Inmarsat-S–Europasat/Hellas-Sat 3 (HS3-IS), GSAT-17– Ariane 5 ECA (VA238)– Kourou ELA-3 – 28.06.2017

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ISRO выпустила брошюру к запуску GSAT-17

GSAT-17 Brochure.pdf - 3321555 B, 4  стр, 2017-06-27 11:21:50 UTC

 

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Massimiliano Ladovaz‏ @M_Ladovaz 3 ч. назад

#EANsat launcher rolling out

Video

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Stéphane Israël‏ @arianespaceceo 36 мин. назад

All is going according to plan: #Ariane5 has reached the launch zone for tomorrow's #VA238 launch for @HellasSat @InmarsatGlobal & @isro



Arianespace‏ @Arianespace 17 мин. назад

#Ariane5 is in the launch zone for its June 28 liftoff with Hellas Sat 3-Inmarsat S EAN and GSAT-17. Mission Update: http://bit.ly/2ti9cX7 

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http://www.arianespace.com/mission-update/va238-launch-vehicle-rollout/

Ariane 5 | June 27, 2017

Ariane 5 reaches the launch zone for Arianespace's June 28 liftoff

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The Ariane 5 for Arianespace Flight VA238 moves into position at the ELA-3 launch zone.

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Arianespace has delivered another Ariane 5 to the launch zone at Europe's Spaceport in French Guiana, clearing the way for tomorrow's heavy-lift mission with a pair of satellites: Hellas Sat 3-Inmarsat S EAN and GSAT-17.

Riding atop a mobile launch table, Ariane 5 today completed its transfer fr om the Spaceport's Final Assembly Building – wh ere payload integration occurred – to the dedicated ELA-3 launch complex. With this rollout completed, the final countdown will begin for a June 28 liftoff at the start of a 1-hr., 17-min. launch window opening at 5:59 p.m. local time in French Guiana.

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Tomorrow's mission is designated Flight VA238, and it has an estimated payload performance of 10,177 kg. – a total that factors in Hellas Sat 3-Inmarsat S EAN and GSAT-17, plus the dual-satellite dispenser system and integration hardware. Both passengers are to be deployed to geostationary transfer orbit during a 39-min. flight sequence.

Continuing the Arianespace launch tempo

Hellas Sat 3-Inmarsat S EAN is the mission's upper passenger and will be released first in the flight sequence at 28 min. after liftoff. Produced by Thales Alenia Space, it is a two-payload "condosat" to be operated by Hellas Sat and Inmarsat. Once in orbit, the Hellas Sat 3 component will deliver direct-to-home and telecom services to maintain and expand Hellas Sat's business reach; while the Inmarsat S EAN component provides the satellite portion of Inmarsat's new European Aviation Network.

GSAT-17, to be deployed from Ariane 5's lower passenger position, was built by the Indian Space Research Organisation (ISRO) to strengthen its current fleet of 17 telecommunications satellites. The spacecraft's separation will occur approximately 41 min. after liftoff.

As the fourth heavy-lift Ariane 5 flight so far in 2017, tomorrow's launch will continue a busy year of mission activity for Arianespace's full family of launchers, which also has included two flights performed with the medium-lift Soyuz and one using the lightweight Vega.

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• A larger version of the photo above is available for downloading in the Gallery.
  

Launch window for Flight VA238:

[TH]Kourou[/TH][TH]Universal Time (UTC)[/TH][TH]Washington, D.C.[/TH][TH]Paris[/TH]

Between 5:59 p.m. and  7:16 p.m. on June 28	Between 20:59 and  22:16 on June 28	Between 4:59 p.m. and  6:16 p.m. on June 28	Between 10:59 p.m. and  00:16 p.m. on June 28/29

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Massimiliano Ladovaz‏ @M_Ladovaz 4 ч назад

#EANsat on launch pad @InmarsatGlobal

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https://spaceflightnow.com/2017/06/27/ariane-5-rocket-scheduled-for-launch-wednesday-from-french-guiana/

Ariane 5 rocket scheduled for launch Wednesday fr om French Guiana
June 27, 2017 Stephen Clark

Arianespace's launch team in French Guiana rolled an Ariane 5 booster to its launch pad Tuesday and readied the rocket for liftoff Wednesday with an Inmarsat satellite to connect airline passengers over Europe and an Indian communications craft.

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The Ariane 5 rocket arrives at the ELA-3 launch pad Tuesday in French Guiana. Credit: ESA/CNES/Arianespace – Photo Optique Video du CSG – P. Baudon

Slated for its fourth launch of the year, the Ariane 5 is set to deploy a novel communications satellite with an Inmarsat S-band mobile broadband payload tailored for airborne customers and television broadcasting transponders for the Greek operator Hellas-Sat.

The so-called Hellas-Sat 3/Inmarsat S EAN satellite, built by Thales Alenia Space in France, will ride in the upper position inside the Ariane 5 rocket's Swiss-made payload fairing. Its co-passenger on Wednesday's launch is GSAT 17, an Indian communications and data relay spacecraft.

Ground teams at the European-run space base in Kourou, French Guiana, rolled the nearly 180-foot-tall (55-meter) Ariane 5 to its ELA-3 launch pad Tuesday morning. Mounted on a mobile launch platform, the rocket was towed along rail tracks for the 1.7-mile (2.7-kilometer) journey fr om the spaceport's final assembly building to the launch zone.

The European launcher arrived at the launch pad around midday, and crews spent the afternoon connecting the launch table to the pad's propellant, electrical and telemetry systems. The launch team also planned to fill the Ariane 5's high-pressure helium tank Tuesday.

The final countdown will commence at 0936 GMT (5:36 a.m. EDT) Wednesday, with clocks at the Guiana Space Center timed for a targeted liftoff at 2059 GMT (4:59 p.m. EDT; 5:59 p.m. French Guiana time). Wednesday's launch window extends until 2216 GMT (6:16 p.m. EDT; 7:16 p.m. French Guiana time).
Electrical systems checks on the Ariane 5 should begin at 1026 GMT (6:26 a.m. EDT).

Workers will also put finishing touches on the launch pad, including the closure of doors, removal of safety barriers and configuring fluid lines for fueling. The flight program for Wednesday's launch will be loaded into the rocket's computer.

The launch team will begin the process to fuel the rocket with super-cold liquid hydrogen and liquid oxygen propellants around 1621 GMT (12:21 p.m. EDT). First, ground reservoirs will be pressurized, then the fuel lines will be chilled down to condition the plumbing for the flow of super-cold liquid hydrogen and liquid oxygen, which are stored at approximately minus 423 degrees Fahrenheit and minus 298 degrees Fahrenheit, respectively.

It will take approximately two hours to fill the Ariane 5 core stage tanks.

A similar procedure for the Ariane 5's cryogenic upper stage will commence at 1741 GMT (1:41 p.m. EDT).

Chilldown conditioning of the Vulcain 2 first stage engine will occur at 1731 GMT (1:31 p.m. EDT), and a communications check between the rocket and ground telemetry, tracking and command systems is scheduled for 1944 GMT (3:44 p.m. EDT).

A final weather briefing will come at T-minus 10 minues, and then the computer-controlled synchronized countdown sequence will begin seven minutes before launch to pressurize propellant tanks, switch to on-board power and take the rocket's guidance system to flight mode.

The Vulcain 2 engine will ignite as the countdown clock reaches zero, followed by a health check and ignition of the Ariane 5's solid rocket boosters seven seconds later to send the 1.7 million-pound launcher skyward.

Five seconds after blastoff, the rocket will begin pitching east from the ELA-3 launch pad, surpassing the speed of sound less than a minute into the mission. The Ariane 5's twin solid rocket boosters will jettison 2 minutes, 19 seconds after liftoff.

Once above the dense atmosphere, the launcher's payload fairing will fall away at an altitude of more than 70 miles — about 112 kilometers. The Ariane 5's first stage will shut down 8 minutes, 52 seconds, after liftoff, followed moments later by stage separation and ignition of the hydrogen-fueled cryogenic HM7B upper stage engine.

The rocket's upper stage will fire more than 16 minutes, accelerating to a velocity of 21,000 mph, or more than 9.3 kilometers per second, to reach an orbit with a planned high point of 35,786 kilometers (22,236 miles), a targeted low point of 250 kilometers (155 miles) and an inclination of 3 degrees.

The release of the Hellas-Sat 3/Inmarsat S EAN is scheduled for 28 minutes, 17 seconds, after liftoff. The rocket's barrel-shaped Sylda 5 dual-payload adapter will be jettisoned a few minutes later.

GSAT 17 will separate from the lower portion of the payload stack at 41 minutes, 47 seconds.


The Hellas-Sat 3/Inmarsat S EAN spacecraft is pictured inside a clean room at the Guiana Space Center on June 7. Engineers wore special protective suits as they loaded toxic propellants into the satellite. Credit: ESA/CNES/Arianespace – Photo Optique Video du CSG – P. Baudon

Wednesday's mission will mark the 94th flight of an Ariane 5 rocket since it debuted in 1996. It will be the seventh Arianespace launch so far this year, divided among a roster of launchers that include the Ariane 5, the lightweight solid-fueled Vega, and commercial flights of the Russian Soyuz booster.

The two satellites carried into orbit by the Ariane 5 will maneuver in the coming days to their final orbits more than 22,000 miles (nearly 36,000 kilometers) over the equator. The spacecraft, using on-board thrusters, will circularize their orbits and extend their solar panels and antennas before entering service.
Hellas-Sat 3/Inmarsat S EAN is heading for a geostationary position at 39 degrees east longitude for a planned 17-year mission.

Developed in a cost-sharing "condosat" arrangement by Hellas-Sat and Inmarsat, the 12,742-pound (5,780-kilogram) satellite was originally contracted to launch on SpaceX's Falcon Heavy rocket in 2016. But delays in SpaceX's development of the heavy-lift launcher have pushed its maiden flight until at least late this year, prompting Inmarsat and Hellas-Sat in December to switch to an Ariane 5 launch.

"It's been a real win-win for Inmarsat and Hellas-sat to develop this project together," said Massimiliano Ladovaz, Inmarsat's vice president of space segment and system architecture. "The spacecraft that was manufactured by a very competent team at Thales Alenia Space in Cannes and Toulouse is a very good example of a 'condosat,' wh ere two payloads for two different customers share the same bus.

"We are extremely happy with the very fast integration cycle that allowed us to be ready to launch in such a fast turnaround," Ladovaz said, referring to the short time between the satellite's addition to the Ariane 5 manifest and Wednesday's scheduled launch. "All the work was done in less than seven months."

Inmarsat will use its S-band capacity on the spacecraft for WiFi services for airline passengers across Europe, with coverage in all 28 European Union member states, plus Norway and Switzerland. The company calls it the European Aviation Network.

The aeronautical communications project is a partnership between Inmarsat and Deutsche Telekom, which provides a network of approximately 300 4G ground sites, allowing a computerized controller aboard aircraft to automatically switch between ground and satellite WiFi service as needed.

"The S-band satellite is actually the first of its kind because it's going to be part of a hybrid integrated service, integrated meaning between space — a SATCOM component — and a terrestrial component," said Michele Franci, Inmarsat's chief technology officer. "It is going to be deployed over Europe, and it's going to provide, specifically, aero connectivity services for regional jets for airlines that work in Europe."

Coupling satellite- and ground-based broadband for airline passengers will help meet high demand over heavily-trafficked air routes near major European cities.

"If you go around the big hubs, like Frankfurt, London-Heathrow, or Paris, between 8 and 10 in the morning, or between 4 and 6 in the evening, you have very dense activity, so the amount of service that is required ... exceeds what you can do from one single satellite," Franci said in an interview with Spaceflight Now last month. "You would need a pretty expensive deployment. While the satellite allows you to go wide, and to cover areas wh ere service is patchy, by integrating these two (ground and satellite) capabilities, we expect to provide pretty high quality passenger connectivity."

Franci called the S-band aviation network "complementary" to Inmarsat's Global Xpress fleet, which beams broadband services to airplanes, ships and other on-the-go customers around the world. While Global Xpress is suited to remote regions, the European Aviation Network is designed to serve clients in congested parts of Europe.

The Hellas-Sat 3 portion of the spacecraft will replace coverage currently offered by the Hellas-Sat 2 satellite launched by an Atlas 5 rocket in May 2003. Hellas-Sat, a Greek subsidiary of Saudi Arabia's Arabsat, owns 44 Ku-band transponders and a single Ka-band transponder on the satellite.

Harry Iordanou, Hellas-Sat 3 project manager, said the satellite "will be Hellas-Sat's second satellite at 39 degrees east delivering in-orbit, direct-to-home, and telecom services over its coverage areas in Europe, the Middle East and sub-Saharan African countries.

"Its activation will not only maintain but also expand Hellas-Sat's business reach with additional capacity, while bringing video content in high and ultra-high definition format," Iordanou said.
The satellite's initial orbit-raising maneuvers and deployments will be controlled from Thales Alenia Space's center in Cannes, while in-orbit testing and commercial operations will be managed from a control site in Nemea, Greece.


The Ariane 5 rocket's payload fairing, containing the Hellas-Sat 3/Inmarsat S EAN satellite, is lowered over India's GSAT 17 communications spacecraft during final assembly of the launcher. Credit: ESA/CNES/Arianespace – Photo Optique Video du CSG – JM Guillon

The 7,665-pound (3,477-kilogram) GSAT 17 satellite also launching Wednesday is the heaviest Indian-built spacecraft ever built, according to Prakasha Rao, GSAT 17 launch campaign manager at the Indian Space Research Organization.

Outfitted with C-band broadcast transponders and an S-band payload designed for mobile services, GSAT 17 will join 17 current satellites in India's communications network. According to ISRO, GSAT 17 also hosts a payload to relay meteorological data and has a search and rescue support mission.

GSAT 17 is designed for a 15-year mission, and will enter service in geostationary orbit 93.5 degrees east longitude following several weeks of orbit-raising and checkouts.

The launch of GSAT 17 caps a busy June for ISRO after the successful inaugural orbital test flight of India's GSLV Mk.3 rocket June 5, the largest launcher in India's history, and the liftoff of 31 satellites on a Polar Satellite Launch Vehicle on June 23.

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DutchSpace‏ @DutchSpace 38 мин.38 назад

Numbers & Apogees for tonight's #Ariane5 #VA238 launch: launcher serial: L591 requested performance: 10135,5 kg HS3:5780kg GSAT17: 3476 kg

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https://spaceflightnow.com/2017/06/28/launch-timeline-for-ariane-5s-flight-with-hellas-sat-3inmarsat-s-ean-and-gsat-17/

Launch timeline for Ariane 5's flight with Hellas-Sat 3/Inmarsat S EAN and GSAT 17
June 28, 2017 Stephen Clark

An Ariane 5 rocket will make its fourth flight of the year Wednesday, hauling two communications satellites into orbit for Inmarsat, Hellas-Sat and India's space agency.

The nearly 180-foot-tall (55-meter) launcher will blast off from Kourou, French Guiana, at 2059 GMT (4:59 p.m. EDT; 5:59 p.m. French Guiana time) with the Hellas-Sat 3/Inmarsat S EAN and GSAT 17 communications satellites.

Made in France by Thales Alenia Space and in India by the Indian Space Research Organization, respectively, Hellas-Sat 3/Inmarsat S EAN and GSAT 17 will ride aboard the Ariane 5 in a dual-payload stack. The larger of the two satellites, Hellas-Sat 3/Inmarsat S EAN, will deploy first, followed by separation of GSAT 17 around 42 minutes after liftoff.

The rocket will target an orbit ranging from 155 miles (250 kilometers) to 22,236 miles (35,786 kilometers), with a tilt of 3 degrees to the equator.

Спойлер

Date source: Arianespace

T-0:00:00: Vulcain 2 ignition


The Ariane 5's first stage Vulcain 2 main engine ignites as the countdown clock hits zero, throttling up to about 300,000 pounds of thrust and undergoing a computer health check before liftoff.

T+0:00:07: Solid rocket booster ignition and liftoff


The Ariane 5's two solid rocket boosters ignite seven seconds later, each generating more than 1.3 million pounds of thrust, to push the vehicle into the sky from the ELA-3 launch pad.

T+0:00:50: Mach 1


The Ariane 5 rocket surpasses the speed of sound, heading east over the Atlantic Ocean.

T+0:02:19: Solid rocket boosters jettisoned


After each consuming 240 metric tons, or about 530,000 pounds, of pre-packed propellant, the solid rocket boosters are jettisoned.

T+0:03:17: Payload fairing jettisoned


The Ariane 5's 17.7-foot-diameter (5.4-meter) payload fairing, made in Switzerland by Ruag Space, releases in a clamshell-like fashion once the rocket flies above the denser, lower layers of Earth's atmosphere.

T+0:08:52: Vulcain 2 shutdown


The Ariane 5's core stage Vulcain 2 main engine shuts down after consuming 175 metric tons (385,000 pounds) of cryogenic liquid hydrogen and liquid oxygen propellants.

T+0:08:58: Stage separation

The Ariane 5's first and second stages separate. The 98-foot-long (30-meter) first stage will fall into the Atlantic Ocean near the Gulf of Guinea off the west coast of Africa.[/SIZE]

T+0:09:02: HM7B ignition


The Ariane 5's upper stage HM7B engine ignites for a 15-minute, 54-second burn to place the Hellas-Sat 3/Inmarsat S EAN and GSAT 17 satellites into geostationary transfer orbit. The HM7B engine burns liquid hydrogen and liquid oxygen, and generates more than 14,000 pounds of thrust.

T+0:25:04: HM7B shutdown


The HM7B engine shuts down after placing the Hellas-Sat 3/Inmarsat S EAN and GSAT 17 satellites into geostationary transfer orbit with a low point of 155 miles (250 kilometers), a high point of 22,236 miles (35,786 kilometers), and an inclination of 3 degrees to the equator.

T+0:28:17: Hellas-Sat 3/Inmarsat S EAN separation


The Hellas-Sat 3/Inmarsat S EAN satellite, riding in the upper position on the Ariane 5's dual-payload stack, deploys to begin an 17-year mission supporting the European Aviation Network for Inmarsat and broadcasting television and other services across Europe, Africa and the Middle East for Hellas-Sat.

T+0:29:58: Sylda 5 separation

The Sylda 5 dual-payload adapter structure jettisons from the Ariane 5 upper stage, revealing the GSAT 17 spacecraft for deployment.[/SIZE]

T+0:41:47: GSAT 17 separation


The GSAT 17 spacecraft is released from the Ariane 5 launcher to provide communications and data relay services over India.

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Включен счетчик обратного отсчета до начала видеотрансляции

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06/28/2017 20:49
T-minus 3 hours, 10 minutes. The Ariane 5 rocket's first stage, known by the French acronym EPC, is currently being filled with liquid oxygen and liquid hydrogen. The second stage, or ESC-A, should also be receiving the same mix of liquid propellants. The first stage Vulcain 2 engine and the upper stage HM7B engine both consume the super-cold fuel.

The cryogenic propellant will be gradually pumped inside the rocket to maintain proper levels as the fuel evaporates over the rest of the countdown.

The Ariane 5's supply of cryogenic liquid helium, used to pressurize the rocket's propellant tanks, was loaded aboard the launcher Tuesday.

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Spaceflight101 LIVE‏ @S101_Live 19 мин. назад

The Inmarsat payload delivers three S-Band coverage zones for airline passenger connectivity throughout Europe.

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Spaceflight101 LIVE‏ @S101_Live 18 мин. назад

The HellasSat portion hosts 47 Ku & 1 Ka-Band transponders for TV & broadband distribution over Europe, the Middle East & Africa.

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Arianespace‏ @Arianespace 58 сек. назад

Today our #Ariane5 will embark on a mission to strengthen telecommunications across multiple regions #VA238 http://bit.ly/2tqaDDC

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Spaceflight101 LIVE‏ @S101_Live 2 мин. назад

L-1 Hour: One hour to the opening of Ariane's launch window to send two satellites on their way. #Ariane5 http://bit.ly/2shXTyD

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Spaceflight101 LIVE‏ @S101_Live 1 мин. назад

Heading into the final hour of the count, #Ariane5 receives its refined flight software based on current upper level winds.


26 сек. назад

Teams also conduct checks of weather conditions, readiness of downrange tracking stations and continue monitoring all LV systems. #Ariane5

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Vol Ariane 238 – Lanceur en zone de lancement
Le lanceur Ariane 5 a quitté le Bâtiment d'Assemblage Final (BAF) pour être transféré sur sa Zone de Lancement (ZL3). Décollage prévu le 28 juin à 17:59 (heure locale). A son bord ses passagers, les 2 satellites HS3-IS & GSAT-17.

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Inmarsat‏Verified account @InmarsatGlobal 16 сек. назад

Our #EANsat is in flight configuration and go for launch at 20:59 UTC