OperatorAvanti Communications[1]
COSPAR ID2018-033B Edit this at Wikidata
SATCAT no.43272Edit this on Wikidata
Mission duration15 years[1]
Spacecraft properties
BusStar-3 Bus
ManufacturerOrbital ATK[2]
Launch mass4,000 kg
Start of mission
Launch date5 April 2018, 21:34 UTC[2]
RocketAriane 5 flight VA242[2]
Launch siteELA-3, Guiana Space Centre[2]
Orbital parameters
Periapsis altitude35,786 km[3]
Apoapsis altitude35,786 km[3]
Period23h 56min[4]
Capacityup to 28 GHz[1]

HYLAS-4 is a telecommunications satellite owned and operated by Avanti Communications and manufactured by Orbital ATK (now Northrop Grumman Innovation Systems) that was launched by an Ariane 5 rocket on 5 April 2018.[2]


The satellite is built to provide high speed data transmission services to Africa, Latin America and Europe.[5] It is based on Orbital ATK's Star-3 Bus, delivering 64 28 GHz fixed beams covering Africa and parts of Europe. There are also four independent steerable beams that can serve Africa, South America and Europe.[6] The capacity will partially be used to allow Avanti to expand into new markets and provide growth for existing markets.[1]


The satellite was launched into geosynchronous orbit by Arianespace on an Ariane 5 rocket in its ECA variant from ELA-3 at Guiana Space Centre in French Guiana. The launch was originally planned in early 2017 but has been delayed to 21 March 2018, and then to 5 April 2018.[1][2] The satellite reached its geostationary orbital position by 19 April 2018.[7]


  1. ^ a b c d e f g "HYLAS 4". space.skyrocket.de. Retrieved 2018-03-03.
  2. ^ a b c d e f "Ariane 5 (VA242) • DSN-1 & Hylas 4". spaceflight101.com. Retrieved 2018-03-03.
  3. ^ a b c "What Is a Geosynchronous Orbit?". Space.com. Retrieved 2018-03-03.
  4. ^ "Sidereal Day | COSMOS". astronomy.swin.edu.au. Retrieved 2018-03-03.
  5. ^ "Hylas 4 satellite to be launched by Arianespace - Arianespace". Arianespace. Retrieved 2018-03-03.
  6. ^ "Avanti Communications - Satellite Fleet - HYLAS 4". Avanti Communications. Archived from the original on 2018-10-25. Retrieved 2018-10-25.
  7. ^ "Avanti Communications announces its HYLAS 4 satellite has successfully reached its geostationary orbital position | Investor Relations". 10 July 2023.