Chollian
South Korean satellite (2010–2020)
From Wikipedia, the free encyclopedia
Chollian, (Korean: 천리안; lit. 'Thousand Li View; clairvoyance')[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.
_(1089).jpeg)
Chollian 2A (GEO-KOMPSAT 2A) final inspection | |
| Mission type | Communication Oceanography Weather |
|---|---|
| Operator | KARI |
| COSPAR ID | 2010-032A |
| SATCAT no. | 36744 |
| Mission duration | Planned: 7 years Final: 9 years |
| Spacecraft properties | |
| Bus | Eurostar-3000S |
| Manufacturer | EADS Astrium |
| Launch mass | 2,460 kilograms (5,420 lb) |
| Power | 2.5 kilowatts |
| Start of mission | |
| Launch date | 26 June 2010, 21:41 UTC |
| Rocket | Ariane 5 ECA (V195) |
| Launch site | Kourou ELA-3 |
| Contractor | Arianespace |
| End of mission | |
| Deactivated | 31 March 2020, 23:59 UTC |
| Orbital parameters | |
| Reference system | Geocentric |
| Regime | Geostationary |
| Longitude | 128.2° East |
| Perigee altitude | 35,791 kilometres (22,239 mi)[1] |
| Apogee altitude | 35,795 kilometres (22,242 mi)[1] |
| Inclination | 0.03 degrees[1] |
| Period | 1436.13 minutes[1] |
| Epoch | 23 January 2015, 17:05:20 UTC[1] |
Chollian programme | |
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 2,460 kilograms (5,420 lb), 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.[6] 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.[9] Sister satellites Chollian-2A and Chollian-2B were launched in 2018[12] and 2020.[13]
