NamesJCSAT-6 (order to Feb 1999)
JCSAT-4A (Feb 1999 onward)
Mission typeCommunications
OperatorSKY Perfect JSAT Group
COSPAR ID1999-006A
SATCAT no.25630
Mission duration14.5 years (planned)
Spacecraft properties
Spacecraft typeJCSAT
Launch mass2,900 kilograms (6,400 lb)
Start of mission
Launch date16 February 1999, 01:45:26 UTC
RocketAtlas IIAS (AC-152)
Launch siteCape Canaveral, LC-36A
ContractorInternational Launch Services (ILS)
Orbital parameters
Reference systemGeocentric orbit
RegimeGeostationary orbit
Longitude124° East
Band32 Ku band
Coverage areaJapan

JCSAT-4A, designated JCSAT-6 before launch, is a Japanese geostationary communications satellite which is operated by JSAT Corporation (now SKY Perfect JSAT Group). 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.[1]

Spacecraft description

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


It was launched atop an Atlas IIAS launch vehicle flying from Launch Complex 36A at the Cape Canaveral Air Force Station. The launch occurred at 01:45:26 UTC on 16 February 1999,[4] 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.[5] The final burn to complete its insertion into geosynchronous orbit occurred on 1 March 1999.[6]

See also


  1. ^ "JCSAT-4A". Sky Perfect JSAT. Archived from the original on 13 July 2009. Retrieved 8 August 2009.
  2. ^ "UCS Satellite Database". Union of Concerned Scientists. 1 July 2009. Retrieved 8 August 2009.
  3. ^ Krebs, Gunter. "JCSat 5, 6". Gunter's Space Page. Retrieved 8 August 2009.
  4. ^ McDowell, Jonathan (14 March 2021). "Launch Log". Jonathan's Space Report. Retrieved 20 March 2021.
  5. ^ Wade, Mark. "JCSAT". Encyclopedia Astronautica. Retrieved 8 August 2009.
  6. ^ McDowell, Jonathan. "Index". Geostationary Orbit Catalog. Jonathan's Space Report. Archived from the original on 6 April 2010. Retrieved 8 August 2009.