picture of the encyclopedia
previous next
Version 0.81 comes with a new web design! Please allow popups for navigation.


Advanced Relay and Technology Mission


Designation 26863 / 01029A
Launch date 12 Jul 2001
Country of origin Europe
Mission Telecommunications
Geostationary orbit 21.5°E, inclined
Launch vehicle Ariane V142

Launched failed to deliver the satellite in GTO. It was slowly be upped to GEO with its conventional motors (by mid-2002). First the orbit was raised into a circular 31000 km orbit, and in Feb 2002 the final push was made with the ion engines (200 days are needed, orbit raised by 1 km per hour!). It reached its final location on 31 Jan 2003.

The satellite was developed by a consortium headed by the Italian company Alenia Aerospazio. Italy had a 40 percent share, France 21.25 percent, Germany 12 percent, Spain 7.5 percent, Britain 6.7 percent and Belgium four percent. The satellite was worth approx. EUR 820 million. ESA's most expensive satellite.

Artemis also provided data relay links at Ka-Band (23 to 27 GHz) and S-Band (2 GHz). It carried an advanced L-Band (1,61 GHz) payload providing communications to mobile users. Some L-band capacity was used to send EGNOS signals (see Galileo). Artemis was used as relay by Spot 4, Envisat 1, Oicets, Adeos 2 etc.

It succeeded the optical link demonstration with Oicets.

A navigation terminal to guide civilian aircraft, boats and land vehicles was placed onboard at a cost of $8 million.

In Dec 2006, the French military achieved several two-way optical links from an Aircraft in flight with Artemis.

Still operational 10 years after launch.

In 2013, the satellite was sold to Avanti

End of life

Out of service planned in 2014, but started drifting East in May 2016

External resources


sat-index articles

Technical data


Prime contractor Alenia Spazio
Platform Italsat
Mass at launch 3100 kg
Dry mass 1500 kg
Solar array  
Stabilization 3-axis
DC power 2750 W
Design lifetime 10 years

Has got liquid-propellant motors (1 of 410 N and 16 of 10 N thrust) and ion propulsion (15 mN and 18 mN). Tanks contain 1538 kg ergols and 40 kg Xenon.

Four beams will cover Europe, North Africa, and Near East and will be able to handle up to 400 bi-directionnal links.

SKDR (S/Ka band Data Relay)

Main transponders Ka band (20/ 30 GHz)
S band (2 GHz) and Ka band (23/26 GHz)
Backup transponders  
EIRP max  
G/T max  
Frequencies 20/30 GHz
23-26 GHz (interorbit)
2 GHz (interorbit)

The antenna is 2.85 m diameter, aimed at Envisat 1

SILEX (Semi-conductor Inter-satellite Link Experiment) uses optical frequencies; it works with Spot 4 and Oicets. It was successfully tested in Nov 2001 at 50 Mbps.


Main transponders L-band (1.5/1.6 GHz):
Ku-band (12/14 GHz):
Bandwidth L-band: 4 MHz?
Ku-band: 0.9 MHz?
Coverage Europe
EIRP max  

LLM will be leased to Eutelsat.

A navigation payload (25 kg) was also added. It is part of the Egnos program (European Geostationnary Navigation Overlay Service). Two Inmarsat 3 satellites are also part of this program.

© TBS Internet, all rights reserved. All reproduction, copy or mirroring prohibited. Legal notice
francais anglais contact