Orbiter pic-essay Part II: Ariane 5 EC-B (56k Alert)

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Orbiter pic-essay Part II: Ariane 5 EC-B (56k Alert)

Post by Ma Deuce »

To commorate the recent successful launch of the Ariane 5 EC-A, here's another pic-essay, only the launcher here is the future Ariane 5 EC-B, which is basically the same as the EC-A, but with a stretched upper stage for greater fuel capacity, which will allow it to carry 20% more weight to a geostationary transfer orbit.

The cargo for this mission is a (also unbuilt in RL) Carina orbital payload capsule mounted on a Russian-designed Fregat orital thrust module (the Fregat is currently used on the Russian R-7 launchers that also make use of the ESA's Kourou spaceport where the Ariane 5s launch, but as yet hasn't been used on Ariane) mounted on an adaptor cradle: the Fregat-Carina assembly will be released on a test flight in low earth orbit (LEO). The other piece of cargo is a meteorlogical satellite destined for a geostationary orbit. The two payloads can be carried simultaniously through the use of a Sylda 1500 internal payload structure.

1) The Ariane 5 launcher on the pad at the ESA's spaceport at Kourou, French Guiana: Kourou is situated very near the equator, making it a perfect site to launch payloads into a geostationary orbit.
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2)Liftoff!
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3)T + 100 seconds, altitude 30,000m
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4)T + 123 seconds: the spent Solid Rocket Boosters (SRBs) have jettisoned: The SRBs provided most of the thrust up to this point. The Core stage will continue it's burn until it is exhausted.
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5)Fairing jettison...
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6)A better view of the passenger Carina/Fregat assembly, as well as the Sylda payload structure it sits on: the meteorological sat is inside the Sylda.
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7)Core stage jettison & upper stage ignition.
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8)The upper stage, laden with 9 tonnes of deadweight, must burn nearly half it's fuel to achieve a proper orbit.
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9)Upper stage shutdown, altitude 310km: The orbit is only slighly inclined off the equator.
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10)The Fregat/Carina combo (which together weigh 7 tonnes) is released.
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11)The Fregat begins a long burn, which will put it in higher-inclination orbit at the same altitude.
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12)Fregat shutdown...
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13)Now, back to the Ariane upper stage: The Sylda structure has jettisoned, revealing the meteorlogical sat. The Geostationary transfer burn will begin as soon as as the upper stage reaches the Ascending Node of it's orbit...
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14)The upper stage begins a burn to put it into a geostationary transfer orbit. Image

15)The upper stage is now in it's GTO coast phase, which lasts about 6 hours.
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16)Now at the apogee of it's GTO, the third stage ignites again to adjust it's GTO into a circular geostationary orbit over the Americas.
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17)With the burn complete, the satellite is released: it's geostationary orbit will perpetually keep it directly over the same point on the earth's surface.
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18)Since the satellite's mass was well below the upper stage's GEO payload limit, it has enough fuel left to de-orbit itself, so it initiates a final burn to do so: If it didn't have enough fuel, it'd simply adjust it's orbit to minimize the chance of contact with another satellite.
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19)The upper stage is only 1,200km from the Earth's surface, and is now free-falling at nearly 36,000 km/h: it will re-enter the atmosphere over the central Pacific.
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20)Re-entry and burnup: total flight time was just over 13 hours.
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