| Auto: | all |
| Chollian | |
| Mission Type: | Communication Oceanography Weather |
| Operator: | KARI |
| Cospar Id: | 2010-032A |
| Satcat: | 36744 |
| Mission Duration: | Planned: 7 years Final: 9 years |
| Spacecraft Bus: | Eurostar-3000S |
| Manufacturer: | EADS Astrium |
| Power: | 2.5 kilowatts |
| Launch Date: | UTC |
| Launch Rocket: | Ariane 5 ECA (V195) |
| Launch Site: | Kourou ELA-3 |
| Launch Contractor: | Arianespace |
| Deactivated: | UTC |
| Orbit Epoch: | 23 January 2015, 17:05:20 UTC[1] |
| Orbit Reference: | Geocentric |
| Orbit Regime: | Geostationary |
| Orbit Periapsis: | 35791km (22,239miles) |
| Orbit Apoapsis: | 35795km (22,242miles) |
| Orbit Inclination: | 0.03 degrees |
| Orbit Period: | 1436.13 minutes |
| Orbit Longitude: | 128.2° East |
| Apsis: | gee |
Chollian, [2] also known as Communication, Ocean and Meteorological Satellite 1[3] (COMS-1), was a South Korean satellite which was launched on 26 June 2010 and began operations on 1 April 2011. It was operated by the Korea Aerospace Research Institute, who used it for communication, oceanography, and meteorological observation.
COMS-1 was constructed by EADS Astrium, and was based on the Eurostar-3000S satellite bus, bringing together lessons learned from Eurostar satellites and NASA-made GOES satellites respectively. It had a mass of, and carried transponders broadcasting in the D/E and K bands of the NATO-defined spectrum, or the L/S and Ka bands of the IEEE-defined spectrum respectively. Its single solar array generated a minimum of 2.5 kilowatts of power.[4]
COMS-1 was launched by Arianespace using an Ariane 5 ECA carrier rocket lifting off from ELA-3 at the Guiana Space Centre in Kourou, French Guiana. The first launch attempt occurred on 23 June 2010; the launch was scrubbed due to a problem with one of the rocket's subsystems.[5] A subsequent attempt on 24 June was also scrubbed, due to a problem with the pressurisation of the rocket's fuel tanks. The launch occurred at 21:41 UTC on 26 June 2010.[6] [7] The Saudi Arabian Arabsat-5A satellite was launched by the same rocket, with a SYLDA adaptor being used to separate the spacecraft. Arabsat-5A was mounted atop the SYLDA, with COMS-1 underneath it.[8]
Following launch, COMS-1 separated into a geosynchronous transfer orbit. It used an apogee motor to raise itself into geosynchronous orbit. It then underwent testing before beginning operations at a longitude of 128.2 degrees East on 1 April 2011.[9] [10] Its mission was scheduled to last seven years,[4] though the satellite had a design life of ten years.[11]
COMS-1 was deactivated on 31 March 2020, following a two-year extension of its seven-year primary mission.
As follow-up satellites to Chollian-1, Chollian-2A and Chollian-2B were launched in December 2018 and in February 2020 respectively.[12]