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Mission type Communication
Operator JSAT Corporation
COSPAR ID 1999-006A
Mission duration 14 12 years (planned)
Spacecraft properties
Bus HS-601
Manufacturer Hughes
Launch mass 2,900 kilograms (6,400 lb)
Start of mission
Launch date 16 February 1999, 01:45:26 (1999-02-16UTC01:45:26Z) UTC
Rocket Atlas IIAS
Launch site Cape Canaveral SLC-36A
Contractor ILS
Orbital parameters
Reference system Geocentric
Regime Geostationary
Longitude 124° East
Perigee 35,785 kilometres (22,236 mi)[1]
Apogee 35,807 kilometres (22,249 mi)[1]
Inclination 0 degrees
Period 24 hours
Band 32 J band

JCSAT-4A, previously designated JCSAT-6, is a Japanese geostationary communications satellite which is operated by JSAT Corporation. It is positioned in geostationary orbit at a longitude of 124° East, from where it is used to provide broadcasting and corporate network communications to Japan.[2]

JCSAT-6 was constructed by Hughes, based on the HS-601 satellite bus. It is equipped with 32 J band (IEEE Ku band) transponders, and at launch it had a mass of 2,900 kilograms (6,400 lb), with an expected operational lifespan of fourteen and a half years[3][4]

It was launched atop an Atlas IIAS carrier rocket flying from Space Launch Complex 36A at the Cape Canaveral Air Force Station. The launch occurred at 01:45:26 GMT on 16 February 1999,[5] and successfully placed JCSAT-6 into a geostationary transfer orbit. From this orbit, the satellite raised itself into a geostationary orbit using an R-4D apogee motor.[6] The final burn to complete its insertion into geosynchronous orbit occurred on 1 March 1999.[7]

See also[edit]


  1. ^ a b McDowell, Jonathan. "Satellite Catalog". Jonathan's Space Page. Retrieved 2009-08-09. 
  2. ^ "JCSAT-4A". Sky Perfect JSAT Corporation. Retrieved 2009-08-08. 
  3. ^ "UCS Satellite Database". Union of Concerned Scientists. 2009-07-01. Retrieved 2009-08-08. 
  4. ^ Krebs, Gunter. "JCSat 5, 6". Gunter's Space Page. Retrieved 2009-08-08. 
  5. ^ McDowell, Jonathan. "Launch Log". Jonathan's Space Page. Retrieved 2009-08-08. 
  6. ^ Wade, Mark. "JCSAT". Encyclopedia Astronautica. Retrieved 2009-08-08. 
  7. ^ McDowell, Jonathan. "Index". Geostationary Orbit Catalog. Jonathan's Space Page. Retrieved 2009-08-08.