JCSAT-17 is a geostationary communications satellite operated by SKY Perfect JSAT Group. The satellite was designed and manufactured by Lockheed Martin Space on the LM-2100 platform, and was launched on 18 February 2020 on an Ariane 5.[3] The satellite mainly provides service to Japan and the surrounding regions. Utilizing several S-band transponders with a flexible processor, the satellite has the capability to redirect communications capacity to concentrate on disaster relief efforts or other high-volume events.[4]

Artist's impression of JCSAT-17
Mission typeCommunication
OperatorSKY Perfect JSAT
COSPAR ID2020-013A
SATCAT no.45245
Mission duration15 Years
Spacecraft properties
ManufacturerLockheed Martin Space
Launch mass5857 kg
Dimensions3.7 x 1.8 m
Power20 kW
Start of mission
Launch date18 February 2020, 22:19:00 UTC
RocketAriane 5 ECA[2]
Launch siteKourou, ELA-3
Deployment date18 February 2020
Orbital parameters
Reference systemGeocentric orbit
Longitude136.0° East
Coverage areaJapan and Asia-Pacific


On 3 February 2016, SKY Perfect JSAT awarded Lockheed Martin Space Systems a contract to build JCSAT-17 using a modernized variant of the A2100 satellite bus.[5] Eventually, this bus became known as LM-2100, which is expected to provide JCSAT-17 with a minimum 15-year lifespan.

On 4 January 2017, SKY Perfect JSAT announced it had contracted Arianespace to launch JCSAT-17 on an Ariane 5 ECA.[6] The satellite was shipped to Kourou in January 2020.[7]


JCSAT-17 was built by Lockheed Martin Space Systems on the LM-2100 platform. The spacecraft uses an 18-metre reflecting antenna to provide targeted S-band communications to Japan and surrounding regions.[8] Once in orbit, the new satellite unfurled a 18-metre-diameter S-band mesh communications antenna made by L3Harris Technologies, formerly known as Harris Corp., of Melbourne, Florida.[9] The spacecraft uses Ku-band transceivers for aircraft avionics communications.[10]


JCSAT-17 was launched from Guiana Space Centre ELA-3 on 18 February 2020 at 22:19:00 UTC aboard an Ariane 5 ECA launch vehicle. As with most Ariane 5 missions, the satellite was co-manifested and therefore shared a launch with the South Korean weather satellite GEO-KOMPSAT 2B.

Approximately 31 minutes after launch, JCSAT-17 separated from the SYLDA fairing and was released into geostationary transfer orbit.[11]

The S-band and C-band payloads on JCSAT-17 will be used by NTT Docomo, a Japanese mobile phone company, to provide mobile connectivity across Japan and surrounding regions, according to Sky Perfect JSAT.[9]


  1. ^ "JCSat 17". Satbeams. Retrieved 26 July 2016.
  2. ^ "Arianespace to launch JCSAT-17 for SKY Perfect JSAT" (Press release). Arianespace. 4 January 2017. Retrieved 8 January 2017.
  3. ^ "Japanese communications satellite and South Korean weather satellite launch on Ariane 5". SpaceNews.com. 18 February 2020. Retrieved 4 June 2020.
  4. ^ "Lockheed Martin Awarded JCSAT-17 Satellite Contract From SKY Perfect JSAT Corporation". Lockheed Martin Space Systems. 3 February 2016. Retrieved 5 August 2016.
  5. ^ "Sky Perfect JSAT Awards Lockheed Martin Contract for JCSAT-17 Satellite". Via Satellite. 3 February 2016. Retrieved 5 June 2020.
  6. ^ "Arianespace to launch JCSAT-17 for SKY Perfect JSAT". Arianespace. Retrieved 5 June 2020.
  7. ^ "Lockheed Martin Ships JCSAT-17 Satellite to Launch Site". Via Satellite. 15 January 2020. Retrieved 5 June 2020.
  8. ^ https://www.arianespace.com/wp-content/uploads/2020/02/VA252-launchkit-EN2.pdf - 18 February 2020
  9. ^ a b "Display: JCSAT-17 2020-013A". NASA. 14 May 2020. Retrieved 24 July 2020.   This article incorporates text from this source, which is in the public domain.
  10. ^ "StackPath". intelligent-aerospace.com. Retrieved 4 June 2020.
  11. ^ "Space Launch Report". spacelaunchreport.com. Retrieved 5 June 2020.