Artemis was a
geostationary earth orbit satellite (GEOS) for telecommunications, built by Alenia Spazio for
ESA
, owners =
, headquarters = Paris, Île-de-France, France
, coordinates =
, spaceport = Guiana Space Centre
, seal = File:ESA emblem seal.png
, seal_size = 130px
, image = Views in the Main Control Room (120 ...
. The Artemis satellite operated at the 21.5E orbital position
until 2016, when it was moved to 123E to cover the L-Band spectrum rights for Indonesia's Ministry of Defense.
In November 2017, Artemis was retired and replaced to a
graveyard orbit
A graveyard orbit, also called a junk orbit or disposal orbit, is an orbit that lies away from common operational orbits. One significant graveyard orbit is a supersynchronous orbit well beyond geosynchronous orbit. Some satellites are moved into ...
.
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.
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. It was remotely reconfigured to reach its intended station by means of a novel procedure. 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 RIT-10
gridded ion thruster
The gridded ion thruster is a common design for ion thrusters, a highly efficient low-thrust spacecraft propulsion method running on electrical power by using high-voltage grid electrodes to accelerate ions with electrostatic forces.
History
The ...
— 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.
On January 1, 2014, Avanti, a London-based company, took the ownership of the satellite.
Payload
The Artemis satellite has several payloads
* 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. 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. The telescope is in a
fork mounting
An equatorial mount is a mount for instruments that compensates for Earth's rotation by having one rotational axis, the polar axis, parallel to the Earth's axis of rotation. This type of mount is used for astronomical telescopes and cameras. The ...
. The system is designed and built by
Astrium
Astrium was an aerospace manufacturer subsidiary of the European Aeronautic Defence and Space Company (EADS) that provided civil and military space systems and services from 2006 to 2013. In 2012, Astrium had a turnover of €5.8 billion and 1 ...
.
* SKDR (S/Ka band Data Relay), a system for relaying data from other satellites built by Alenia Spazio. This uses a 2.85-metre antenna.
* 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.
*
EGNOS
The European Geostationary Navigation Overlay Service (EGNOS) is a satellite-based augmentation system (SBAS) developed by the European Space Agency and EUROCONTROL on behalf of the European Commission. Currently, it supplements the GPS by rep ...
navigation-signal transmitter
* An advanced ion propulsion system with 44 kg of xenon propellant
Operations
, Artemis was used operationally for data relay from ESA's satellites in low Earth orbit; a SILEX link to
SPOT-4 was typically established daily. It was also used on a situational basis; for example, it was used in 2008 to relay information from the
automated transfer vehicle Jules Verne while mission control at Houston was unavailable due to a hurricane.
It is now considered a precursor for the
EDRS programme.
References
External links
Artemis news page at European Space AgencyImages of the Artemis satelliteEDRS SpaceDataHighway
{{DEFAULTSORT:Artemis (Satellite)
Communications satellites in geostationary orbit
Partial satellite launch failures
Spacecraft launched in 2001
European Space Agency satellites
Inter-satellite communications satellites