Eutelsat 172B
Mission typeCommunications
COSPAR ID2017-029B[1]
SATCAT no.42741[1]
WebsiteEutelsat 172B
Mission duration15 years (planned)
7 years and 14 days (elapsed)[2]
Spacecraft properties
BusEurostar-3000 EOR
ManufacturerAirbus Defence and Space
Launch mass3,551 kg (7,829 lb)
Start of mission
Launch dateJune 1, 2017 (2017-06-01)
RocketAriane 5 ECA
Launch siteGuiana Space Centre
Orbital parameters
Reference systemGeocentric
Longitude172° E
Band14 C band transponders
36 Ku band transponders
Ku band[2]
Coverage areaAsia-Pacific

Eutelsat 172B is a French communications satellite built by Airbus Defence and Space and operated by Eutelsat Communications. Launched on June 1, 2017, it has an expected service life of 15 years. Its orbit along with Eutelsat 172A allows it to cover the Asia-Pacific region, providing enhanced broadband and broadcast services.


Eutelsat 172B's satellite bus is the Eurostar E3000. It has a launch mass of 3,551 kg (7,829 lb) and has two deployable solar panels.[2][3][4] The satellite also uses the Fakel SPT140D electric propulsion thrusters for initial orbit raising and later orbit station-keeping. It took four months to go to desired altitude, however, it consumed six times less propellant than if using chemical propellant.[3][4][5] The satellite has fourteen C band, thirty-six regular Ku band transponders, and a high-throughput Ku band.[2][6]


Eutelsat 172B launched from Guiana Space Centre on June 1, 2017, at 23:45 UTC, on board an Ariane 5 ECA rocket along with ViaSat-2.[7] After launch, Eutelsat 172B used its propulsion system to raise itself into a geostationary orbit over a period of four months. It was placed at a longitude of 172° E, hence its name. Its longitude allows it to serve users in the Asia-Pacific region.[1][3][4]


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  2. ^ a b c d "Eutelsat 172B". Gunter's Space Page. Archived from the original on 2021-10-04. Retrieved 2021-12-11.
  3. ^ a b c d "Airbus-built full electric EUTELSAT 172B satellite reaches geostationary orbit in record time | Airbus". 28 October 2021. Archived from the original on 2021-12-11. Retrieved 2021-12-11.
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  5. ^ "Eutelsat 172B - eoPortal Directory - Satellite Missions". Archived from the original on 2021-12-11. Retrieved 2021-12-11.
  6. ^ "EUTELSAT 172B | Eutelsat Satellites | Eutelsat". Archived from the original on 2021-12-11. Retrieved 2021-12-11.
  7. ^ "Flight VA237: On mission that boosts global connectivity for ViaSat and Eutelsat, the 79th successful launch by Arianespace's Ariane 5 sets a new performance record and orbits its first all-electric satellite". Arianespace. Archived from the original on 2021-12-11. Retrieved 2021-12-11.