Intelsat 29e
Mission typeCommunications
COSPAR ID2016-004A Edit this at Wikidata
SATCAT no.41308 [1]
WebsiteIntelsat IS-29e
Mission duration15 years (planned)
3 years (achieved)
Spacecraft properties
SpacecraftIntelsat 29e
Spacecraft typeBoeing 702
BusBoeing 702MP
ManufacturerBoeing Satellite Development Center
Launch mass6,552 kg (14,445 lb)
Dimensions7.5 m × 3 m × 2 m (24.6 ft × 9.8 ft × 6.6 ft)
Power15.8 kW
Start of mission
Launch date27 January 2016, 23:20 UTC
RocketAriane 5ECA (VA-228)
Launch siteCentre Spatial Guyanais, ELA-3
End of mission
Last contact8 April 2019
Orbital parameters
Reference systemGeocentric orbit
RegimeGeosynchronous orbit
Longitude50° West
Band77 transponders:
20 C-band
56 Ku-band
1 Ka-band
BandwidthC-band: 864 MHz
Ku-band: 9,395 MHz
Ka-band: 450 MHz
Coverage areaUnited States, Latin America, North America

Intelsat 29e, also known as IS-29e was a high throughput (HTS) geostationary communications satellite designed and manufactured by Boeing Satellite Development Center on the BSS 702MP satellite bus.[2][3] It is the first satellite of the EpicNG service, and covers North America and Latin America from the 50° West longitude, where it replaced Intelsat 1R. It also replaced Intelsat 805 which was moved from 56.5° West to 169° East.[4][5] It has a mixed C-band, Ku-band and Ka-band payload with all bands featuring wide and the Ku- also featuring spot beams.[2][3][6]

Satellite description

The spacecraft was designed and manufactured by Boeing Satellite Development Center on the Boeing 702MP satellite bus.[2][3] It has a launch mass of 6,552 kg (14,445 lb) and a design life of more than 15 years.[7] When stowed for launch, the satellite measures 7.5 m × 3 m × 2 m (24.6 ft × 9.8 ft × 6.6 ft).[4][7]

It is powered by two wings, with four solar panels each, of triple-junction GaAs solar cells, that span 44 m (144 ft) when deployed.[4][8] Intelsat 29e can generate 15.8 kW at the end of its expected life and has four Li-ion batteries.[4]

This three axis stabilized platform has a bi-propellant propulsion system using Nitrogen tetroxide (NTO) / N2O4. It has a 449 N (101 lbf) liquid apogee engine for orbit raising and 22 N (4.9 lbf) and 4 N (0.90 lbf) thrusters for station keeping.[4] The propellant tanks hold approximately 1,550 kg (3,420 lb) of N2O4 and 2,000 kg (4,400 lb) of NTO.[9] This new series of geosynchronous satellites lack an Earth Sensor, and thus enter Earth pointing attitude based on the orbital position as determined by the star tracker.[10]

Its payload is the first high throughput EpicNG deployment, of the six planned as of January 2016.[11] The EpicNG is characterized by the implementation of frequency reuse due to a mix of frequency and polarization in small spot beams. Not only applied to the classical High-throughput satellite Ka-band, but also applying the same technique in Ku-band and C-band. The EpicNG series also keep the use of wide beams to offer high throughput and broadcast capabilities in the same satellite.[5]

The payload is designed and manufactured by Boeing based on the work of the Wideband Global SATCOM (WGS) constellation.[12] It most innovative feature of this fully digital payload, is that it enables to dynamically link two sites through a single satellite without needing to go through a ground station.[5][11]

In the case of Intelsat-29e, the C-band side has 14 physical transponders with a bandwidth 864 MHz Ku- or 24 transponder equivalent.[4] It covers South America in a wide beam.[6] The Ku-band has physical 56 transponders (249 transponder equivalent) for a total bandwidth of 9,395 MHz.[4] The Ku- spot beams cover the Americas and the North Atlantic route, while a wide beam can broadcast to North America and North Atlantic.[6] The Ka-band payload has 450 MHz of bandwidth on a global beam centered at its position.[4][6]


In July 2009, Intelsat became the first customer of the Boeing 702MP platform, when it placed an order for four spacecraft, Intelsat 21, Intelsat 22, Intelsat 27 and what would become Intelsat 29e.[8]

On 7 June 2012, Intelsat announced the EpicNG platform. It would improve available bandwidth due to the use of frequency reuse and polarization and feature spot and wide beams, enabling high bandwidth and broadcast applications on a backward compatible way. The first two satellites would be Intelsat 29e and Intelsat 33e.[13] On 4 September 2012, Intelsat and Boeing announced that Intelsat 29e, the first EpicNG satellite, would be made by Boeing on the 702MP platform, completing the 2009 order of four such satellites.[14]

In May 2013, Intelsat ordered a further four 702MP-based EpicNG satellites, Intelsat 32e, Intelsat 33e and two as of August 2016 unnamed spacecraft. And in July 2014, a sixth Epic was ordered, Intelsat 35e.[8][11] During 2013, Intelsat signed a contract to launch Intelsat 29e aboard an Ariane 5.[15] Brian Sing, was assigned as Senior Program Manager for the launch aboard the rocket.[16]

During June 2015, the payload was integrated and went through testing. First it was deployed and stowed back, then it went through sound environment and vibration testing, and finally deployment was tested again.[17] On 14 July 2015, the payload integration to the satellite bus and its non-environmental testing was completed. It would then go through the environmental testing campaign which would start with thermal vacuum chamber tests.[12] It is a Boeing design based on the work of the Wideband Global SATCOM (WGS) constellation.[12] On 10 December 2015, Intelsat announced that the launch date for Intelsat 29e had been set for 27 January 2016.[18]

After four years of project development, Intelsat 29e arrived to the launch site aboard an Antonov 124 on 11 December 2015.[19] At the site's Payload Processing Facility (PPF), Boeing technicians unpackaged the spacecraft and associated equipment and performed a quick fit check.[20] On the second weeks of January 2016, the satellite was fueled and installed in the rocket payload adapter.[9][21] By 21 January 2016, the spacecraft had been moved to the Final Assembly Building where it was mated to the launcher rocket.[22] On 26 January 2016, all checks were completed and the launch review for the next day was completed.[15]

On 27 January 2016, at 23:20 UTC, an Ariane 5 ECA launched from the ELA-3 launch pad at the Centre Spatial Guyanais.[2][11] Intelsat 29e, its only passenger, separated 30 minutes later, and the satellite first signals were received shortly afterwards by the Kumsan, South Korea, ground station.[23][24] The next two days were spent evaluating the health of the satellite and determining the exact orbit, then a series of nine orbital maneuvers to raise the perigee to 35,786 km (22,236 mi) were started.[25][26] This orbit circularization would consume approximately 2,500 kg (5,500 lb) of propellant.[9]

When it reached its test position at 49.7° West, it deployed its antennas and solar panels.[10] In a 28 March 2016, it was announced that Intelsat 29e had successfully passed the 30-day payload in-orbit testing (PIOT) and was undergoing the first performance testing with an anchor customer. It had been particularly challenging because it was the first digital configurable payload for Intelsat, and they had to also test the ground segment for the first time.[27]

On 7 April 2019, the propulsion system of Intelsat 29e developed a fuel leak. Service to customers was interrupted, and communication with the satellite intermittent.[28] On 8 April 2019, the ground telescopes of ExoAnalytic Solutions spotted debris around Intelsat 29e. IS-29e is currently tumbling and drifting to the East.[29] Intelsat issued a statement declaring the satellite a total loss on 18 April 2019.[30]


  1. ^ "Intelsat29e". NASA. 14 May 2020. Retrieved 3 December 2020. Public Domain This article incorporates text from this source, which is in the public domain.
  2. ^ a b c d Krebs, Gunter Dirk (21 April 2016). "Intelsat 33e". Gunter's Space Page. Retrieved 24 August 2016.
  3. ^ a b c "Intelsat 29e". Satbeams. Retrieved 24 August 2016.
  4. ^ a b c d e f g h "Ariane 5 Data relating to flight 228" (PDF). Arianespace. January 2016. Retrieved 24 August 2016.
  5. ^ a b c "White Paper — The Intelsat EpicNG Platform" (PDF). Intelsat. Retrieved 24 August 2016.
  6. ^ a b c d "Intelsat 29e at 310° E". Intelsat. Retrieved 24 August 2016.
  7. ^ a b "Launch Kit VA228" (PDF). Arianespace. January 2016. Retrieved 24 August 2016.
  8. ^ a b c "Intelsat" (PDF). Boeing. October 2015. Retrieved 24 August 2016.
  9. ^ a b c "Intelsat 29e Launch: Propulsion Fuel Loading Underway". Intelsat. 13 January 2016. Retrieved 24 August 2016.
  10. ^ a b "Intelsat 29e Launch: In Orbit Testing Underway". Intelsat. 18 February 2016. Retrieved 24 August 2016.
  11. ^ a b c d "Boeing-built Intelsat 29e Satellite Begins New Intelsat Constellation". Boeing. 27 January 2016. Retrieved 24 August 2016.
  12. ^ a b c "Integrating the Digital Payload into Intelsat 29e". Intelsat. 14 July 2015. Retrieved 24 August 2016.
  13. ^ "Intelsat Announces the Intelsat EpicNG Satellite Platform, a High Performance Enhancement to the World's Leading Commercial Satellite Fleet". Intelsat. 7 June 2012. Retrieved 24 August 2016.
  14. ^ "Boeing 702MP Selected for First Intelsat EpicNG Satellite". Intelsat. 4 September 2012. Retrieved 24 August 2016.
  15. ^ a b "Intelsat 29e Launch: All Systems Go". Intelsat. 26 January 2016. Retrieved 24 August 2016.
  16. ^ "Intelsat 29e Launch: The Start of an Epic(NG) Journey". Intelsat. 11 December 2015. Retrieved 24 August 2016.
  17. ^ "Putting the First High Throughput Satellite to the Test". Intelsat. 17 June 2015. Retrieved 24 August 2016.
  18. ^ "Intelsat Announces January 27, 2016 as Expected Launch Date for Intelsat 29e". Intelsat. 10 December 2015. Retrieved 24 August 2016.
  19. ^ "Intelsat 29e Arrives in French Guiana amid Preparations for January 27th Launch on Ariane 5". Intelsat. 11 December 2015. Retrieved 24 August 2016.
  20. ^ "Intelsat 29e Launch: Post-Arrival Activities Underway". Intelsat. 14 December 2015. Retrieved 24 August 2016.
  21. ^ "Intelsat 29e Launch: Fueled and Ready". Intelsat. 16 January 2016. Retrieved 24 August 2016.
  22. ^ "IS-29e Launch: Satellite Attached to the Launcher". Intelsat. 21 January 2016. Retrieved 24 August 2016.
  23. ^ "Intelsat 29e, the First Intelsat EpicNG Satellite, Successfully Launched into Orbit". Intelsat. 27 January 2016. Retrieved 24 August 2016.
  24. ^ "Intelsat 29e Launch: An Epic Start". Intelsat. 29 January 2016. Retrieved 24 August 2016.
  25. ^ "Intelsat 29e Launch: Orbit Raising Underway". Intelsat. 3 February 2016. Retrieved 24 August 2016.
  26. ^ "Putting Intelsat EpicNG to Work at Sea and in the Air". Intelsat. 4 February 2016. Retrieved 24 August 2016.
  27. ^ "Intelsat 29e Completes In-Orbit Testing: The Start of an "EpicNG" Era". Intelsat. 28 March 2016. Retrieved 24 August 2016.
  28. ^ VanBeber, Dianne (10 April 2019). "Intelsat Reports Intelsat 29e Service Outage". Intelsat.
  29. ^ Henry, Caleb (10 April 2019). "Intelsat-29e satellite suffers fuel leak, spotted drifting along GEO arc". SpaceNews.
  30. ^ "Intelsat Reports Intelsat 29e Satellite Failure". 18 April 2019. Retrieved 18 April 2019.