| Name of Satellite, Alternate Names | JCSat 4A (JCSAT 6, Japan Communications Satellite 6) |
| Country of Operator/Owner | Japan |
| Operator/Owner | Sky Perfect JSAT Corporation |
| Users | Commercial |
| Purpose | Communications |
| Class of Orbit | GEO |
| Type of Orbit | |
| Longitude of GEO (degrees) | 123.85 |
| Perigee (km) | 33782 |
| Apogee (km) | 37768 |
| Eccentricity | 0.047289120892158 |
| Inclination (degrees) | 0.07 |
| Period (minutes) | 1435.52 |
| Launch Mass (kg.) | 2900 |
| Dry Mass (kg.) | 1230 |
| Power (watts) | 5200 |
| Date of Launch | 15-02-1999 |
| Expected Lifetime | 14.5 yrs. |
| Contractor | Boeing Satellite Systems |
| Country of Contractor | USA |
| Launch Site | Cape Canaveral |
| Launch Vehicle | Atlas 2AS |
| COSPAR Number | 1999-006A |
| NORAD Number | 25630 |
| Comments | 32 Ku-band; multimedia and Internet access and voice, data and television signals to Japan. |