine a recommendation.

tnt22

https://spaceflightnow.com/2019/08/22/delta-4-rockets-launch-timeline-with-gps-3-sv02/

ЦитироватьDelta 4 rocket's launch timeline with GPS 3 SV02
August 22, 2019 | Stephen Clark

A United Launch Alliance Delta 4 rocket will deliver the U.S. Air Force's second GPS 3-series navigation satellite into an elliptical transfer orbit nearly two hours after liftoff from Cape Canaveral.
Liftoff is scheduled during a launch window opening at 9:00:30 a.m. EDT (1300:30 GMT) Thursday. The window extends to 9:27 a.m. EDT (1327 GMT).

T+00:00:00 — Liftoff


The United Launch Alliance Delta 4 rocket takes off powered by an Aerojet Rocketdyne RS-68A main engine and two solid rocket boosters built by Northrop Grumman Innovation Systems. The hydrogen-burning main engine ignites at T-minus 5 seconds, following by ignition of the two boosters at T-minus 0, the release of four hold-down bolts and retraction of the launch pad's three swing arms.

T+00:00:58.5 — Max-Q


Heading northeast from Cape Canaveral on an azimuth of roughly 60 degrees, the Delta 4 surpasses the speed of sound at T+plus 42 seconds, then experiences the most extreme aerodynamic pressures of the mission at T+plus 58.5 seconds.

T+00:01:40.0 — Solid Rocket Motor Separation


The Delta 4's two GEM-60 solid rocket boosters are jettisoned in two pairs around seven seconds after consuming all their propellant.

T+00:03:55.9 — Booster Engine Cutoff


The Delta 4's RS-68A main engine shuts down after burning its supply of super-cold liquid hydrogen and liquid oxygen.

T+00:04:02.4 — Stage Separation


The Delta 4's Common Booster Core separates from the rocket's second stage.

T+00:04:16.9 — First Second Stage Ignition


The Delta 4's second stage Aerojet Rocketdyne RL10B-2 engine ignites and powers up to 24,750 pounds of thrust in the first of its two firings to place the GPS 3 SV02 satellite into a MEO transfer orbit.

T+00:04:26.9 — Payload Fairing Jettison


The Delta 4's composite bisector fairing jettisons from the rocket once the launcher reaches a safe altitude above the dense lower layers of Earth's atmosphere.

T+00:13:33.1 — First Second Stage Engine Shutdown


The second stage's RL10B-2 engine shuts down after placing the GPS 3 SV02 satellite in a preliminary parking orbit, beginning a 53-minute coast before the engine reignites.

T+01:06:47.3 — Second Stage Engine Restart


The RL10B-2 second stage engine ignites again for a three-and-a-half-minute burn to send the GPS 3 SV02 spacecraft into a higher, elliptical transfer orbit.

T+01:10:14.6 — Second Stage Engine Shutdown


The Delta 4's second stage engine shuts down after placing the GPS 3 SV02 spacecraft in a transfer orbit ranging between 745 miles (1,200 kilometers) and 12,542 miles (20,185 kilometers) above Earth, with an orbital plane tilted 55 degrees to the equator.

T+01:55:26.6 — GPS 3 SV02 "Magellan" Separation


The Lockheed Martin-built GPS 3 SV02 spacecraft, nicknamed "Magellan," separates from the Delta 4's second stage.
[свернуть]

tnt22

ЦитироватьAug 22 14:14
Loading of the upper stage liquid hydrogen tank was just reported complete. Oxygen filling on the DCSS will finish fueling operations shortly.

tnt22

ЦитироватьAug 22 14:16
The Delta Cryogenic Second Stage has been loaded with its liquid oxygen supply. The propellant, along with liquid hydrogen fuel that has been filled, will be consumed by the stage's RL10B-2 engine.

tnt22

ЦитироватьAug 22 14:20
The Cumulus Cloud Rule has gone red. The expected clear time is 8:30 a.m. EDT (1230 UTC).

tnt22

ЦитироватьAug 22 14:36
The launch team is setting up for flight slews, the next major milestone in the countdown. This is the steering test patterns run on the Delta IV rocket nozzles to ensure proper gimbaling during the ascent.

tnt22

https://spaceflightnow.com/2019/08/22/delta-384-mission-status-center/
Цитировать08/22/2019 14:43 Stephen Clark

Testing of the Delta 4 rocket's flight termination system is complete. The flight termination system would be activated to destroy the rocket if it flew off course and threatened populated areas.

tnt22

ЦитироватьAug 22 14:46
The Delta Cryogenic Second Stage has been loaded with its liquid oxygen supply. LOX and LH2 will be consumed by the stage's RL10B-2 engine.

We have a 735,000-pound Delta IV rocket that is fueled for launch.

tnt22


tnt22

ЦитироватьAug 22 14:50
The team is preparing to run post-fueling checks on the second stage. The HazGas system will be used again to measure if there is an actual leak.

tnt22

ЦитироватьAug 22 14:54
All launch weather rules are GO again.

tnt22

Цитировать John Kraus  :f09f9a80:‏ @johnkrausphotos 3 мин. назад

The final Delta IV Medium rocket stands tall at SLC-37B, ready to launch the second GPS III satellite, dubbed "Magellan," at 9:01am EDT this morning.


tnt22

Цитировать AF SMC‏ @AF_SMC 8 мин. назад

GPS is a global utility, providing high-quality, precise positioning, navigation and timing for all users "Any Time, Any Place, Right Time, Right Place."


5 мин. назад

GPS III SV02, dubbed "Magellan" in honor of Ferdinand Magellan, Portuguese explorer who led the first expedition to circumnavigate the Earth, is ready for launch!


2 мин. назад

Magellan (GPS III SV02) is slated for D-Plane (Slot 3) joining the 31-operational satellite constellation providing global space-based positioning, navigation, and timing information.