Author Topic: Ariane 5 VA255 - SES-17 & Syracuse-4A - October 24, 2021 (02:10 UTC)  (Read 25624 times)

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SES-17

THALES AND SES DELIVER THE MOST EFFICIENT KA-HTS AVIATION CONNECTIVITY SOLUTION OVER THE AMERICAS, September 12, 2016

Key Points

Thales signs an agreement with SES for tailor made connectivity services over the Americas optimized for commercial aviation.
With FlytLIVE, inflight connectivity solution by Thales, airlines will receive the best connection speeds for passengers and passenger entertainment using Ka-band HTS.
Two currently in-orbit satellites comprise the initial network for the Americas; a third satellite provided by Thales Alenia Space – will be launched in 2020 to meet anticipated market growth over the Americas.

Thales, a global leader in space, avionics, and connected inflight entertainment, announces two milestone agreements with SES, the world’s leading satellite operator. With these agreements, Thales will offer airlines and their passengers FlytLIVE, the most efficient inflight connectivity experience over the Americas. FlytLIVE by Thales will start operating mid 2017 using in-orbit satellites.

To meet the needs of a growing market, SES will procure a new satellite specifically designed for the needs of FlytLIVE and manufactured by Thales Alenia Space to be launched in 2020. The satellite’s architecture is based on Thales Alenia Space’s all-electric version of the Spacebus NEO platform, the highest performing satellite in the global connectivity market.

“Thales works together with its customers to help drive digital transformation across a broad range of sectors; whether it be aviation, ground transportation, aerospace, defence or security. Through this partnership with SES, and by leveraging Thales Alenia Space’s expertise, we are developing a satellite uniquely optimized for the fast moving aviation and mobility market. This will enable us to offer airline customers, a simple and seamless connectivity solution with unmatched performance.”           
Patrice Caine, Chairman and CEO, Thales Group

FlytLIVE by Thales, a simple and seamless connectivity solution for airlines, with unmatched performance for their passengers:
With FlytLIVE, passengers will enjoy full Internet services including video streaming, games, social media and live television, creating an immersive and engaging experience in the air.

Airlines will take advantage of Thales’s full end-to-end solutions including products such as the modular antenna and multi-frequency radome, in-cabin Wi-Fi and portal platform. The offering also provides bandwidth and session management, content delivery, operational support tools, line maintenance and turnkey service and support with high Service Level Agreements.
 
How it will be delivered:
FlytLIVE services will use the SES unsurpassed connectivity network of Ka-band High-Throughput Satellite (HTS) services optimized for airlines who want the best connection speeds for their customers.

SES-17 is another keystone in our unique satellite architecture and a major milestone in the execution of our strategy to build a differentiated portfolio of high throughput systems for very distinct customer needs. The new satellite will further strengthen our network capabilities to deliver unmatched next generation connectivity services. SES-17 is tailor-made for customers who demand globally flexible, scalable, future-proof and resilient solutions in the aeronautical sector, but also in other demanding data markets. The procurement of SES-17 also illustrates our long-standing relationship with Thales Alenia Space, which has built 12 satellites for O3b and is in the midst of building another eight.”
Karim Michel Sabbagh, President & CEO of SES.

Thales InFlyt Experience, Thales Alenia Space and SES specifically developed the network and satellite architecture for the unique connectivity requirements of commercial aviation customers resulting in better services, more efficient operations and cost savings. SES will operate the satellites and the ground network. The services will be ready for airline and passenger use by summer of 2017 and will be provided by two satellites that are currently in-orbit.
The third satellite in the network to be launched, SES-17, will be optimized for the fast-moving aviation and mobility market over the Americas. It will provide new Ka-HTS bandwidth over this region to meet current and future speed, coverage and quality expectations of crowded skies and increasing passenger service demands as regional airline passenger traffic is forecasted to nearly double by 2030[1].

The satellite will be equipped with close to 200 spot beams of mixed size for more flexible allocation of capacity over high-traffic airline routes and field-of-view beams to enable the most efficient delivery of Internet, live broadcast television and real-time content delivery.
SES-17 will cover North America, South America, Central America, the Caribbean and the Atlantic ocean. The network will provide substantial gains over today’s broadband connections, ensuring ultra-high speeds, capacity, coverage and quality.
« Last Edit: 10/24/2021 02:04 am by zubenelgenubi »
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Here's the press release:

Quote
SES selects Arianespace for launch of SES-17, September 12, 2017

The Luxembourg-based operator’s telecommunications satellite will be one of the largest ever launched by Arianespace.

SES has selected Arianespace to launch its high-power, high-throughput satellite SES-17 on an Ariane 5 in 2021 from the Guiana Space Center in Kourou, French Guiana. This was announced by SES and Arianespace in Paris today.

SES-17 is a powerful satellite delivering high-speed inflight connectivity and high-powered data services over the Americas and the Atlantic Ocean. SES-17 is the 53rd satellite entrusted to Arianespace for launch by SES (Euronext Paris and Luxembourg Stock Exchange: SESG).

Weighing more than six metric tons at launch, SES-17 will be among the ten largest telecom satellites launched by Arianespace since the company’s founding.
SES-17 is the third all-electric satellite for which SES has chosen an Arianespace launch.

The satellite built by Thales Alenia Space is fitted with an electric propulsion system for orbital positioning and station-keeping; its payload comprises 200 Ka-band spotbeams; the orbital position of the spacecraft has not yet been disclosed.

“SES and Arianespace have developed an exceptional partnership over the past 30 years”, said Martin Halliwell, Chief Technology Officer of SES. “With this launch, we build on that relationship and underline our commitment to the European space industry. Together with today’s agreement with Arianespace to launch the next four spacecraft of our O3b constellation on Soyuz in 2019, we are satisfied to conclude two important contracts with Arianespace giving us the necessary and reliable access to space that we need to further develop and drive our business.”

Stéphane Israël, CEO of Arianespace, noted: “This latest contract reflects the excellent relations built between Arianespace and SES over the past three decades. Our order book speaks for itself, with now 10 satellites to be launched for SES by 2021.

“We are honored to have been selected by SES for the launch of the new-generation SES-17 – an impressively sized, all-electric satellite – which shows Arianespace’s ability to adapt to customers’ evolving requirements. SES’ continued trust in Arianespace is a clear demonstration that our Ariane 5 heavy-lift launcher is keeping pace with these changing technologies, prior to the advent of our new-generation Ariane 6 launch vehicle – for which discussions are underway to serve future SES missions.”
« Last Edit: 01/19/2021 07:24 pm by zubenelgenubi »
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Ariane 5 VA255 - SES-17 & Syracuse-4A - late September 2021
« Reply #2 on: 01/21/2021 07:24 am »
Syracuse 4A

THALES ALENIA SPACE AND AIRBUS DEFENCE AND SPACE WIN FRENCH GOVERNMENT CONTRACT TO SUPPLY COMSAT NG MILITARY SATELLITE COMMUNICATIONS SYSTEM, December 23, 2015

French defense procurement agency DGA (Direction générale de l’armement), part of the Defense Ministry, has selected the consortium formed by Thales Alenia Space (65%) and Airbus Defence and Space (35%) to build and deliver the military satellite communications system, Comsat NG. As lead contractor, Thales Alenia Space will be in charge of relations with the Ministry of Defense.

The Comsat NG contract covers the construction and launch of two military communications satellites for the French armed forces, to replace the Syracuse 3A and Syracuse 3B satellites, launched in 2005 and 2006, respectively. These new satellites will enter in service in 2021 and will give France a higher performance system featuring new services.

Offering a design life of 15 years, the two satellites will have identical X and Ka-band payloads, built by Thales Alenia Space as prime contractor. One will use the full electric Spacebus Neo platform, while the other will be built on the Eurostar 3000 platform. The Comsat NG satellites will feature unrivaled resistance to even the most extreme jamming methods, thanks to state-of-the-art equipment, including an active anti-jamming antenna and a digital onboard processor.

The contract also includes an extensive ground segment, including construction of the ground control and mission facilities, mainly calling on Thales Alenia Space’s Space Ops solutions. It will also include the refurbishment of ground stations in France and operating and maintenance support for a period of 17 years.

“I would like to thank the French Ministry of Defense for choosing us for this strategic contract, reflecting their renewed confidence in Thales Alenia Space,” said Jean Loïc Galle, President and Chief Executive Officer of Thales Alenia Space

The Comsat NG satellites will extend and enhance the mission carried out by the Syracuse satellites in terms of exchanging information between mainland France and theaters of operation, and between different theaters, no matter how far apart they may be. They will also address growing data capacity requirements, driven in large part by the increased use of video transmissions.
« Last Edit: 06/19/2021 03:32 am by zubenelgenubi »
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Offline GWR64

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Cross-posts:
Planned launches:
Date - Satellite(s) - Rocket - Launch Site - Time (UTC)

2021
March 4 - Star One D2, Eutelsat Quantum - Ariane 5 ECA+ (VA254) - Kourou ELA-3
Q3 - SES-17, Ovzon-3 - Ariane 5 ECA+ (VA255) - Kourou ELA-3
Q4 - Ovzon-3 - Ariane 5 ECA - Kourou ELA-3
October 31 - JWST (James Webb Space Telescope) - Ariane 5 ECA+ (VA256) - Kourou ELA-3
December - MEASAT-3d, Syracuse 4A (Comsat-NG 1) - Ariane 5 ECA+ (VA257) - Kourou ELA-3 (or January 2022)
Late - Syracuse 4A (Comsat-NG 1) - Ariane 5 ECA - Kourou ELA-3

Changes on January 10th

I got some information about the flights for this year:

<snips>
VA254 - Officially March 4th (most likely late May or June, due to delays related to new modifications to the launcher fairing)
VA255 - Mid-August, IF the VA254 campaign is not delayed any further
VA256 - Officially October 31st, with JWST

There may be another Ariane 5 flight this year, but it's unlikely.

Ovzon, As of October 21, 2020: https://www.ovzon.com/en/interim-report-january-september-2020/

Quote
Ovzon 3 on schedule

Ovzon 3, which is now under production at our partner Maxar in the US, is planned to be launched during the fourth quarter of 2021. ...

Spaceflight now sees the launch of Syracuse 4A with SES-17.
https://spaceflightnow.com/2021/01/11/james-webb-oneweb-highlight-arianespaces-2021-launch-schedule/

Offline GWR64

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« Last Edit: 03/26/2021 04:09 pm by GWR64 »

Online zubenelgenubi

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Belated schedule confirmation:
https://spaceflightnow.com/launch-schedule/ [March 31 update]
Quote
August • Ariane 5 • SES 17 & Ovzon 3
Launch window: TBD
Launch site: ELA-3, Kourou, French Guiana
EDIT: Confirmation (via SFN's sources) that VA255 is currently scheduled to launch in August.
I do wonder if we'll see a payload swap of Ovzon-3 to another flight?
Or a delay of VA255 into September?
« Last Edit: 04/07/2021 11:24 pm by zubenelgenubi »
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Offline Jansen

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https://spacenews.com/intelsat-and-ses-on-course-for-mammoth-c-band-payments/
Quote
SES-17 and O3b mPOWER secured $180 million worth of backlog in 2021, according to SES, increasing their gross backlog to $740 million.

The company said these satellite launches had been pushed from the third quarter to the fourth quarter of this year, adding that it does not expect a significant change in operational service date as a result.

Delayed to Q4

Online zubenelgenubi

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Cross-post:
SFN Launch Schedule, updated June 18
SES 17 and Syracuse 4A = VA255
Launch in late September 2021
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Cross-post:
Quote
By this application, SSC Space US, Inc. dba Universal Space Network (collectively, "USN"),1 a Delaware Corporation, seeks FCC approval to support the Launch and Early Orbit (LEOP) support of the Syracuse4A spacecraft on it’s way to geosynchronous parking position at 46 degrees east.  The spacecraft will be launched from French Guiana on an Ariane vehicle no earlier than October 15th, 2021 at 00:15:00 UTC. USN has been contracted to support the Syracuse4A spacecraft LEOP for a period of up to    30 days.   

The spacecraft will be injected into a highly elliptical orbit at inclination of about 6 degrees.  The spacecraft will begin electrical propulsion after initial orbit checkout to raise the orbit.  Additional authorization may be requested to support electrical propulsion beyond 30 days.  Each spacecraft contact can range from a few minutes at perigee to as much as 9 hours at apogee.
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French Guiana orbital launches for the remainder of 2021 (and into 2022):
Launched:
Date - Satellite(s) - Rocket - Launch Site - Time (UTC)

2021
October 24 Q3 mid-August August Q4 late September October 15 22 23 TBD - SES-17, Syracuse-4A Ovzon-3 or Syracuse-4A - Ariane 5 ECA+ (VA255 TBD VA255 VA257?) - Kourou ELA-3 - 02:10 00:15 TBD 01:01to 03:30
(approximately 2 weeks minimum between CSG launches; GTO orbit: approximately 4-6 minutes later/day)

Planned launches:
Date - Satellite(s) - Rocket - Launch Site - Time (UTC)

2021
Early? November October/Q4 mid Oct NET late Oct/NLT early Nov early Oct? Oct/Q4 - CERES 1, CERES 2, CERES 3 - Vega (VV20 VV21?) - Kourou ZLV
(approximately 2 weeks minimum between CSG launches; approximately 6 weeks minimum between Vega launches)

December 1 Midyear September NET late November end of Nov or beginning of Dec /NET Nov 22 23 - Galileo-FOC FM23 (Patrick), Galileo-FOC FM24 (Shriya) - Soyuz ST-B/Fregat-MT (VS26 TBD VS26 TBD VS27) - Kourou ELS - 00:35 01:07:49 TBD
(approximately 2 weeks minimum between CSG launches)

December 18 October 31 NET November NET mid-November late November NET early December - JWST (James Webb Space Telescope) - Ariane 5 ECA+ (VA256 TBD VA256 VA256?) - Kourou ELA-3 - 12:10-15:10? 12:20-15:20
(approximately 2 weeks minimum between CSG launches)

2022
January 6 TBD 2021? TBD 2022 November October November/early November December 29 - OneWeb (x34) Flight 13 13 TBD - Soyuz-ST-B/Fregat-MT (VS27 TBD VS27 TBD VS26) - Kourou ELS
(approximately 2 weeks minimum between CSG launches; approximately 3 weeks minimum between Soyuz-ST launches)

Changes on January 10th
Changes on January 11th
Changes on January 18th
Changes on January 30th
Changes on March 19th
Changes on March 21st
Changes on March 31st
Changes on April 6th
Changes on May 6th
Changes on May 12th
Changes on May 13th
Changes on May 26th
Changes on June 16th
Changes on June 18th
Changes on June 22nd
Changes on July 18th
Changes on July 27th
Changes on August 5th
Changes on August 6th
Changes on August 7th
Changes on August 9th
Changes on August 17th
Changes on September 8th
Changes on September 10th
Changes on September 30th
Changes on October 5th
Changes on October 11th
Changes on October 13th
Changes on October 14th
Changes on October 19th
Changes on October 22nd
Changes on October 23rd
Changes on October 24th
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« Last Edit: 10/27/2021 09:04 am by zubenelgenubi »
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Syracuse-4A arrived. The Spacebus-Neo container is huge.

https://twitter.com/DutchSpace/status/1433836362575323143

a couple of pictures there too: https://www.facebook.com/pg/association.anciens.du.csg/photos/?tab=album&album_id=877810965629674

What's in the triangular container?


Offline GWR64

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I believe TAS only has this one container for Spacebus NEO.
Antonov UR-82007 will likely wait for the Syracuse 4A to unload.
Then fly back to Nice with the empty container and pick up the SES-17 satellite.
Difficult logistics.

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I believe TAS only has this one container for Spacebus NEO.
Antonov UR-82007 will likely wait for the Syracuse 4A to unload.
Then fly back to Nice with the empty container and pick up the SES-17 satellite.
Difficult logistics.
UR-82007 flew from Cayenne to Lajes in the Azores before making another stop in Nice followed by flying to Toulouse. It's now flying back Cayenne likely with SES-17.
Launches Seen: Atlas V OA-7, Falcon 9 Starlink 6-4, Falcon 9 CRS-28,

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From the Arianespace announcement of the VA256/JWST launch date, we learn VA255 is now scheduled to launch October 22.

Will the launch time of day shift?  4 minutes earlier/day for a GTO launch?
« Last Edit: 09/08/2021 03:28 pm by zubenelgenubi »
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I believe TAS only has this one container for Spacebus NEO.
Antonov UR-82007 will likely wait for the Syracuse 4A to unload.
Then fly back to Nice with the empty container and pick up the SES-17 satellite.
Difficult logistics.
UR-82007 flew from Cayenne to Lajes in the Azores before making another stop in Nice followed by flying to Toulouse. It's now flying back Cayenne likely with SES-17.

https://www.ses.com/press-release/ses-17-launch-22-october
Quote
SES-17 to launch on 22 October

14 Sep 2021

Built by Thales Alenia Space, the SES satellite will deliver high-speed connectivity services to mobility, enterprise and government segments across the Americas

Cannes, France/ Luxembourg, 14 September 2021 – SES-17 has completed its performance tests at the Thales Alenia Space facility in Cannes, France and is being prepared for shipment to Arianespace’s Guiana Space Centre in Kourou, French Guiana on 22 September 2021. The spacecraft is scheduled to be launched by Arianespace, using an Ariane 5 vehicle on 22 October 2021, SES announced today.

SES-17 is a very high-throughput satellite in geosynchronous orbit, built to serve North America, South America, the Atlantic Ocean and the Caribbean with Ka-band coverage. It will address demands for high-speed and flexible data connectivity across aviation, maritime, enterprise and government segments, advancing the region’s digitalisation objectives and helping to bridge the digital divide. For commercial aviation, SES is proud to partner with its anchor customer, Thales Avionics.

So SES-17 is not in Kourou yet, something else was in the Antonov 82007.

 ??? -> https://forum.nasaspaceflight.com/index.php?topic=54145.msg2287740#msg2287740
« Last Edit: 09/14/2021 12:24 pm by GWR64 »

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Antonov 007 landed in Chayenne. This time most likely with SES-17 on board.
Flew from Nice via Cape Verde to Chayenne.

https://de.flightaware.com/live/flight/UR82007
« Last Edit: 09/23/2021 10:01 am by GWR64 »

Offline bolun

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Antonov 007 landed in Chayenne. This time most likely with SES-17 on board.
Flew from Nice via Cape Verde to Chayenne.

https://de.flightaware.com/live/flight/UR82007

Yes, it is SES-17

SES-17 satellite has arrived French Guyana

Quote
SES-17 telecommunications satellite left Thales Alenia Space’s clean rooms of Cannes on September 22nd, and has just reached Europe’s spaceport, in French Guiana. The satellite is scheduled for launch on October 22nd, where it will be orbited by Arianespace jointly with another Thales Alenia Space-built satellite: Syracuse 4A.

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Cross-post:
https://cnes-csg.reservationlancement.fr/en/Inscription/Lancements
According to that, the Ariane VA 255 launch is scheduled for October 23 at 01:01 UTC.
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Is mission patch revealed?

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Expect hype to flow in the European space environment, and particularly at the IAC next week, if as we all expect this launch goes off without a hitch.
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SFN Launch Schedule, dated October 19:
Launch window on October 23: 01:01 to 03:30 UTC
« Last Edit: 10/20/2021 11:11 am by zubenelgenubi »
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The Ariane 5 and 6 worlds touch (their fairings, specifically):

https://twitter.com/ariane5/status/1450427565047439364
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October 20, 2021

Ariane 5 on the cusp of three records with SES-17 and SYRACUSE 4A launch

- For its 11th launch of 2021 with the second Ariane 5 of the year, scheduled for October 22, Arianespace will orbit two geostationary satellites: SES-17, a high throughput satellite operated by SES and SYRACUSE 4A, a satellite developed for the French Ministry of Defense.

– This 111th Ariane 5 mission will mark three new milestones for the heavy-lift European launcher: it will carry an overall performance of approximately 11.2 tons, the combined mass of its two payloads will reach 10.263 tons and it will be precisely 1.5 meter taller than usual.

Arianespace’s next Ariane 5 launch from Europe’s Spaceport in French Guiana, is scheduled on Friday, October 22, 2021, during a launch window from 10:01 p.m. to 00:30 a.m. local time (01:01 a.m. to 03:30 a.m. UTC on Saturday, October 23).

The two satellites, manufactured by Thales Alenia Space, will both serve the needs for connectivity. SES-17 will deliver high-speed inflight and maritime connectivity services as well as connecting underserved companies or communities while SYRACUSE 4A will serve French sovereignty by connecting its armed forces all over the world.

SES-17: This telecommunications satellite provides excellent coverage over the Americas, the Caribbean and over the Atlantic Ocean and has been designed to transform the aviation connectivity landscape and to accelerate digital inclusion initiatives. It features almost 200 spot beams, the power of which can be dynamically adjusted in step with customers’ changing requirements. It is also the first SES satellite to have a totally digital payload and is powered by an advanced digital transparent processor (DTP), enabling far greater flexibility and efficiency than previously available.The Luxembourg based operator’s telecommunications satellite will be one of the largest ever launched by Arianespace.

SYRACUSE 4A: This military communications satellite, commissioned by the DGA (Direction Générale de l’Armement), France’s defense procurement agency, will allow to connect the armed forces together when deployed. At sea, in the air or on the ground, militaries need secured and powerful communication means in order to be able to exchange information with the command center. Thanks to its state-of-the-art equipment (anti-jamming antenna and digital on board processor), SYRACUSE 4A will guarantee a high resistance to extreme jamming methods. At the service of France’s sovereignty, the satellite will also support NATO and European-led operations.

VA255, the 111th Ariane 5 mission, will see the heavy-lift European launcher break three records. With a total performance of approximately 11.2 tons, this will be the heaviest payload ever launched by Ariane 5 ECA, surpassing the previous record reached in 2017 with VA237, by nearly 300 kilos. The cumulative mass of its two payloads will reach 10,263 kilograms (6411 kilograms for SES-17 and 3852 kilograms for SYRACUSE 4A), the heaviest ever launched towards GTO orbit. VA255 will also be the tallest Ariane 5 ever launched with a fairing raised by 1.5 meter compared to standard configuration.

ArianeGroup is the lead contractor for the development and production of Ariane 5 and Ariane 6 launchers. The company coordinates an industrial network of more than 600 companies (including 350 SMEs). ArianeGroup oversees the entire Ariane 5 industrial supply chain, from performance optimization and associated studies, to production and mission-specific data and software. This chain includes equipment and structures, engine manufacturing, integration of the various stages, and launcher integration in French Guiana. ArianeGroup delivers a flight-ready launcher on the launch pad to its subsidiary Arianespace, which operates the flight from lift-off, on behalf of its customers.

Ariane 5 is a program of the European Space Agency (ESA), carried out in cooperation between public institutions and industry. Marketed and operated by Arianespace, the Ariane 5 launches take place from the Guiana Space Centre in Kourou, with the support of teams from the French space agency CNES.

https://www.arianespace.com/press-release/ariane-5-on-the-cusp-of-three-records-with-ses-17-and-syracuse-4a-launch/
Jacques :-)

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Meanwhile, @Arianespace is preparing for its next @ariane5 flight, #VA255, this week on 22 October (23 October CEST) from
@EuropeSpacePort. Stay tuned for more info!

https://twitter.com/esa/status/1450435415836663809

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Coming soon: launch of @Ariane5 #VA255, carrying two passengers: SES-17 and SYRACUSE 4A, for @SES_Satellites and @DGA. Stay tuned to @Arianespace for more details and the link to watch live (launch window opens 02:01 BST/03:01 CEST on 23 October)

https://twitter.com/esa/status/1451145574342959107

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Does anyone have more info on the 1.5m tall "raising cylinder"? Is it made of the same Al-alloy as the fairing or the skin of the Vehicle equipment bay? The Launch kit hints that the cylinder's mass might be around 450 kg (11.2t - satellite mass - SYLDA mass) - is this about right?

Since the raising cylinder's purpose seems to be to increase the fairing volume (height), are there, e.g., any special internal rails to guide SYLDA during its ejection sequence?

Does the change of the center of gravity have an effect on ESC-D Cryotechnic upper stage control and guidance? Was there, e.g., a new SW requirement, or was the (original) guidance system sufficiently flexible to cover a wider range of (forward) center of gravity positions?

And finally, what will be the total height of the "launcher"? 53.5m? 54m? 54.5m?

Offline GWR64

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Does anyone have more info on the 1.5m tall "raising cylinder"? Is it made of the same Al-alloy as the fairing or the skin of the Vehicle equipment bay? The Launch kit hints that the cylinder's mass might be around 450 kg (11.2t - satellite mass - SYLDA mass) - is this about right?

Since the raising cylinder's purpose seems to be to increase the fairing volume (height), are there, e.g., any special internal rails to guide SYLDA during its ejection sequence?

Does the change of the center of gravity have an effect on ESC-D Cryotechnic upper stage control and guidance? Was there, e.g., a new SW requirement, or was the (original) guidance system sufficiently flexible to cover a wider range of (forward) center of gravity positions?

And finally, what will be the total height of the "launcher"? 53.5m? 54m? 54.5m?

56.33 m I think
1 meter higher than VA247

https://twitter.com/dutchspace/status/1093489565132824577

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Since the raising cylinder's purpose seems to be to increase the fairing volume (height), are there, e.g., any special internal rails to guide SYLDA during its ejection sequence?

I believe the Sylda is bolted on top of the raising cylinder, no need for guiderails.

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Since the raising cylinder's purpose seems to be to increase the fairing volume (height), are there, e.g., any special internal rails to guide SYLDA during its ejection sequence?

I believe the Sylda is bolted on top of the raising cylinder, no need for guiderails.
Thanks! Does this imply that the satellite in the lower compartment (located below Sylda) has to clear the 1.5m tall ring?

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What's wrong with the GSE?
[Arianespace tweet]
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Edit: NSF members, please feel free to assist with the launch thread coverage.

VA255 launch coverage begins momentarily; at 24 minutes after the hour approximately 1 hour before launch window opens:
« Last Edit: 10/24/2021 01:14 am by zubenelgenubi »
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Cast opens with an all-green board.  Proceeding to a launch at window's opening at 01:01 UTC.

Three "firsts" for this launch:
Most massive satellites to geostationary transfer orbit (GTO) by any launch vehicle worldwide: total 10,623 kg

Most massive payload carried by Ariane 5 to GTO: over 11,200 kg

Tallest Ariane 5: 56.4 m

Both satellites are produced by Thales Alenia.
« Last Edit: 10/24/2021 01:23 am by zubenelgenubi »
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Launch countdown is on hold.

EDIT: Countdown reset to T-7 minutes.
« Last Edit: 10/24/2021 12:58 am by RotoSequence »

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Director of operations (DDO) confirmed the start of synchronized launch sequence at T-minus 07:00.

All green board changed to red at T-minus 06:05, segment "Ensemble de lancement."

And therefore, a red "Autorisation lancement."

The count returns to T-minus 07:00 if an issue arises during the synchronized launch sequence.

Launch is holding at T-minus 07:00.

Launch window extends from 01:01 to 03:30 UTC.
« Last Edit: 10/24/2021 02:41 am by zubenelgenubi »
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Standing by for more information on the red condition on the status board.

EDIT: The purported reason spoken by launch control is a range violation.
« Last Edit: 10/24/2021 01:09 am by RotoSequence »

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The webcast presenters are back. A pressure reading in the main stage of the launch vehicle had an unusual reading. Additional testing was performed, and the countdown is expected to resume shortly.

[zubenelgenubi: Countdown will resume from T-minus 07:00 minutes.]
« Last Edit: 10/24/2021 02:06 am by zubenelgenubi »

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https://twitter.com/Arianespace/status/1452091603963764738

Arianespace
@Arianespace
·
6m
Check-list done, liftoff planned for 2:10 UTC.
Follow us Live:


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Countdown resumed.

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Liftoff!

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SRB Jettison, right on schedule

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Nominal payload fairing separation

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A small presentation of the inauguration of the Ariane 6 pad and the upcoming Ariane 6 launch vehicle

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Nominal MECO, stage separation, and upper stage engine start.

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LOS Natal, expected

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Some discussion in the webcast of France's military space programs.

Upper stage engine shutdown. Preparing for SES-17 separation.
« Last Edit: 10/24/2021 02:38 am by RotoSequence »

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SES-17 has separated. Preparations for pre-Syracuse staging operations are underway.

https://twitter.com/Arianespace/status/1452102570978201600
« Last Edit: 10/24/2021 02:43 am by RotoSequence »

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SYLDAS separation confirmed.

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Right orientation for separation, and Syracuse-4A separation confirmed!

https://twitter.com/Arianespace/status/1452104909705338883
« Last Edit: 10/24/2021 02:50 am by RotoSequence »

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Stephane Israel did speak to the next launches, but either his statement or the English translation were muddled.

Four more launches before the year's end, including Vega, and James Webb Space Telescope on December 18.

No specific date given for Vega launch.

[No specific mention of the Galileo pair on Soyuz?]

[Fourth launch would be next OneWeb launch from Baikonur.]

I assume there was live coverage "en francais" but I can't find it.  Someone must have heard the closing statement "raw."

Edit: What I could not find for myself searching YouTube, the YouTube algorithm found for me!



A lesser item: the banter about the launch continued for several seconds over the appearance of the launch criteria violation,  before acknowledging it.

Edited
« Last Edit: 10/27/2021 09:14 am by zubenelgenubi »
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Congratulations to the entire launch campaign team!

Thank you, RotoSequence, mn, and hektor, for covering tonight's launch!

Also, noting that this is the second orbital launch worldwide 🌐 today UTC, after the launch of Shijian-21.
« Last Edit: 10/24/2021 03:54 am by zubenelgenubi »
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2021-094A/49332 in 242 x 35287 km x 6.07°
2021-095B/49333 in 249 x 35267 km x 5.92°

Offline Star One

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Archived launch video highlights:


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2021-094A/49332 in 242 x 35287 km x 6.07°
2021-095B/49333 in 249 x 35267 km x 5.92°
Delta v to GEO calculations for both objects:
2021-094A/49332:

Quote
Current Orbit: 242.0000 km x 35287.0000 km x 6.0700 degrees;
Apogee Speed: 1619.1639 m/s; Perigee Speed: 10199.7779 m/s; delta v to this orbit: 0.0000


Sub-sync transfer.

First maneuver:
Apogee changed to 35786km
Inclination changed to 6.0682 degrees
Current Orbit: 242.0000 km x 35786.0000 km x 6.0682 degrees;
Apogee Speed: 1601.2972 m/s; Perigee Speed: 10208.0580 m/s; delta v to this orbit: 8.2864


Second maneuver:
Perigee changed to 35786km
Inclination changed to 0 degrees
Current Orbit: 35786.0000 km x 35786.0000 km x 0.0000 degrees;
Apogee Speed: 3074.9218 m/s; Perigee Speed: 3074.9218 m/s; delta v to this orbit: 1500.5156


Total delta v to GEO: 1500.5156 m/s

2021-095B/49333:

Quote
Current Orbit: 249.0000 km x 35267.0000 km x 5.9200 degrees;
Apogee Speed: 1620.6279 m/s; Perigee Speed: 10193.3091 m/s; delta v to this orbit: 0.0000


Sub-sync transfer.

First maneuver:
Apogee changed to 35786km
Inclination changed to 5.9182 degrees
Current Orbit: 249.0000 km x 35786.0000 km x 5.9182 degrees;
Apogee Speed: 1602.0295 m/s; Perigee Speed: 10201.9274 m/s; delta v to this orbit: 8.6241


Second maneuver:
Perigee changed to 35786km
Inclination changed to 0 degrees
Current Orbit: 35786.0000 km x 35786.0000 km x 0.0000 degrees;
Apogee Speed: 3074.9218 m/s; Perigee Speed: 3074.9218 m/s; delta v to this orbit: 1499.2358


Total delta v to GEO: 1499.2358 m/s

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Here is the VA255 telemetry up until SECO, with interpolations for the periods not covered by the webcast.

It is interesting how low the acceleration of the second stage is, ranging from about 0.2 to 0.3g. This is only feasible because the second stage separates from the core stage at nearly 7km/s, which is just short of orbital velocity. As a result, gravity losses are minimal, and a low thrust, low mass, but high Isp engine is sufficient.

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Nice launch video



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VA-255 launch sticker

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Quote
Fully Operational SES-17 Starts Delivering Connectivity Services Across Americas

Very high throughput geostationary satellite will expand high-speed network capabilities and accelerate digitalisation in the region

Luxembourg, 16 June 2022 – SES announced today that its newest geostationary Ka-band satellite, SES-17, is now fully operational over the Americas, the Caribbean and the Atlantic Ocean at 67.1 degrees West. The all-electric propulsion satellite has reached orbit per schedule after months of in-orbit raising and successful in-orbit testing.

The very high throughput SES-17 satellite built by Thales Alenia Space is ready to provide unparalleled connectivity services to customers across aeronautical, maritime, enterprise, and government markets whether on land, at sea, or in the skies.  SES-17 anchor partner, Thales InFlyt Experience, will leverage SES-17 for FlytLive, a next-generation aviation connectivity solution enhancing Wi-Fi experiences onboard commercial aircraft across the Americas and the Caribbean. Moreover, key enterprise customers in Brazil, Argentina, Colombia, Mexico, Canada, including SSi Canada and COMNET, will now expand the reach and capability of their broadband networks to more remote areas.

With a fully digital payload powered by the most powerful digital transponder processor in orbit, an unmatched flexibility and nearly 200 user beams, SES-17 marks not only a significant development in satellite technology, but also is a first step in the integration of SES’s multi-orbit network. The spacecraft’s digital payload is supported by the Adaptive Resource Control (ARC) software, making it interoperable with SES’s second-generation O3b mPOWER satellite communications system in medium Earth orbit (MEO), set to launch in the coming months.

“We are excited to have the highly-anticipated SES-17 satellite start delivering services, while redefining and transforming the digital landscape for many different applications across the Americas and ultimately bringing high-speed connectivity to people wherever they are,” said Ruy Pinto, Chief Technology Officer at SES. “At SES, we are extremely thankful to our partners at Thales Alenia Space and Arianespace that have shared our vision at each step of SES-17’s journey to orbit.”

SES-17 was successfully launched onboard an Ariane 5 launcher operated by Arianespace from Europe’s Spaceport in Kourou, French Guiana on 23 October 2021 at 11:10 pm local time (02:10 am UTC). SES-17 is the 37th SES satellite launched by Arianespace and the 30th built by Thales Alenia Space, joining the current SES satellite network of 70 satellites.

https://www.ses.com/press-release/fully-operational-ses-17-starts-delivering-connectivity-services-across-americas
« Last Edit: 06/16/2022 10:10 am by GWR64 »

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Propulsion on SES-17: 4x SPT-140 plasma thruster, Fakel Kaliningrad

https://www.ses.com/sites/default/files/2021-09/SES_17_Factsheet_Sept_EN_Final.pdf

_______

Safran PPS®5000 on Syracuse-4A

Quote
Developed with support from the French and European space agencies, CNES and ESA, the PPS®5000 was fully qualified in June 2021 after logging more than 13,000 hours of full-power firing under vacuum conditions, corresponding to the over projected lifespan of these electric thrusters for a 15-year mission in geostationary orbit. In October 2021, the PPS®5000 performed its maiden flight by propelling the SYRACUSE IV mission, French military communications satellites supplied by Thales Alenia Space. The satellite will reach orbital position in 6 months relying on PPS®5000 multiple capacities.

https://www.safran-group.com/pressroom/safran-ppsr5000-plasma-thruster-chosen-new-galileo-satellites-2022-01-26

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Innovative data satellite enters commercial service

Quote
A large data-driven telecommunications satellite that uses innovative technology to keep cool as well as other innovations – developed under an ESA Partnership Project – has started its commercial service.

The satellite will provide broadband connectivity for commercial shipping, aviation, governments and enterprises through its operator, SES, as well connecting underserved areas and accelerating digital inclusion.

Called SES-17, it was launched on 23 October 2021 and spent the next six months navigating into geostationary orbit.

The very high throughput SES-17 belongs to a new generation of data intensive satellites and, with its new fifth-generation digital transparent processor, is able to deliver up to ten times more capacity than traditional satellites with unmatched flexibility and efficiency.

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Regarding Syracuse-4A:
CNES writes in the Annual Report 2021 <snip>
I do not know why the report is published on August 24, 2022 and how up-to-date this information is.
https://www.calameo.com/read/0000156394077c3bf4319
Page 36:
Quote
...the satellite achieved geostationary orbit over the next seven months, propelled by its four PPS®5000 electric thrusters (see page 41).
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