|Launch date||16 February 1999
|Carrier rocket||Atlas IIAS|
|Launch site||Cape Canaveral SLC-36A|
|Mission duration||14 1⁄2 years (planned)|
|Mass||2,900 kilograms (6,400 lb)|
|Apoapsis||35,807 kilometres (22,249 mi)|
|Periapsis||35,785 kilometres (22,236 mi)|
|Orbital period||24 hours|
|Transponders||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.
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
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, 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. The final burn to complete its insertion into geosynchronous orbit occurred on 1 March 1999.
 See also
- McDowell, Jonathan. "Satellite Catalog". Jonathan's Space Page. Retrieved 2009-08-09.
- "JCSAT-4A". Sky Perfect JSAT Corporation. Retrieved 2009-08-08.
- "UCS Satellite Database". Union of Concerned Scientists. 2009-07-01. Retrieved 2009-08-08.
- Krebs, Gunter. "JCSat 5, 6". Gunter's Space Page. Retrieved 2009-08-08.
- McDowell, Jonathan. "Launch Log". Jonathan's Space Page. Retrieved 2009-08-08.
- Wade, Mark. "JCSAT". Encyclopedia Astronautica. Retrieved 2009-08-08.
- McDowell, Jonathan. "Index". Geostationary Orbit Catalog. Jonathan's Space Page. Retrieved 2009-08-08.
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