NROL-71 - Delta IV-H [D-382] - Vandenberg SLC-6 - 19.01.2019, 19:10 UTC

Автор tnt22, 09.11.2018 19:12:23

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tnt22

Цитировать12/20/2018 00:14 Stephen Clark

T-minus 4 hours, 15 minutes and counting. A poll of the ULA team gave a unanimous "go" to resume the countdown and begin fueling the Delta 4-Heavy rocket with cryogenic liquid hydrogen and liquid oxygen propellants.

All systems are on track for liftoff of the Delta 4-Heavy rocket from Vandenberg Air Force Base, California, at 5:44 p.m. PST (8:44 p.m. EST; 0144 GMT).

tnt22

Цитировать1:37 p.m. PST (4:37 p.m. EST; 2137 UTC) – Chilldown begins

A "go" has been given to start the cold gas chilldown conditioning of the liquid hydrogen systems on the three common booster cores. This is the precursor step before filling the stages with propellant.

The three common booster cores will be loaded with 330,000 gallons of super-cold liquid hydrogen that is chilled to minus-423 degrees Fahrenheit. The liquid hydrogen, along with the liquid oxygen to be loaded shortly as well, will be consumed by the three RS-68A main engines during the first minutes of the launch to exit Earth's atmosphere.

The port and starboard boosters will fire at full throttle for nearly four minutes and then separate. The center booster burns at partial thrust for most of that time in a fuel-conservation mode until the outer cores jettison, then its RS-68A engine revs up to full throttle for another minute-and-a-half of propulsion before staging.

tnt22

Цитировать2:35 p.m. PST (5:35 p.m. EST; 2235 UTC)

T-minus 2 hours, 53 minutes and holding. Fueling operations are on hold while the team is troubleshooting a valve at the launch pad. A red team is being sent to Space Launch Complex 6 to manually close the valve.

tnt22

Цитировать2:45 p.m. PST (5:45 p.m. EST; 2245 UTC)

And the countdown clock has been restarted.

tnt22

Цитировать3:12 p.m. PST (6:12 p.m. EST; 2312 UTC) – 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.

tnt22

Цитировать12/20/2018 02:44 Stephen Clark

T-minus 1 hour, 55 minutes. At this point in the countdown, all three of the Delta 4-Heavy's Common Booster Cores are loaded with liquid hydrogen and liquid oxygen. Final topping and replenishment of the propellants will continue throughout the countdown until the final minutes before launch as the super-cold liquids boil off.

The countdown is ticking toward a planned built-in hold at T-minus 4 minutes.

us2-star

"В России надо жить долго.." (с)
"Вы рисуйте, вы рисуйте, вам зачтётся.." (с)

tnt22

Цитировать12/20/2018 03:14 Stephen Clark

90 minutes until launch. Here are some statistics on tonight's mission:
    [/li]
  • 382nd Delta rocket launch since 1960
  • 38th Delta 4 rocket mission since 2002
  • 11th Delta 4-Heavy configuration to fly
  • 58th, 59th and 60th main engine from RS-68 family launched
  • 16th, 17th and 18th RS-68A main engine flown
  • 8th Delta 4 rocket launch from Vandenberg Air Force Base
  • 3rd Delta 4-Heavy launch from Vandenberg Air Force Base
  • 12th classified Delta 4 for the National Reconnaissance Office
  • 132nd United Launch Alliance mission since the company's formation in 2006
  • 9th ULA launch this year
  • 4th launch of the Delta family in 2018
  • 3rd Delta 4 launch in 2018
  • 10th launch from Vandenberg Air Force Base in 2018

tnt22

Цитировать4:35 p.m. PST (7:35 p.m. EST; 2335 UTC)

Loading of the upper stage liquid hydrogen tank was just reported complete, giving us a 1.6-million-pound Delta IV Heavy rocket that is fueled for launch today.

tnt22

Цитировать12/20/2018 03:39 Stephen Clark

Testing of the Delta 4-Heavy's destruct system has been accomplished. The flight termination system would be used to destroy the rocket if it veered off course after liftoff.

tnt22

Цитировать4:50 p.m. PST (7:50 p.m. EST; 0050 UTC)

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 Heavy rocket nozzles to ensure proper gimbaling during the ascent.

tnt22

Цитировать4:55 p.m. PST (7:55 p.m. EST; 0055 UTC)

The standard post-fueling inspections of the rocket's outer thermal insulation is underway using launch pad cameras.

tnt22

ЦитироватьULA‏Подлинная учетная запись @ulalaunch 5 мин. назад

The launch time has been adjusted slightly to 5:49pm PST (8:49 p.m. EST; 0149 UTC) that takes into account the earlier brief hold in the countdown. #NROL71 #DeltaIVHeavy

tnt22

Цитировать12/20/2018 04:13 Stephen Clark

Tonight's launch will mark the 11th flight of a Delta 4-Heavy rocket, which stands 233 feet tall and measures 53 feet wide. It weighs around 1.6 million pounds fully fueled, and its three Aerojet Rocketdyne RS-68A main engines will generate 2.1 million pounds of thrust at launch.

The rocket will head away from Vandenberg on a south-southeast trajectory over the Pacific Ocean, roughly parallel to the coast of Southern California and Baja California.

The Delta 4-Heavy is made by combining three Delta 4 rocket cores together. The port and starboard boosters have shaped nose cones for better aerodynamic stability, and will jettison at T+plus 3 minutes, 56 seconds. Once the boosters are away, the center core's RS-68A engine will throttle up from a partial thrust mode to full thrust and fire until T+plus 5 minutes, 36 seconds.

The first stage core booster will separate at T+plus 5 minutes, 43 seconds, giving way to a second stage.

The second stage is powered by an RL10 engine, also built by Aerojet Rocketdyne, which will produce 24,750 pounds of thrust in the vacuum of space.

The RL10 engine will ignite at T+plus 5 minutes, 55 seconds, followed by jettison of the Delta 4's payload shroud at T+plus 6 minutes, 6 seconds.

At that point in the flight, United Launch Alliance will end its live coverage of the mission at the request of the National Reconnaissance Office, the customer on tonight's mission, due to the classified nature of the payload.

ULA and the NRO are expected to issue an update after declaring success on the launch.

tnt22

Цитировать12/20/2018 04:21 Stephen Clark

The launch team is continuing to discuss a technical concern that cropped up earlier in the countdown. We'll stand by for a decision from ULA on the impact of the issue on tonight's countdown.

tnt22

Цитировать12/20/2018 04:23 Stephen Clark

Pressurization of the Delta 4-Heavy's RS-68A main engine spin start system is reported complete at this time. And flight control preps are confirmed complete.

tnt22


tnt22

ЦитироватьULA‏Подлинная учетная запись @ulalaunch 17:40 - 19 дек. 2018 г.

Launch Alert: we have declared a scrub for today's launch of the #DeltaIVHeavy. We will set up for a 24 hour recycle and the next launch attempt will be 12/20 at 5:31pm PST.

tnt22

Цитировать12/20/2018 05:19 Stephen Clark

A look at the weather forecast for tomorrow's possible launch time of 5:31 p.m. PST (8:31 p.m. EST; 0131 GMT) shows an 80 percent probability of acceptable conditions for a Delta 4 launch.

Winds will be from the northwest at 12 to 18 knots, with the possibility of a few low clouds at 200 feet, and high-level cirrus clouds. The main weather concern is with ground winds.

tnt22

https://tass.ru/kosmos/5934097
Цитировать20 ДЕК, 04:54
В США запуск ракеты Delta IV с разведывательным спутником отложен на сутки

Операция была отменена примерно за три минуты до запуска

НЬЮ-ЙОРК, 20 декабря. /ТАСС/. Запуск тяжелой ракеты- носителя Delta IV Heavy с секретным спутником Национального управления военно-космической разведки (НУВКР) США, запланированный на среду, перенесен на сутки. Об этом сообщила американская компания United Launch Alliance (ULA).

Старт должен был состояться в 17:49 по времени Западного побережья США (04:49 четверга по мск). Операция была отменена примерно за три минуты до запуска, по какой причине, пока не разъясняется. Ранее это уже неоднократно происходило, в последний раз - 18 декабря из-за неблагоприятных погодных условий. 8 декабря отсчет был прерван за 7,5 секунды до старта.

В ULA намерены предпринять новую попытку запуска в четверг. Стартовое окно откроется в 17:31 по времени Западного побережья США (04:31 пятницы по мск).
Спойлер
Деятельность НУВКР, контролирующего разведывательные спутники США, строго засекречена. Официальной информации о предназначении спутника, который планируется запустить на орбиту, и о его стоимости нет. Название аппарата также не приводится. Официально миссия по выводу спутника на орбиту обозначена кодом NROL-71.

ULA была основана в 2006 году. Ее штаб-квартира расположена в городе Сентенниал (штат Колорадо). Компания является совместным предприятием американских авиационных корпораций Boeing и Lockheed Martin.
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