Drugi start Ariane w tym roku 20.06. o 21:43 z Kourou wystrzelona została RN Ariane-5ECA, która wyniosła w T+25' 02" na orbitę o parametrach:
hp=250 km, ha=35756 km, i=6° satelity telekomunikacyjne AT&T T-16 (DirecTV) 16 i Eutelsat 7C.
http://lk.astronautilus.pl/n190616.htm#01Udany start Ariane 5 (20.06.2019) BY KRZYSZTOF KANAWKA ON 23 CZERWCA 2019
Start Ariane 5 - 20.06.2019 / Credits - ArianespaceDwudziestego czerwca nastąpił udany start rakiety Ariane 5 z dwoma satelitami telekomunikacyjnymi.
Do startu rakiety Ariane 5 doszło 20 czerwca 2019 o godzinie 23:43 CEST. Start nastąpił z kosmodromu Kourou w Gujanie Francuskiej. Na pokładzie rakiety Ariane 5 znalazły się dwa satelity telekomunikacyjne:
- T-16, zbudowany przez koncern Airbus. Masa startowa tego satelity to 6330 kg. Satelita ma funkcjonować na orbicie geostacjonarnej minimum 15 lat. Jest to pięćdziesiąty satelita zbudowany na platformie Eurostar E3000.
- Eutelsat 7C, zbudowany przez firmę Maxar. Masa startowa tego satelity to 3405 kg. Podobnie jak T-16, ten satelita także powinien operować na orbicie geostacjonarnej przez minimum 15 lat.
Oba satelity zostały skierowane na orbitę geostacjonarną transferową (GTO), skąd “o własnych siłach” dotrą do wyznaczonych punktów na orbicie geostacjonarnej (GEO) w ciągu kilku tygodni.
Lot rakiety Ariane 5 przebiegł prawidłowo. Wszystkie loty
od czasu częściowo nieudanego startu tej rakiety ze stycznia 2018 przebiegły bez żadnych problemów. Jest to ważne dla przyszłych misji –
Ariane 5 ma wynieść kosmiczny teleskop JWST, który ma minimalne możliwości manewrowania w pierwszym etapie lotu w przestrzeni kosmicznej. Loty z 2018 i 2019 roku wyraźnie wskazują, że błędy z częściowo nieudanego startu Ariane 5 zostały już w całości rozwiązane.
(PFA)
https://kosmonauta.net/2019/06/udany-start-ariane-5-20-06-2019/Ariane 5 lofts satellites for AT&T, Eutelsatby Caleb Henry — June 20, 2019
Arianespace's VA248 mission launched the Eutelsat-7C and T-16 satellites June 20 aboard an Ariane 5. Credit: Arianespace webcast.SANTA BARBARA, California — A European Ariane 5 rocket successfully launched two communications satellites June 20.
The heavy lift launcher took off from Europe’s spaceport in Kourou, French Guiana, at 5:43 p.m. Eastern, carrying the T-16 satellite for AT&T’s DirecTV business, and the Eutelsat-7C satellite for French operator Eutelsat Communications.
The 6,330-kilogram T-16 satellite, built by Airbus Defence and Space, separated from the rocket’s upper stage 28 minutes later, followed by the 3,400-kilogram Eutelsat-7C satellite from Maxar Technologies 34 minutes after liftoff.
The launch is the fifth this year for European launch provider Arianespace of Evry, France, and the second in 2019 using an Ariane 5 rocket. Arianespace is roughly a year away from the maiden flight of the next-generation Ariane 6, which is designed to be more cost competitive against vehicles such as SpaceX’s Falcon 9.
AT&T’s T-16 satellite is designed to operate from five different orbital slots, and will cover the United States. The satellite’s launch comes some seven months after AT&T Communications CEO John Donovan said the company
had already launched its last satellite.
In a statement to
SpaceNews, AT&T said T-16 is the last satellite currently planned.
“This new satellite will replace several satellites that are reaching end of life,” AT&T said. “We currently have no future planned satellite launches.”
AT&T has been increasing its focus on internet streaming services as its satellite television subscriber base wanes. The company reported a loss of 544,000 “premium TV subscribers” from January to March 31, lowering the total count to 22.4 million.
For Eutelsat, today’s launch brings additional capacity to Africa, Europe and the Middle East for a mix of television broadcast and internet connectivity services. Eutelsat, which operates a fleet of roughly 40 satellites, plans to co-locate Eutelsat-7C with the Eutelsat-7B satellite at the 7 degrees east orbital slot. The company will then move Eutelsat-7A to another location as part of its fleet optimization strategy.
Eutelsat-7C carries 44 Ku-band transponders, replacing capacity from Eutelsat-7A and expanding coverage at 7 degrees east by 19 transponders.
Eutelsat-7C is the first all-electric satellite from Maxar Technologies. The spacecraft will take close to four months to climb from a geostationary transfer orbit to the geostationary arc 36,000 kilometers above the Earth.
Maxar said in a statement that more than 30 spacecraft it built have used some form of electric propulsion, collectively topping 100,000 hours of thruster operation.
Electric propulsion requires less mass than chemical propulsion, but is a slower means of propelling a spacecraft. AT&T’s T-16 satellite from Airbus has chemical propulsion for faster orbit raising, coupled with electric propulsion for station keeping.
In a speech following the launch, Paul Estey, Maxar’s chief operations officer, said Eutelsat-7C is the first satellite to carry Maxar’s more powerful second-generation lithium-ion power generation system. The satellite also carries a photonics payload to demonstrate technology for more efficient payloads in the future, he said. Photonics payloads have the potential to reduce spacecraft mass compared to current radio-frequency systems.
Arianespace CEO Stéphane Israël said the launch provider’s next mission is July 5 using a Vega light-lift rocket. That mission will carry the first of two Falcon Eye surveillance satellites for the United Arab Emirates.
https://spacenews.com/ariane-5-lofts-satellites-for-att-eutelsat/Some statistics on today's flight:248th launch of an Ariane rocket since 1979
310th Arianespace mission
104th launch of an Ariane 5 rocket since 1996
71st launch of an Ariane 5 ECA rocket since 2002
79th flight of a Vulcain 2 engine
103rd flight of an HM7B engine
89th Ariane 5 launch targeting GTO
5th launch from the Guiana Space Center in 2019
2nd Ariane 5 launch in 2019
https://spaceflightnow.com/2019/06/20/ariane-5-va-248-mission-status-center/Two commercial broadcast satellites launched on Ariane 5 rocketJune 20, 2019 Stephen Clark
An Ariane 5 rocket takes off Thursday night with AT&T’s T-16 and the Eutelsat 7C commercial communications satellites. Credit: ESA/CNES/Arianespace – Photo Optique Video du CSG – S. Martin(...)T-16 is heading for an operating location over the Americas, while Eutelsat 7C’s coverage zone will include Europe, Africa, the Middle East and Turkey.
AT&T’s T-16 television broadcast satellite during ground testing. Credit: Airbus Defense and Space(...) But there are still plenty of customers subscribing to AT&T’s pay-TV offerings. As of the end of March, AT&T’s DirecTV and U-verse services had 22.4 million subscribers.
AT&T’s T-16 satellite is based on Airbus’s Eurostar 3000 LX spacecraft platform, with a conventional chemical orbit-raising engine and electric thrusters for station-keeping maneuvers. According to Arianespace’s press kit for Thursday’s launch, the T-16 spacecraft weighs 13,955 pounds (6,330 kilograms) fully fueled with propellants.
Designed for a 15-year lifetime, AT&T’s T-16 satellite carries Ku-band and Ka-band broadcast payloads to reach consumers in the continental United States, Alaska, Hawaii and Puerto Rico.
In a regulatory filing submitted to the Federal Communications Commission last month, AT&T asked regulators for authorization to park the T-16 satellite in geostationary orbit over the equator at 100.85 degrees west longitude, where the spacecraft will orbit the Earth at the same rate as the planet’s rotation.
AT&T said the T-16 satellite will be co-located with the T-4S, T-8 and T-9S broadcasting satellites at the 101 degrees west position. The new spacecraft will take over from the T-15 satellite, which launched in 2015.
Documents submitted to the FCC by AT&T indicate the T-15 satellite was moved last year from a location at 103 degrees west to 101 degrees. The T-15 satellite will leave the 101 degrees west location for another posting in geostationary orbit about a month after T-16 arrives at its operating post, according to the FCC filing.
AT&T did not respond to questions from Spaceflight Now on the T-16 satellite or the future of the company’s satellite broadcast service.
“T-16 is one of our most powerful direct to home broadcast satellites, with a record number of +180 high-power amplifiers,” said Jean-Marc Nasr, head of Airbus Space Systems, in a statement. “T-16 will be able to broadcast hundreds of UltraHD 4K video services to end customers spread across the USA.
“Our Eurostar satellites have already clocked up more than 800 cumulative years of operational service in orbit,” Nasr said. “This is a true double success for us — as we also celebrate the 104th launch of the Ariane 5.”
“The job is not over,” said Aziz Bouhia, vice president and head of Airbus’s telecom satellites program. “Our team back in Toulouse is working … to raise T-16 into its final orbital slot and to do all the in-orbit testing during the summer, and then the spacecraft will be fully operational at the end of August.”
The 7,500-pound (3,400-kilogram) Eutelsat 7C satellite is destined for an operating post in geostationary orbit at 7 degrees east longitude. Eutelsat 7C’s coverage zone will include Africa, Europe, the Middle East and Turkey.
Artist’s concept of the Eutelsat 7C satellite in orbit. Credit: MaxarParis-based Eutelsat says the new satellite hosts more than 40 Ku-band transponders to serve video and data markets. Eutelsat 7C will be co-located with Eutelsat 7B at the 7 degrees east position, and the aging Eutelsat 7A satellite — launched in 2004 — will fly to another location in geostationary orbit, according to Eutelsat.
“This satellite will be located at 7 degrees east, one our most dynamic video neighborhoods, which already broadcasts 500 channels and serves key customers such as Digiturk in turkey, AzamTV in Tanzania and Muvi TV in Zambia,” said Yohann Leroy, deputy CEO and chief technical officer of Paris-based Eutelsat. “We look forward to putting it into service to continue building the momentum at this orbital location.”
“By significantly increasing capacity over sub-Saharan Africa, Eutelsat 7C will have room for several hundred additional digital channels to support the region’s fast expanding TV market,” Eutelsat wrote on its website. “It will also be equipped with a beam providing enhanced capacity for government services over Europe, the Middle East and Central Asia, as well as a steerable beam that can cover any region visible from 7 degrees east.”
Eutelsat 7C is Maxar’s first satellite with an all-electric propulsion system. The low-thrust, high-efficiency plasma thrusters consume less propellant than conventional chemical rocket engines, allowing Eutelsat 7C to carry a lighter fuel load and giving Eutelsat access to a cheaper launch opportunity.
“All-electric satellites provide efficient solutions for satellite operators by reducing launch mass while increasing spacecraft flexility and performance,” said Arlen Kasighian, the satellite mission manager at Eutelsat. “Eutelsat has been a pioneer in all-electric platforms since 2015, collaborating with many major satellite providers.” (...)
https://spaceflightnow.com/2019/06/20/two-commercial-broadcast-satellites-launched-on-ariane-5-rocket/https://spaceflightnow.com/2019/06/19/ariane-5-rocket-arrives-at-launch-pad-with-two-tv-broadcast-satellites/http://www.arianespace.com/mission/ariane-flight-va248/#https://www.nasaspaceflight.com/2019/06/ariane-5-att-t-16-eutelsat-7c/https://space.skyrocket.de/doc_sdat/directv-16.htmhttps://space.skyrocket.de/doc_sdat/eutelsat-7c.htm
Wątek: Starty rakiet (II kwartał 2019 roku) (Przeczytany 34946 razy)