| BSAT-4a | |
| Mission Type: | Communication |
| Operator: | B-SAT |
| Cospar Id: | 2017-059B |
| Satcat: | 42951 |
| Website: | http://www.b-sat.co.jp/broadcast-future/ (Japanese) |
| Mission Duration: | 15 years (planned) |
| Spacecraft: | BSAT-4a |
| Spacecraft Type: | BSAT |
| Spacecraft Bus: | SSL 1300 |
| Manufacturer: | Space Systems/Loral |
| Launch Mass: | 3500 kg |
| Launch Date: | 29 September 2017, 21:56 UTC[1] |
| Launch Rocket: | Ariane 5 ECA |
| Launch Site: | Guiana Space Center ELA-3 |
| Launch Contractor: | Arianespace |
| Orbit Reference: | Geocentric orbit |
| Orbit Regime: | Geostationary orbit |
| Orbit Longitude: | 110.0° East (Planned) |
| Apsis: | gee |
| Trans Band: | 24 Ku-band |
| Trans Coverage: | Japan |
| Programme: | B-SAT |
| Previous Mission: | BSAT-3c |
| Next Mission: | BSAT-4b |
BSAT-4a is a geostationary communications satellite ordered by Broadcasting Satellite System Corporation (BSAT) and designed and manufactured by SSL on the SSL 1300 platform, to be stationed on the 110.0° East orbital slot for direct television broadcasting of 4K and 8K Ultra HD resolutions. It was launched on 29 September 2017.[2]
BSAT-4a was designed and manufactured by SSL on the SSL 1300 satellite bus for BSAT. It has an estimated launch mass of with a 15-year design life.
It has a single Ku-band payload with 24 transponders, and covers Japan with 4K and 8K Ultra HD television satellite service.
On 18 June 2015, BSAT ordered the first of its fourth generation satellites from SSL, BSAT-4a. It was expected to be weight around, have 24 Ku-band transponders with a 15-year design life. It was launched on 29 September 2017. It was planned that 4K and 8K signals would be broadcast by summer 2020.
In September 2015, BSAT contracted Arianespace for an Ariane 5 ECA launch service,and received a preliminary license for broadcasting 4K and 8K Ultra HD.