Artemis is a geostationary earth orbit satellite (GEOS) for telecommunications, built for ESA. The Artemis satellite operates at the 21.5E orbital position.[1]
The mission was planned for many years, with launch initially intended for 1995 and slipping; it was intended for launch on Ariane 5 but at one point there were suggestions that a Japanese H-II rocket might be used.[2]
Launched by an Ariane 5 rocket on 12 July 2001, it originally reached an orbit much lower than planned (590 km x 17487 km) due to a malfunction in the launch vehicle's upper stage.[3] It was remotely reconfigured to reach its intended station by means of a novel procedure.[4] First, over the course of about a week, most of its chemical fuel was used to put it in a 31,000 km circular orbit (by raising first the apogee then the perigee, going via a 590 km x 31000 km orbit). Then, its electric-ion motor — originally intended for station keeping and for firing a few minutes at a time — was instead kept running for most of 18 months, pushing the spacecraft into an outward spiral trajectory. It gained altitude at the rate of about 15 km per day, until it reached the intended geostationary orbit.[5]
On January 1, 2014 Avanti, a London-based company, took the ownership of the satellite.[6]
Payload
The Artemis satellite has several payloads [7]
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SILEX (Semiconductor-laser Intersatellite Link Experiment) is a laser link, which has been used both to communicate with the SPOT-4 remote-sensing satellite and with a plane in flight.[8] It uses a 60 mW AlGaAs laser diode as the transmitter and a photodiode detector, with a 25 cm telescope aperture, and a data rate of 50Mbit/s; it weighs about 160 kg and uses 150 watts of power.[9] The telescope is in a fork mounting. The system is designed and built by Astrium.
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SKDR (S/Ka band Data Relay), a system for relaying data from other satellites. This uses a 2.85-metre antenna.
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LLM (L-band Land Mobile), a system designed for satellite communication with fairly small vehicle-based terminals in Europe. This uses a second 2.85-metre antenna, providing four beams; one covers Europe from western Spain to eastern Turkey and from the southern point of Tunisia to the north of Norway, whilst three spot beams cover respectively France and Spain; central Europe and Italy; Turkey and south-East Europe.
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An advanced ion propulsion system with 44 kg of xenon reaction mass
Operations
Artemis is used operationally for data relay from ESA's satellites in low Earth orbit; a SILEX link to SPOT-4 is established daily.[11] It can also be used on an emergency basis; for example, it was used to relay information from the automated transfer vehicle Jules Verne while mission control at Houston was unavailable due to a hurricane.[12]
It is now considered a precursor for the EDRS programme.
References
External links
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Artemis news page at European Space Agency
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Images of the Artemis satellite
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EDRS SpaceDataHighway
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Facilities
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Communications
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Programmes
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Predecessors
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Related topics
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Science
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Solar physics
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Planetary science
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Earth observation
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Telecommunications
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Technology
demonstrators
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Cancelled and proposed
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Failed
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Future missions in italics
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Payloads are separated by bullets ( · ), launches by pipes ( | ). Manned flights are indicated in bold text. Uncatalogued launch failures are listed in italics. Payloads deployed from other spacecraft are denoted in brackets.
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