BSAT-4a
{{Short description|Japanese communications satellite}}
{{Use British English|date=August 2020}}
{{Use dmy dates|date=August 2020}}
{{Infobox spaceflight
| name = BSAT-4a
| names_list =
| image =
| image_caption =
| image_alt =
| image_size =
| 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
| dry_mass =
| payload_mass =
| dimensions =
| power =
| launch_date = 29 September 2017, 21:56 UTC[https://spaceflightnow.com/2017/09/29/ariane-5-rocket-deploys-satellites-for-intelsat-and-b-sat/ Ariane 5 rocket deploys satellites for Intelsat and B-SAT]
| launch_rocket = Ariane 5 ECA
| launch_site = Guiana Space Center ELA-3
| launch_contractor = Arianespace
| entered_service =
| disposal_type =
| deactivated =
| destroyed =
| last_contact =
| orbit_reference = Geocentric orbit
| orbit_regime = Geostationary orbit
| orbit_longitude = 110.0° East (Planned)
| orbit_epoch =
| apsis = gee
| trans_band = 24 Ku-band
| trans_frequency =
| trans_bandwidth =
| trans_capacity =
| trans_coverage = Japan
| trans_TWTA =
| trans_EIRP =
| trans_HPBW =
| 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.{{cite web | last=Ford | first=Dominic | title=BSAT-4A | website=In-The-Sky.org | date=1 August 2018 | url=https://in-the-sky.org//spacecraft.php?id=42951}}
Satellite description
BSAT-4a was designed and manufactured by SSL on the SSL 1300 satellite bus for BSAT. It has an estimated launch mass of {{convert|3500|kg}} 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.
History
On 18 June 2015, BSAT ordered the first of its fourth generation satellites from SSL, BSAT-4a. It was expected to be weight around {{convert|3500|kg}}, 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.
References
{{Portal|Spaceflight}}
{{Reflist|2|refs=
{{cite web|url=http://www.b-sat.co.jp/broadcasting-satellite/#popup |title=放送衛星3機のスペック|trans-title=Specifications of the three broadcasting satellites|publisher=Broadcasting Satellite System Corporation|language=Japanese|archive-url=https://web.archive.org/web/20160909171134/http://www.b-sat.co.jp/broadcast-future/|archive-date=2016-09-09|access-date=2016-09-09}}
}}
{{BSAT satellites}}
{{Orbital launches in 2017}}
Category:Communications satellites in geostationary orbit
Category:Satellites using the SSL 1300 bus
Category:Communications satellites of Japan