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Arabsat 5A & Coms SATELLITE LAUNCHES FOR THE MIDDLE EAST AND SOUTH KOREA For its second launch of the year, Arianespace will orbit the Arabsat 5A communications satellite for operator Arabsat, and the COMS multi-mission satellite for the Korea Aerospace Research Institute (KARI). The choice of Arianespace by leading operators and manufacturers is clear international recognition of the company’s excellence in launch services. Based on the proven reliability and availability of its launch services, Arianespace continues to confirm its position as the world’s benchmark launch system. Ariane 5 is the only commercial satellite launcher now on the market capable of simultaneously launching two payloads. Arianespace and Arabsat have developed close ties over the 25 years since the launch of Arabsat 1A in 1985. Arabsat 5A is the seventh Arabsat satellite to be orbited by the European launcher. Arabsat 5A was built by Astrium and Thales Alenia Space within the scope of a turnkey contract with satcom operator Arabsat, based in Riyadh, Saudi Arabia. Astrium provides the Eurostar 3000 platform and is responsible for satellite integration, while Thales Alenia Space supplies the payload. The fifth-generation Arabsat 5A will provide telecommunications and TV broadcasting services in the Middle East and North Africa. Positioned at 30.5 degrees East, Arabsat 5A has a design life exceeding 15 years. The launch of South Korea’s COMS satellite carries on a collaboration that started with the launch of the scientific microsats Kitsat A and Kitsat B for SATREC, Satellite Technology Research Center, and continued with the launch of the Koreasat 3 communications satellite for the operator Korea Telecom. COMS, the Communication, Ocean and Meteorological Satellite, will weigh about 2,460 kg at launch. It is fitted with three payloads to carry out meteorological observation, ocean surveillance and experimental broadband multimedia communications services, based on its orbital position. Program prime contractor Astrium built COMS using a Eurostar 3000 platform, fitted with a meteorological imaging system and an ocean observation payload. The communication payload was supplied by ETRI (Electronics and Telecommunications Research Institute) in Korea. 1 - The ARIANESPACE mission 2 - Range operations campaign: ARIANE 5 3 - Launch countdown and flight events 4 - Flight Trajectory 5 - The ARIANE 5 launch vehicle 6 - The ARABSAT 5A satellite 7 - The COMS satellite Appendix 1. Flight Key personnel 2. Launch environment conditions 3. Synchronized sequence 4. ARIANESPACE, its relations wich ESA and CNES Follow the launch live on the internet broadband at www.arianespace.com 1 (starting 20 minutes before lift-off) 1. Mission profile The 195th Ariane mission will place two satellites into geostationary transfer orbit: the Arabsat 5A communications satellite for operator Arabsat, and the COMS multi-mission satellite for the Korea Aerospace Research Institute (KARI). This will be the 51st Ariane 5 launch The launcher will be carrying a total payload of 8,393 kg, including 7,315 kg for the Arabsat 5A and COMS satellites, which will be released into their targeted orbits. The launch will be from Ariane Launch Complex No. 3 (ELA 3) in Kourou, French Guiana. Injection orbit Perigee altitude 250 km Apogee altitude 35,786 km at injection Inclination 2° degrees The lift-off is scheduled on the night of 23 to 24 June, 2010 as soon as possible within the following launch window: Launch opportunity Universal time (GMT) Paris time Kourou time Riyadh time Seoul time Between 9:41 pm 11:41 pm 6:41 pm 12:41 am 6:41 am and 10:45 pm 12:45 am 7:45 pm 13:45 am 7:45 am on June 23, 2010 June 23/24, 2010 June 23, 2010 June 24, 2010 June 24, 2010 Configuration of Ariane payload The Arabsat 5A satellite was built by Astrium and Thales Alenia Space, in Toulouse and Cannes, France, for the operator Arabsat. Orbital position: 30.5° East COMS was built by Astrium and the Korea Aerospace Research Institute (KARI). Orbital position : 128,2° East For more information, visit us on www.arianespace.com 2 2. Range operations campaign: ARIANE 5 - ARABSAT 5A & COMS Satellites and launch vehicle campaign calendar Ariane activities Dates Satellites activities Campaign start review March 1st, 2010 EPC Erection March 1st, 2010 EAP transfer and positionning March 2, 2010 Integration EPC/EAP March 3, 2010 ESC-A and VEB Erection March 10, 2010 March 11, 2010 Arrival in Kourou of ARABSAT 5A and beginning of preparation campaign in building S5 C March 11, 2010 Arrival in Kourou of COMS and beginning of preparation campaign in building S5 C May 26-31, 2010 ARABSAT 5A filling operations in S5 A building Roll-out from BIL to BAF June 2, 2010 June 2, 2010 ARABSAT 5A integration on adaptor (ACU) June 5-8, 2010 COMS filling operations in S5 B building Satellites and launch vehicle campaign final calendar J-10 Wednesday, June 9 ARABSAT 5A transfer to Final Assembly Building (BAF) J-9 Thursday, June 10 ARABSAT 5A integration on Sylda and COMS integration on adaptor J-8 Friday, June 11 Fairing integration on Sylda - COMS transfer to Final Assembly Building (BAF) J-7 Monday, June 14 COMS integration on launcher J-6 Tuesday, June 15 Upper composite integration with ARABSAT 5A on launcher J-5 Wednesday, June 16 ESC-A final preparations and payloads control J-4 Thursday, June 17 Launch rehearsal J-3 Friday, June 18 Arming of launch vehicle J-2 Monday, June 21 Arming of launch vehicle Launch readiness review (RAL) and final preparation of launcher J-1 Thursday, June 22 Roll-out from BAF to Launch Area (ZL), launch vehicle connections and filling of the EPC liquid Helium sphere J-0 Wednesday, June 23 Launch countdown including EPC and ESC-A filling with liquid oxygen and liquid hydrogen For more information, visit us on www.arianespace.com 3 3. Launch countdown and flight events The countdown comprises all final preparation steps for the launcher, the satellites and the launch site. If it proceeds as planned, the countdown leads to the ignition of the main stage engine, then the two boosters, for a liftoff at the targeted time, as early as possible in the satellites launch window. The countdown culminates in a synchronized sequence (see appendix 3), which is managed by the control station and onboard computers starting at T-7 minutes. If an interruption in the countdown means that T-0 falls outside the launch window, then the launch will be delayed by one, two or more days, depending on the problem involved, and the solution developed. Time Events – 11 h 30 mn Start of final countdown – 7 h 30 mn Check of electrical systems – 4 h 50 mn Start of filling of main cryogenic stage with liquid oxygen and hydrogen – 3 h 20 mn Chilldown of Vulcain main stage engine – 1 h 10 mn Check of connections between launcher and telemetry, tracking and command systems – 7 mn 00 s “All systems go” report, allowing start of synchronized sequence – 4 mn 00 s Tanks pressurized for flight – 1 mn 00 s Switch to onboard power mode - 05,5 s Command issued for opening of cryogenic arms – 04 s Onboard systems take over – 03 s Unlocking of guidance systems to flight mode HO Ignition of the cryogenic main stage engine (EPC) ALT (km) V. rel. (m/s) + 7,05 s Ignition of solid boosters 0 0 + 7,3 s Liftoff 0 0 + 12,5 s End of vertical climb and beginning of pitch rotation (10 seconds duration) 0.090 37.5 + 17 s Beginning of roll manoeuvre 0.345 76.6 + 2 mn 20 s Jettisoning of solid boosters 67.9 1997 + 3 mn 09 s Jettisoning of fairing 107.7 2184 + 7 mn 31 s Acquisition by Natal tracking station 210.0 4904 + 8 mn 55 s Shut-down of main cryogenic stage 210.7 6831 + 9 mn 01 s Separation of main cryogenic stage 210.4 6858 + 9 mn 05 s Ignition of upper cryogenic stage (ESC-A) 210.1 6861 + 13 mn 30 s Acquisition by Ascension tracking station 180.3 7557 + 18 mn 28 s Acquisition by Libreville tracking station 199.3 8381 + 23 mn 15 s Acquisition by Malindi tracking station 434.8 9174 + 24 mn 40 s Shut-down of ESC-A / Injection 581.8 9416 + 26 mn 39 s Separation of ARABSAT 5A satellite 852.0 9187 + 30 mn 11 s Separation of Sylda 5 1485.7 8692 + 32 mn 38 s Separation of COMS satellite 2006.2 8325 + 49 mn 52 s End of Arianespace Flight mission 6318.8 6118 For more information, visit us on www.arianespace.com 4 4. Flight trajectory of ARABSAT 5A & COMS The launcher’s attitude and trajectory are totally controlled by the two onboard computers, located in the Ariane 5 vehicle equipment bay (VEB). 7.05 seconds after ignition of the main stage cryogenic engine at T-0, the two solid-propellant boosters are ignited, enabling liftoff. The launcher first climbs vertically for 6 seconds, then rotates towards the East. It maintains an attitude that ensures the axis of the launcher remains parallel to its velocity vector, in order to minimize aerodynamic loads throughout the entire atmospheric phase, until the solid boosters are jettisoned. Once this first part of the flight is completed, the onboard computers optimize the trajectory in real time, minimizing propellant consumption to bring the launcher first to the intermediate orbit targeted at the end of the main stage propulsion phase, and then the final orbit at the end of the flight of the cryogenic upper stage. The main stage falls back off the coast of Africa in the Atlantic Ocean (in the Gulf of Guinea).
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