ViaSat-2, Eutelsat 172B - Ariane 5 ECA (VA237) - Куру ELA3 - 01.06.2017, 23:45 UTC

[mik73]

Значит где-то нас обманывают.
Масса для Viasat-2 в разных источниках от 6400 до 6800 (у самого Viasat подробностей нет, у Гюнтера 6400, на SatBeams 6700, у кого еще  6800 (в ангельской вике тож 6800, но видел не только там, не помню где).
Для Eutelsat 172B везде 3500.

Если всего 9900+, то получается, что  Гюнтер ближе всех к истине. 

[tnt22]

ViaSat Inc.‏ @ViaSatInc 31 мин. назад

Once ViaSat-2 is in its final orbital slot, we test it to ensure it's ready for operation: http://bddy.me/2r4aYHX  #VS2 #InternetfromSpace

https://www.viasat.com/news/what-happens-after-viasat-2-launches-step-2-orbit-test

What Happens After ViaSat 2 Launches: Step 2. In-Orbit Test

After we have designed, built and launched a satellite into space, and it has reached its geostationary orbital slot, we do not immediately call it operational. In fact, we commence the next phase of the process, known as In-Orbit Test (IOT), which evaluates the health of the satellite and characterizes its performance post launch.

IOT is the last major test on the satellite before it goes into service and is necessary for a number of reasons:

• To make sure that the satellite meets all performance requirements in our contract with the satellite provider (in the case of ViaSat-2 that would be Boeing). If it doesn't, then there are contractual remedies for that.
• To make sure that nothing broke during launch or orbit raising phases.
• To characterize the satellite's actual, on orbit performance so that we more acutely determine the services that the satellite can provide to our customers.
  

In IOT, we thoroughly test all bus and payload systems and compare the results to the ground test results performed by Boeing prior to launch, in order to determine overall health and performance.

Additionally, we'll perform antenna mapping where the satellite is pitched and rolled to move each beam through a ground station so that we can measure its Radio Frequency (RF) performance. The trick here is to capture as many beams on each pitch or roll cut to minimize the time and fuel necessary to perform the cuts, but still characterize each beam.

Finally, once IOT is complete, the satellite provider will compile all of the data and will hold an IOT review with ViaSat. The goal of the review is to declare the satellite to be healthy and specification compliant. Once this occurs, the satellite provider will hand over control of the satellite to ViaSat.

At this point, the satellite is ready to deliver high-speed, high-quality broadband internet service.

[Pirat5]

mik73 пишет:
Значит где-то нас обманывают.

tnt22 же написал: 

This mission – the 237th overall by an Ariane launcher – will mark a new all-time Arianespace record for a total payload weight orbited: 10,865 kg., including a net mass at liftoff of 9,969 kg. for the two satellites.

т.е. ViaSat-2 - 6418 кг, Eutelsat 172B - 3551 кг. Вместе получается 9969 кг. А вместе с переходником Sylda между спутниками получается 10865 кг. В чем заключается вопрос?

[mik73]

Pirat5 пишет:
В чем заключается вопрос?

Уже не в чём. Точнее в том, что в разных источниках масса ViaSat-2 очень разная. Разобрались. Закрыли тему.

[tnt22]

Arianespace Flight VA237: ViaSat-2 and EUTELSAT 172B
 

Arianespace

Опубликовано: 29 мая 2017 г.

(0:20)

[tnt22]

Arianespace Flight VA237: ViaSat-2 and EUTELSAT 172B
 

Arianespace

Опубликовано: 29 мая 2017 г.

(2:52)

[Магадан Магадан]

mik73 пишет:

Pirat5 пишет:
В чем заключается вопрос?

Уже не в чём. Точнее в том, что в разных источниках масса ViaSat-2 очень разная. Разобрались. Закрыли тему.

Спутник ожидается очень интересный, если все получится будет мировым рекордсменом по пропускной способности. Попадались цифры 280-300-320 Гбит/с и зона обслуживания супер. Гвоздь в крышку традиционных ФСС спутников.     

[tnt22]

Eutelsat 172B - The satellite for In-Flight Connectivity
 

Eutelsat SA

Опубликовано: 23 мая 2017 г.

(0:38 )

[tnt22]

EUTELSAT 172B, a custom-designed HTS mission for mobility services [INTERVIEW]
 

Eutelsat SA

Опубликовано: 26 мая 2017 г.

(0:59)

[tnt22]

EUTELSAT 172B, the new flagship satellite for the Asia-Pacific region [INTERVIEW]
 

Eutelsat SA

Опубликовано: 29 мая 2017 г.

Jean-François Fenech, CEO - Eutelsat Asia, presents the main customer benefits of EUTELSAT 172B, a unique satellite designed to provide mobility, video and data services in a dynamic region.

(0:50)

[tnt22]

ViaSat, Inc. Is Launching ViaSat-2 Communications Satellite


ViaSat Inc.

Опубликовано: 25 мая 2017 г.

Groundbreaking technology. Record breaking speeds. State-of-the-art internet experiences.

On June 1, ViaSat-2 will launch into space. As the world's foremost communications satellite, ViaSat-2 will deliver 300 Gigabits per second (Gbps) of total network capacity, improve broadband speeds significantly and provide seven times the coverage over its predecessor, ViaSat-1.

This satellite system will show the world that satellite is not a service of last resort, but a strong terrestrial broadband service alternative.

(1:05)

[Магадан Магадан]

tnt22 пишет:

EUTELSAT 172B, a custom-designed HTS mission for mobility services [INTERVIEW]   
 
     
 г.

Конкурент Ямал-300К ?

[tnt22]

Анимация - За 24 часа до пуска (на фр.)

Ariane 5 : que se passe-t-il 24h avant le lancement ?
 

CNES

(5:46)

[tnt22]

Arianespace Flight VA237: ViaSat-2 and EUTELSAT 172B


Arianespace

Опубликовано: 29 мая 2017 г.

(2:58 )

[tnt22]

http://www.arianespace.com/mission-update/va237-approved-for-liftoff/

Ariane 5 | May 30, 2017

Arianespace's Ariane 5 is "go" for liftoff on June 1 with the ViaSat-2 and EUTELSAT 172B satellite passengers

The sixth Arianespace launch of 2017 is approved for liftoff on June 1 fr om the Spaceport in French Guiana, with the heavy-lift Ariane 5 now complete with its dual-satellite payload of ViaSat-2 and EUTELSAT 172B.

The authorization for this week's mission – designated Flight VA237 in Arianespace's launcher family numbering system – followed today's Launch Readiness Review, which confirmed the "go" status for Ariane 5, its two spacecraft passengers, the Spaceport infrastructure and the network of tracking stations.


Flight VA237's dual payload is integrated in the Spaceport's Final Assembly Building, with EUTELSAT 172B positioned atop Ariane 5's core stages (at left), followed by the lowering of the "upper composite," consisting of ViaSat-2 and the SYLDA dispenser system, protected by the launcher's payload fairing.

Flight VA237's Ariane 5 is now ready for rollout from the Final Assembly Building, wh ere ViaSat-2 and EUTELSAT 172B were integrated on the launcher, to the Spaceport's ELA-3 launch zone.

Liftoff will commence as soon as possible in a one-hour launch window that opens at 8:45 p.m. in French Guiana (between 23:45 and 00:45 Universal Time, during the night of June 1 to June 2).

ViaSat-2 and EUTELSAT 172B will be deployed into geostationary transfer orbit on a mission lasting just under 42 minutes.

Released first will be ViaSat-2, which is expected to bring considerable improvements in terms of speed, lower costs and extended broadband coverage within its footprint, which includes North and Central America, plus the Caribbean, northern South America, and the aeronautical and maritime routes in the Atlantic Ocean between North America and Europe. As a global broadband services and technology company, ViaSat operates from corporate headquarters in Carlsbad, California.

ViaSat-2 was built by Boeing in El Segundo, California, using a 702HP platform, and will be positioned at 70 deg. West.

EUTELSAT 172B's deployment by Ariane 5 will complete Arianespace's Flight VA237. Operating at an orbital position of 172 deg. East for Asia-Pacific reach over land and sea from Alaska to Australia, the relay platform will deliver increased capacity for fast-growing applications that include in-flight and maritime connectivity, cellular backhaul, corporate networks, video distribution and government services. This satellite will join the fleet of Paris-based Eutelsat, a leading satellite operator in Europe, the Middle East and Africa.

Using the new all-electric Eurostar E3000 EOR (Electric Orbit Raising) platform assembled by Airbus in Toulouse, France, EUTELSAT 172B is the initial all-electric telecommunications satellite built in Europe – and the first orbited by Ariane 5.

Flight VA237 maintains Arianespace's busy launch schedule in 2017, during which the company is targeting a total of 12 flights using its heavy-lift Ariane 5, medium-lift Soyuz and lightweight Vega vehicles. The five missions already performed this year have utilized two Ariane 5s, two Soyuz launchers and one Vega.

Larger versions of the photos above are available to download in the Gallery.
 
Launch window for Flight VA237:

French Guiana	Universal Time (UTC)	Washington, D.C.	Paris
Between 8:45 p.m. and  9:45 p.m. on June 1	Between 23:45 and  00:45 on June 1/2	Between 7:45 p.m. and  8:45 p.m. on June 1	Between 1:45 a.m. and  2:45 a.m. on June 2

[tnt22]

VA237 Launch Readiness Review (RAL) - 163751 B, 2 стр
VA237 La Revue d'Aptitude au Lancement (RAL) - 169982 B, 2 стр

Спойлер

 

[свернуть]

[tnt22]

Arianespace‏ @Arianespace 12 мин. назад

Launch readiness confirmed! Approval given for @Arianespace's #Ariane5 #VA237 liftoff w/ ViaSat-2 and EUTELSAT 172B: http://bit.ly/2qxhutV

[tnt22]

Vanessa O'Connor‏ @VanessaEutelsat 7 ч назад

Cool @Eutelsat_SA info on EUTELSAT 172B sat. 39.2 m wingspan equivalent to 3 double-decker coaches in a row. #VA237 #LetsLaunch on 1 June!

[tnt22]

ViaSat Inc.‏ @ViaSatInc 7 ч. назад

12 Fun Facts About ViaSat-2. #VS2 #ViaSatInc #InternetfromSpace

[tnt22]

Arianespace Flight VA237: ViaSat-2 and EUTELSAT 172B
 

Arianespace

Опубликовано: 30 мая 2017 г.

(3:32)