EchoStar XXI


EchoStar XXI
Mission typeCommunication
OperatorEchoStar Corporation
COSPAR ID2017-032A
SATCAT no.42749
Mission durationPlanned: 15+ years
Elapsed: 4 years, 5 months, 29 days
Spacecraft properties
BusSSL 1300
ManufacturerSpace Systems Loral
Launch mass6,871 kilograms (15,148 lb)
Start of mission
Launch date8 June 2017, 03:45 (2017-06-08UTC03:45Z) UTC
RocketILS Proton Breeze M
Launch siteBaikonur Cosmodrome
ContractorInternational Launch Services
Orbital parameters
Reference systemGeocentric
Longitude10.25° East
Perigee altitude35,784.4 kilometers (22,235.4 mi)
Apogee altitude35,801.8 kilometers (22,246.2 mi)
Inclination6.8 degrees
Period23.93 hours
Epoch22 July 2018, 15:03 UTC[1]
Coverage areaEurope

EchoStar XXI (formerly known as TerreStar 2[2]) is a European communications satellite which is operated by Echostar Corporation. It was constructed by Space Systems/Loral, based on the SSL 1300 satellite bus, and carries S band transponders which will be used to provide 2GHz mobile connectivity throughout Europe.

EchoStar XXI was launched at 03:45 UTC on June 8, 2017[3] from the Baikonur Cosmodrome in Kazakhstan. This satellite was the heaviest commercial payload flown aboard a Russian booster at the time of its launch. [4]

Before being launched, the satellite was known as TerreStar-2, a ground spare for TerreStar Networks' satellite-terrestrial telephone network.[5]


  1. ^ "EchoStar XX1 Satellite details 2017-032A NORAD 42749". N2YO. 22 July 2018. Retrieved 22 July 2018.
  2. ^ "Echostar 21". Retrieved 2018-07-22.
  3. ^ "EchoStar XXI Satellite Successfully Launched". EchoStar Corporation. 2017-06-08. Retrieved 2018-07-22.
  4. ^ "Video: Proton rocket returns to service with launch of EchoStar 21". Retrieved 2018-07-22.
  5. ^ "TerreStar-2 in Final Payload Integration". Retrieved 2018-07-22.

External links

  • Echostar Corporation
  • Launch video at Spaceflight Now
  • NASA Spaceflight thread for EchoStar XXI Launch
  • YouTube video (Russian language) of the rocket rolling to the pad