AEHF-5 - Atlas V 551 (AV-084) - CCAFS SLC-41 - 08.08.2019, 10:13 UTC

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tnt22

ЦитироватьAug 08, 2019 06:36
Power up complete

The Atlas-Centaur rocket has been powered up for its launch of AEHF-5.

The flight control operator in the Launch Control Center performed the power up. Soon, he will begin avionics testing while the rocket's Inertial Guidance and Control Assembly (INCA) flight computer is allowed to warm up. Later, the operator will conduce guidance system testing and steering checks of the engine nozzles prior to cryogenic fueling.

The countdown continues to track on schedule for liftoff at 5:44 a.m. EDT (0944 UTC). At T-minus 5 hours 38 minutes (L-6 hours, 8 minutes) and counting, this is Atlas Launch Control.

tnt22

https://spaceflightnow.com/2019/08/07/photos-atlas-5-rocket-rolls-out-to-launch-pad-41/
ЦитироватьPhotos: Atlas 5 rocket rolls out to launch pad 41
August 7, 2019 | Stephen Clark


Credit: United Launch Alliance

Set to fly in its most powerful configuration with five solid rocket boosters, a United Launch Alliance Atlas 5 rocket rolled out to Cape Canaveral's Complex 41 launch pad Tuesday in preparation for a planned blastoff two days later with a U.S. military communications satellite.

The rollout two days before launch began around 9:30 a.m. EDT (1330 GMT) Tuesday. Less than an hour later, the Atlas 5 rocket was in the starting blocks at pad 41 after a 1,800-foot (550-meter) journey from ULA's nearby Vertical Integration Facility.
Спойлер
The Air Force's fifth Advanced Extremely High Frequency, or AEHF, communications satellite is fastened on top of the Atlas 5 rocket, inside a 17.7-foot-wide (5.4-meter) nose fairing. Built by Lockheed Martin with a Northrop Grumman-made nuclear-hardened secure communications payload, the AEHF 5 satellite will enable video, voice and data links between government leaders and military commanders.

The AEHF 5 spacecraft joins four previous AEHF satellites launched on Atlas 5 rockets in 2010, 2012, 2013 and 2018.

The 197-foot-tall (60-meter) Atlas 5 rocket is set for liftoff in a two-hour window opening at 5:44 a.m. EDT (0944 GMT) Thursday.

More photos of the Atlas 5's rollout are posted below. See our Mission Status Center for live coverage of the countdown and launch.


Credit: United Launch Alliance


Credit: United Launch Alliance


Credit: United Launch Alliance


Credit: United Launch Alliance


Credit: United Launch Alliance


Credit: United Launch Alliance


Credit: United Launch Alliance


Credit: United Launch Alliance


Credit: United Launch Alliance


Credit: United Launch Alliance


Credit: United Launch Alliance
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tnt22

ЦитироватьAug 08, 2019 07:21
Weather looking good

This is Atlas Launch Control at T-minus 4 hours, 53 minutes (L-5 hours, 23 minutes) and counting. Launch Weather Officer Jessica Williams from the Air Force's 45th Weather Squadron reports that conditions at Cape Canaveral are looking favorable for the flight of Atlas V and AEHF-5 today, forecasting an overall 80 percent chance of acceptable conditions.

The outlook calls for some scattered clouds, good visibility, southwesterly winds of 10 knots and a temperature near 78 degrees F.

The only slight concern will be anvil clouds causing a launch rule violation later in the two-hour launch window.

For the scheduled 5:44 a.m. EDT launch time, Williams said the weather odds are 90 percent or better.

zandr

https://news.liga.net/world/video/dlya-armii-ssha-zapuskayut-v-kosmos-sputnik-za-11-mlrd-translyatsiya
ЦитироватьДля армии США запускают в космос AEHF-5 за $1,1 млрд: трансляция
Связь, которую обеспечивают спутники серии AEHF, среди прочего используется военно-политическим руководством США для общения с войсками по всему миру
Сегодня, 8 августа в 12:44 дня по киевскому времени, со стартовой площадки SLC-41 базы ВВС США на мысе Канаверал планируется запуск ракеты Atlas V: она должна вывести на орбиту дорогостоящий военный спутник связи AEHF-5.
Стартовое окно — два часа.
В штате Флорида в это время будет ранее утро, зрелище при условии хорошей погоды должно быть ярким.
Открыть в новом окне подробный таймлайн/инфографику этой миссии.
Спутник
Созвездие спутников AEHF (Advanced Extremely High Frequency) призвано обеспечить защищенной по военному стандарту связью войска США, Британии, Канады и Нидерландов. Система будет считаться завершенной, когда в космосе одновременно окажется шесть таких аппаратов: тогда сигналами будет покрыт пояс планеты между 65-ми параллелями северной и южной широты.
AEHF на платформе A2100M обратно совместимы и постепенно заменят в космосе устаревшие аппараты Milstar. Данные они будут передавать на миллиметровых волнах частотой 44 ГГц, а получать — на сантиметровых (20 ГГц).
Инженеры утверждают, что AEHF — высокоскоростная и резистентная к взлому и глушению система.
Спутники разработаны и создаются компанией американского ОПК Lockheed Martin. Годы запуска четырех аппаратов — 2010, 2012, 2013 и 2018-й. Шестой и последний планируется к запуску в 2020 году.
AEHF-5 стартовым весом 6168 кг и стоимостью около $1,1 млрд в момент отделения от разгонного блока будет вращаться по орбите с такими параметрами: апогей — 35 299 км, перигей — 14 435 км, наклонение — 9,95 градусов, аргумент перигея — 180 градусов.

Чтобы добраться до пункта назначения около Земли (примерно 100 суток), а также для корректировки траектории во время работы, на AEHF установлен японский гидразиновый двигатель BT-4 и четыре американских ионных двигателя XR-5, которые функционируют на эффекте Холла. К моменту, когда спутник достигнет плановой позиции, он "похудеет" до 4080 кг.
Аппарат выйдет на геосинхронную орбиту (период обращения равен периоду вращения Земли, то есть около 24 ч), где должен будет оставаться не менее 14 лет. Работу его систем обеспечат две пятисегментные солнечные панели, которые суммарно могут запитать 14 среднестатических американских домовладений.
Смотрите видео: У возвращаемых ракет SpaceX появится мини-конкурент
United Launch Alliance также объявила, что перед отсоединением в космосе AEHF-5 будет осуществлено отделение экспериментального кубсата формата 12U, который используют для проверки технологий отслеживания орбитального мусора. Этот кубсат закрепят на второй ступени Centaur следующим образом.
"Ракета"
Atlas V — одноразовая двухступенчатая ракета. Сначала производилась Lockheed Martin, сейчас — в Денвере, штат Колорадо, альянсом ULA (Lockheed Martin + Boeing). Конфигурируемый носитель в части габаритов головного обтекателя и числа "боковушек". Стоимость запуска — от $110 до $235 млн. Это одна из самых надежных ракет: неудачных запусков не было.
Длина — 58,3 м, диаметр — 3,81 м, стартовая масса — от 334 до 547 тонн. Способна выводить на НОО до 18,8 т, на ГПО — почти 9 т.
Это будет 10-й запуск Atlas V в ее самой тяжелой конфигурации — 551, и 80-й юбилейный старт за историю носителя в целом. Номер конфигурации обозначает основные характеристики этой ракеты. Первая цифра - диаметр головного обтекателя: "5" — 5,4 м. Вторая цифра соответствует количеству боковых ускорителей — от 0 до 5, третья — число двигателей второй ступени: 1 или 2.
Маршевая ступень ракеты содержит двигатель РД-180 российского Энергомаша: он работает на керосине с жидким кислородом. Америка откажется от РД-180 в 2022 году.
Твердотопливные бустеры Aerojet по бокам от ступени выгорают за 1,5 минуты, после чего отделяются и падают в океан. Вторая ступень Centaur использует тягу двигателя RL-10C-1 на жидких водороде и кислороде.
Фото сборки ракеты, спутника, "Атласа-5" на стартовом столе и прочие кадры можно скачать в наивысшем качестве здесь. Все подробности об этой миссии доступны здесь в формате PDF.
Весной 2019-го в США испытали собственные двигатели для ракет, в том числе Atlas 5.
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tnt22

Цитировать ULA ‏Подлинная учетная запись @ulalaunch 2 мин. назад
Checks are being performed of the GPS Metric Tracking system, which uses the orbiting Global Positioning System to follow the #AtlasV rocket's flight downrange with position, velocity and timing information. http://bit.ly/av_aehf5


tnt22

https://spaceflightnow.com/2019/08/07/photos-aehf-5-satellite-encapsulated-for-launch/
ЦитироватьPhotos: AEHF 5 satellite encapsulated for launch
August 7, 2019 Stephen Clark

The U.S. Air Force's fifth Advanced Extremely High Frequency satellite, designed for secure, jam-resistant communications, is set for launch aboard a United Launch Alliance Atlas 5 rocket. These photos show the AEHF 5 satellite during encapsulation inside the Atlas 5's payload shroud.
Спойлер
The AEHF 5 satellite, built by Lockheed Martin, will join four other satellites in the Air Force's protecting communications network providing secure data, voice and video links to the military and government leaders.

The spacecraft weighs around 13,600 pounds (6,168 kilograms) fully fueled. The Atlas 5 rocket set to launch with the AEHF 5 satellite will fly in the "551" configuration — the most powerful Atlas 5 variant — with a 5.4 meter (17.7-foot) diameter payload fairing produced by Ruag Space and five solid rocket boosters from Aerojet Rocketdyne.

See our Mission Status Center for coverage of the countdown and launch.


The AEHF 5 communications satellite was encapsulated inside the Atlas 5 rocket's payload fairing in early June at the Astrotech payload processing facility in Titusville, Florida. Credit: Lockheed Martin


The AEHF 5 communications satellite was encapsulated inside the Atlas 5 rocket's payload fairing in early June at the Astrotech payload processing facility in Titusville, Florida. Credit: Lockheed Martin


The AEHF 5 communications satellite was encapsulated inside the Atlas 5 rocket's payload fairing in early June at the Astrotech payload processing facility in Titusville, Florida. Credit: Lockheed Martin


The AEHF 5 communications satellite was encapsulated inside the Atlas 5 rocket's payload fairing in early June at the Astrotech payload processing facility in Titusville, Florida. Credit: Lockheed Martin


The AEHF 5 communications satellite was encapsulated inside the Atlas 5 rocket's payload fairing in early June at the Astrotech payload processing facility in Titusville, Florida. Credit: Lockheed Martin


The AEHF 5 communications satellite was encapsulated inside the Atlas 5 rocket's payload fairing in early June at the Astrotech payload processing facility in Titusville, Florida. Credit: Lockheed Martin
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tnt22

ЦитироватьAug 08, 2019 09:37

Internal battery checks are complete.

tnt22

Цитировать08/08/2019 09:44 Stephen Clark

T-minus 2 hours, 30 minutes and counting. The Atlas 5 countdown is ticking toward a 15-minute built-in hold at T-minus 2 hours, when teams will give the "go" to begin cryogenic tanking.

tnt22

Цитировать ULA ‏Подлинная учетная запись @ulalaunch 1 мин. назад
In the latest launch weather briefing, @45thspacewing meteorologists forecast has improved to 90% chance of favorable conditions for liftoff from Cape Canaveral this morning.


tnt22

ЦитироватьAug 08, 2019 10:04
No COLAs

Safety officials have confirmed that there are no Collision Avoidance (COLA) periods during today's 120-minute launch window. 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 Atlas V and AEHF-5.

tnt22

ЦитироватьAug 08, 2019 10:05

This is Atlas Launch Control at T-minus 2 hours, 9 minutes (L-2 hours, 39 minutes) and counting. The initiation of gaseous nitrogen flow to the launch vehicle has started. This changes the environmental control system to supply nitrogen gas rather than conditioned air to the internal compartments of the Atlas first stage, Centaur upper stage and the payload fairing in preparation for fueling and launch.

tnt22

ЦитироватьAug 08, 2019 10:14
Countdown holding

This is Atlas Launch Control at T-minus 2 hours and holding. The countdown has entered the first of two planned, built-in holds that are scheduled in today's timeline. These are 15-minute blocks of time that gives the countdown some margin to resolve issues or catch up work that could be running late. This particular hold provides an opportunity to ensure all is ready before fueling operations begin. The final hold occurs at T-minus 4 minutes.

tnt22

ЦитироватьAug 08, 2019 10:15

The launch pad crew has completed its hands-on work to ready Space Launch Complex-41 for today's mission, and Launch Conductor Scott Barney has given the instruction for personnel to depart the site in advance of fueling operations.

tnt22

ЦитироватьAug 08, 2019 10:23

The Atlas V rocket will be loaded with approximately 66,000 gallons of liquid oxygen and liquid hydrogen over the next hour or so.

The first stage was loaded with 25,000 gallons of RP-1 kerosene after rollout on Tuesday.

The first stage will propel the AEHF-5 spacecraft out of Earth's atmosphere and the Centaur will execute three sequential burns over a five-hour period today to put the satellite into the most optimum orbit possible.


tnt22

ЦитироватьAug 08, 2019 10:29
Countdown resumes

This is Atlas Launch Control at T-minus 2 hours (L-2 hours, 15 minutes) and counting. The next phase of today's launch countdown has been initiated on schedule as we continue to target 5:44 a.m. EDT (0944 UTC) for liftoff of the United Launch Alliance Atlas V rocket carrying the AEHF-5 communications spacecraft for the Air Force.

Preparatory steps for fueling are being kicked off, including ground chilldown of the Atlas first liquid oxygen system and chilldown of the transfer lines to the Centaur upper stage liquid oxygen system.

tnt22

https://spaceflightnow.com/2019/08/08/atlas-5-launch-timeline-on-the-aehf-5-mission/
ЦитироватьAtlas 5 launch timeline on the AEHF 5 mission
August 8, 2019Stephen Clark

A United Launch Atlas 5 rocket is set to launch the U.S. Air Force's fifth Advanced Extremely High Frequency communications satellite from Cape Canaveral. This timeline shows the major mission events planned over a nearly six-hour flight to an optimized geostationary transfer orbit.[
The 197-foot-tall (60-meter) rocket, propelled by an RD-180 main engine and five solid rocket boosters, is set for liftoff during a two-hour launch window Thursday, Aug. 8, that opens at 5:44 a.m. EDT (0944 GMT).

The AEHF 5 mission will be the 80th flight of an Atlas 5 rocket, and the first Atlas 5 launch of 2019.

Built by Lockheed Martin, the AEHF 5 satellite joins four previous satellites in the AEHF constellation launched by Atlas 5 rockets in 2010, 2012, 2013 and 2018. The first four AEHF satellites in orbit allowed the Air Force's new generation of secure, nuclear-hardened voice, video and data relay spacecraft to span the globe, and the addition of a fifth AEHF geostationary relay satellite will grow the network's capacity and resiliency.

The Atlas 5 launch sequence will last 5 hours, 40 minutes, from liftoff until deployment of the AEHF 5 spacecraft. On this mission, ULA added extra hardware and maneuvering fuel to the Centaur upper stage, enabling the launcher to deliver the AEHF 5 satellites closer to its final orbit more than 22,000 miles (nearly 36,000 kilometers) above the equator.

"We're launching with the Centaur geosynchronous orbit kit," said Col. Shane Clark, AEHF 5 mission director from the Launch Enterprise Systems Directorate at the Air Force's Space and Missile Systems Center. "The GSO kit enables an orbital insertion much closer to the final orbit than a traditional geosynchronous transfer orbit, maximizing on-orbit capability of the AEHF 5 space vehicle."

The extra performance provided by the GSO kit will allow the Centaur upper stage to coast an additional two hours before its third firing. Spacecraft separation is scheduled for T+plus 5 hours, 40 minutes, more than two hours later than the time of deployment on the most recent Atlas 5 launch with an AEHF satellite.

Thanks to the mission profile change, the AEHF 5 satellite will separate in an orbit with a perigee, or low point, several thousand miles higher than achieved on the AEHF 4 launch last October. That means AEHF 5 will need to consume less of its own finite propellant supply to circularize its orbit, leading to a longer operating lifetime for the mission.

According to an Atlas 5 user's guide published by ULA, the GSO kit includes additional battery power, a full load of hydrazine to control the upper stage's orientation in space, and additional shielding over sensitive components, including the Centaur' hydrogen and oxygen tanks.

An overview of the Atlas 5/AEHF 5 launch sequence and a ground track map illustrating the rocket's path after liftoff are are posted below.


Credit: United Launch Alliance

T+0:00:01.1: Liftoff


After igniting its RD-180 main engine at T-minus 2.7 seconds, the Atlas 5 rocket fires its five solid rocket boosters and rises away from Complex 41 at Cape Canaveral Air Force Station, Florida, with approximately 2.6 million pounds of thrust.

T+0:00:34.4: Mach 1


The Atlas 5 rocket exceeds the speed of sound, flying east from Cape Canaveral Air Force Station.T+0:00:46.2: Max-Q

The Atlas 5 rocket passes through the region of maximum dynamic pressure during ascent through the lower atmosphere.

T+0:01:45.8: Jettison SRBs

Having burned out of propellant approximately 15 seconds earlier, the five spent Aerojet Rocketdyne-built solid rocket boosters are jettisoned once dynamic pressure conditions are satisfied.

T+0:03:23.3: Payload Fairing Jettison


The Atlas 5 rocket's payload fairing, made in Switzerland by Ruag Space, is jettisoned in a clamshell-like fashion once external heating levels drop below predetermined limits after climbing through the dense lower atmosphere. The Forward Load Reactor deck that connected the payload fairing's structure to the Centaur upper stage is released five seconds after the shroud's jettison.

T+0:04:26.2: Main Engine Cutoff


The RD-180 main engine completes its firing after consuming its kerosene and liquid oxygen fuel supply in the Atlas first stage.

T+0:04:32.2: Stage Separation


The Common Core Booster first stage of the Atlas 5 rocket separates from the Centaur upper stage. Over the next few seconds, the Centaur engine liquid hydrogen and liquid oxygen systems are readied for ignition.

T+0:04:42.2: Centaur Ignition 1

The Centaur RL10C-1 engine ignites for the first of three upper stage firings. This burn will inject the Centaur stage and the AEHF 5 satellite into an initial parking orbit.
T+0:11:41.5: Centaur Cutoff 1


The Centaur engine shuts down after arriving in a planned low-Earth parking orbit. The vehicle enters an 11-minute coast period before arriving at the required location in space for the second burn.

T+0:22:49.9: Centaur Ignition 2


Producing 22,900 pounds of thrust, the Centaur re-ignites to accelerate the AEHF 5 payload into a highly elliptical transfer orbit from the parking altitude achieved earlier in the launch sequence. This burn lasts more than six minutes.

T+0:28:53.3: Centaur Cutoff 2


The second Centaur firing places the AEHF 5 satellite into an elliptical transfer orbit stretching more than 20,000 miles above Earth, beginning a five-hour coast period for the mission's final orbital adjustment maneuver. A secondary U.S. Air Force smallsat payload named TDO will separate from the Centaur upper stage's aft bulkhead around 30 seconds after the RL10 engine shuts down. The TDO mission will help the Air Force evaluate space debris.

T+5:36:00.0: Centaur Ignition 3


After a five-hour coast, the Centaur's RL10 engine reignites for a roughly one-minute, 46-second firing to place the AEHF 5 satellite in the proper orbit for spacecraft separation.

T+5:37:46.6: Centaur Cutoff 3


The powered phase of flight is concluded as the Centaur reaches the planned elliptical geostationary transfer orbit with an apogee, or high point, of 21,933 miles (35,298 kilometers), a perigee, or low point, of 8,969 miles (14,435 kilometers), and an inclination of 9.95 degrees.

T+5:40:35.7: AEHF 5 Separation


The AEHF 5 spacecraft deploys from the Centaur upper stage.



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tnt22

ЦитироватьAug 08, 2019 10:39

Centaur LO2 loading begins

With the thermal conditioning, or chilldown, now complete, liquid oxygen has started to flow into the Centaur upper stage for today's launch. About 4,150 gallons of liquid oxygen will be loaded into Centaur for its three-burn mission to boost the AEHF-5 satellite into an optimized geosynchronous transfer orbit.

tnt22

ЦитироватьAug 08, 2019 11:00
Atlas LO2 loading begins

Filling of the Atlas V rocket's largest tank has begun. About 48,800 gallons of super-cold oxidizer for the main engine is flowing into the liquid oxygen tank on common core booster first stage

tnt22

ЦитироватьAug 08, 2019 11:06

The Centaur liquid oxygen tank is topping to flight level. Meanwhile, first stage liquid oxygen loading is transitioning from slow-fill to fast-fill mode.

tnt22

ЦитироватьAug 08, 2019 11:24
Centaur LH2 loading begins

The launch team has received the "go" to begin filling the Centaur upper stage with the super-cold liquid hydrogen fuel following chilldown of the system. The Centaur holds about 12,300 gallons of the cryogenic propellant for its three engine burns during this launch.