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Ariane 5

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Placed by: KJ van Til on 03-07-11 14:00 | E-mail: info(at)drra.nl
Posted: Sat, Jul 2, 1:12 PM ET (17:12 GMT)
Ariane 5 launch scrubbed

A technical problem scrubbed Friday evening's scheduled launch of two communications satellites on an Ariane 5, delaying the launch until late this month.
The rocket was set to lift off at 5:43 pm EDT (2143 GMT) Friday from Kourou, French Guiana, but the countdown was halted a few minutes before launch, and the launch attempt was later scrubbed. Officials blamed the scrub on a liquid hydrogen valve in the rocket's core booster that did not properly close.
Arianespace announced Saturday that the launch would be postponed by approximately 20 days in order to replace the valve. The rocket is carrying the Astra 1N communications satellite, built by EADS Astrium for SES, and the BSAT-3c/JCSAT-110R communications satellite, built by Lockheed Martin for Japanese companies B-SAT and Sky Perfect JSAT.
Bron: Spacetoday
Ariane launched | Reaction of: KJ on 07-08-11 18:51 | E-mail: info(at)drra.nl
Ariane leaves troubles behind with good launch
Posted: August 6, 2011

Loaded with European and Japanese television broadcasting satellites, an Ariane 5 rocket blasted off in a ball of fire Saturday from the South American jungle and successfully deployed both payloads less than an hour later.

The 165-foot-tall rocket ignited its hydrogen-fueled main engine at 2252 GMT (6:52 p.m. EDT), then roared skyward seven seconds later when the launcher fired its twin solid rocket boosters. Liftoff occurred after dusk at the launch site in Kourou, French Guiana.

Arianespace, the French company overseeing the launch, postponed the mission from July 1 to replace a hydrogen valve in the rocket's first stage. An anomaly with the valve scrubbed the flight's first launch attempt.

Unfavorable upper level winds delayed the launch about one hour Saturday.

The rocket's second stage injected both payloads in the planned oval-shaped elliptical geosynchronous transfer orbit, then released the satellites a few minutes later.

The 11,750-pound ASTRA 1N spacecraft, a satellite for European operator SES ASTRA, separated first about 27 minutes after liftoff. The Ariane 5 rocket's upper stage deployed Japan's 6,415-pound BSAT 3c/JCSAT 110R satellite 38 minutes into the flight.

Arianespace declared the launch a success, marking the Ariane's 45th straight flawless flight since 2002. The rocket's customers include commercial satellite operators, European goverments and institutions, and the International Space Station.

ASTRA 1N will be initially positioned in geosynchronous orbit at 28.2 degrees east longitude to serve the United Kingdom and Ireland. Then the satellite will move to a permanent location at 19.2 degrees east for the bulk of its 15-year service life.

From its second position, ASTRA 1N will provide direct-to-home digital and high-definition television broadcasting to Germany, France and Spain, according to SES ASTRA, the craft's operator based in Luxembourg.

The spacecraft's communications payload features 52 active Ku-band transponders. Its solar panels will stretch more than 130 feet across when fully extended in orbit.

Astrium manufactured the ASTRA 1N satellite based on the company's Eurostar E3000 spacecraft bus. The satellite is designed to generate at least 13 kilowatts of power at the end of its service life.

The BSAT 3c/JCSAT 110R satellite, a Japanese craft jointly owned by two companies, rode the Ariane 5 rocket in the lower position inside the vehicle's nose cone.

The spacecraft is designed for a 15-year tandem mission for two Japanese communications firms. Known as BSAT 3b and JCSAT 110R, the satellite was built by Lockheed Martin Corp. based on the A2011A platform.

Broadcasting Satellite System Corp., or B-SAT, and SKY Perfect JSAT Corp. will use the BSAT 3b/JCSAT 110R spacecraft on separate missions. Both companies are based in Tokyo.

B-SAT will use the spacecraft for a television broadcasting mission. B-SAT's largest shareholder is the Japanese broadcaster NHK.

The rest of the craft's capacity will be managed by SKY Perfect JSAT for other telecommunications services, including direct digital television programming.

The BSAT 3b/JCSAT 110R satellite is heading for an operational position in geosynchronous orbit along the equator at 110 degrees east longitude. It carries 24 Ku-band transponders split between its two operators.

Arianespace's next launch is set for early September with the Arabsat 5C and SES 2 commercial communications satellites.
Bron: Spaceflight Now
Ariane 5. Fourth launch this year | Reaction of: DRRA-KJvTil on 02-09-16 15:33 | E-mail: info(at)drra.nl
25 August 2016

An Ariane 5, operated by Arianespace, has delivered two telecom satellites, Intelsat-33e and Intelsat-36, into their planned orbits.

Liftoff of flight VA232 occurred on 24 August at 22:16 GMT (19:16 local time, 00:16 CEST on 25 August) from Europe’s Spaceport in Kourou, French Guiana.

Intelsat-33e, with a mass at liftoff of 6600 kg and mounted in the upper position atop Ariane’s Sylda dual-payload carrier inside the fairing, was the first to be released about 28 minutes into the mission.

Following a series of burns controlled by Ariane’s onboard computer, the Sylda structure encasing the 3253 kg Intelsat-36 was then jettisoned. Intelsat-36 was released into its own transfer orbit about 13 minutes after the first satellite.

The payload mass for this launch was 10 735 kg. The satellites totalled about 9853 kg, with payload adapters and carrying structures making up the rest.

Both satellites have a design life of 15 years and are owned by satellite operator Intelsat.

Flight VA232 was the 87th Ariane 5 mission.
Ariane 5 returns to flight | Reaction of: DRRA-KJvTil on 07-04-18 11:31 | E-mail: info(at)drra.nl
Ariane 5 to return with DSN-1/Superbird-8 and HYLAS 4

Following a launch pause of over two months, Ariane 5 will return to action on Thursday with the launch of DSN-1/Superbird-8 and HYLAS 4. Liftoff from the European Spaceport in Kourou, French Guiana is scheduled within a 50 minute launch window that opens at 21:34 UTC.

In what is set to be the second Ariane 5 launch of the year, Arianespace was originally set to launch this mission last month.
There has been no official word on the reason for the halt into April, with the only news coming from one of the passengers for this latest mission.

Avanti Communications Group plc (Avanti) has been advised by Arianespace of a halt to the launch of its HYLAS 4 satellite (HYLAS 4), which will not have a material effect on the HYLAS 4 in-service date, per a press release. Avanti anticipates a revised launch date in early April and expects to be able to acknowledge a fixed launch date shortly.

That date was set for April 5.

A potential cause of the secrecy relating to the launch date change could be due to the resolutions taking place after the first Ariane 5 launch of the year.

That launch lofted SES-14 and Al Yah-3. However, despite concerns the two passengers had been lost due to the lack of telemetry during the bulk of the upper stage flight, both satellites did deploy. While there has been no word on SES-14’s status, Al Yah-3’s owners are understood to be making an insurance claim.

The issue – as noted by an Independent Enquiry Commission – was caused by an incorrect value in specifications for the implementation of the launcher’s two inertial reference systems. As such, this issue was likely caused by human error.

Given the special requirements of this mission, the azimuth required for the alignment of the inertial units was 70 degrees instead of 90 degrees, as is most often the case for missions to geostationary transfer orbit. This gap led to the 20-degree shift to the south in the launcher trajectory from the initial seconds of flight, added the investigation report.

The misdelivered Ariane payloads continue heading to GEO. SES-14, using electric propulsion, is climbing steadily while the chem prop on AY3 makes big burns.
— Jonathan McDowell (@planet4589) February 23, 2018

The cause of the trajectory deviation, therefore, was due to a bad specification of one of the launcher mission parameters that was not detected during the standard quality checks carried out during the Ariane 5 launches’ preparation chain.

The action plan to mitigate such an issue in the future included the strengthening of the processes for establishing, verifying and approving the specific operational procedures involving the IMU reference frame.

Recommendations to improve processes and quality control have been made. Furthermore, additional recommendations to enhance end-to-end verifications of mission-specific parameters used during the launch campaign were made, added an ESA release after the investigation’s findings.
Ariane 5 second launch of 2018 | Reaction of: DRRA-KJvTil on 07-04-18 12:47 | E-mail: info(at)drra.nl
6 April 2018

An Ariane 5, operated by Arianespace, has delivered the DSN-1/Superbird-8 and Hylas-4 telecom satellites into their planned orbits.

Liftoff was announced at 21:34 GMT (23:34 CEST, 18:34 local time) yesterday from Europe’s Spaceport in Kourou, French Guiana. The mission lasted about 33 minutes.

DSN-1/Superbird-8, with a launch mass of 5348 kg, was moved into position for release after about 25 minutes. The 4050 kg Hylas-4 was released 33 minutes after liftoff.
DSN-1/Superbird-8, operated by Sky Perfect JSAT, will provide communications services for Japan. The satellite has a design life of more than 15 years.
Hylas-4, owned and operated by Avanti, provides broadband and connectivity services to Africa and Europe. The satellite has a design life of 15 years.

The performance requested for this launch was about 10 260 kg. The satellites totalled about 9398 kg, with payload adapters and support structures making up the rest.

Flight VA242 was the 98th Ariane 5 mission.
www.youtube.com/watch?v=VDEQ4U89zzU


De Vulcain-2 raket motor, gebruikt als core motor van de Ariane 5.

KJ:
De boosterraketten leveren 90% van de stuwkracht tijdens de stuwfase.
Er wordt tijdens de stuwfase 5 ton brandstof per seconde verbrand in de boosters, 2.5 ton per boosterraket. De core Vulcain-motor, de middelste, maar dus niet de sterkste, verbrand nog eens 300 Kg per seconde.
De 240 ton brandstof per boosterraket wordt er in 2 minuten doorheen geperst!
De enorme stuwkracht die wordt gegenereerd is ook wel nodig om de 774 ton startgewicht omhoog te krijgen.
Na 90 seconden is de bereikte hoogte al 25 Km en de snelheid ruim 1 Km per seconde! Verbijsterende getallen toch?

Afstoten van de boosters:




 
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