Chollian
Chollian, (Korean: 천리안, lit. Thousand Li View, clairvoyance)[2] also known as Communication, Ocean and Meteorological Satellite 1[3] (COMS-1), is a South Korean satellite which was launched in June, 2010. It will be operated by the Korea Aerospace Research Institute, who will use it for communication, oceanography, and meteorological observation.
| Mission type | Communication Oceanography Weather |
|---|---|
| Operator | KARI |
| COSPAR ID | 2010-032A |
| SATCAT no. | 36744 |
| Mission duration | 7 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 5ECA |
| Launch site | Kourou ELA-3 |
| Contractor | Arianespace |
| 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] |
COMS-1 was constructed by EADS Astrium, and is based on the Eurostar-3000S satellite bus, bringing together lessons learned from Eurostar satellites and NASA-made GOES satellites respectively. It has a mass of 2,460 kilograms (5,420 lb), and carries 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 is expected to generate a minimum of 2.5 kilowatts of power.[4]
COMS-1 was launched by Arianespace using an Ariane 5ECA carrier rocket lifting off from ELA-3 at the Guiana Space Centre in Kourou, French Guiana. The first attempt to launch it occurred on 23 June 2010, however 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 will use an apogee motor to raise itself into geosynchronous orbit. Once it reaches this orbit, it will undergo testing before beginning operations at a longitude of 128.2 degrees East.[9] Its mission is scheduled to last seven years,[4] however the satellite has a design life of ten years.[10]
As follow-up satellites to Chollian-1, Chollian-2A and Chollian-2B were launched in December 2018 and in February 2020 respectively.[11]
References
- "COMS 1 Satellite details 2010-032A NORAD 36744". N2YO. 23 January 2015. Retrieved 25 January 2015.
- McDowell, Jonathan (28 June 2010). "Issue 629". Jonathan's Space Report. Archived from the original on 24 October 2010. Retrieved 29 June 2010.
- "Space Programs in Korea" (PDF). Asia Pacific Space Activity Forum. December 2006. p. 18. Retrieved 26 June 2010.
- Krebs, Gunter. "COMS 1". Gunter's Space Page. Retrieved 26 June 2010.
- "Flight 195 – Arabsat-5A - COMS: Launch delayed". Arianespace. 23 June 2010. Retrieved 26 June 2010.
- "Arianespace launch 195 – Arabsat-5A and COMS: Liftoff is set for Saturday, June 26, 2010". Arianespace. 26 June 2010. Retrieved 26 June 2010.
- http://www.arianespace.com/news-mission-update/2010/704.asp
- "Ariane 5 Does The Heavy Lifting For Arabsat-5A and COMS". Satnews Daily. 21 June 2010. Archived from the original on 16 July 2011. Retrieved 23 June 2010.
- "Satellite Launches for the Middle East and South Korea" (PDF). Arianespace. Archived from the original (PDF) on 4 July 2010. Retrieved 26 June 2010.
- "COMS". EADS Astrium. Archived from the original on 15 July 2010. Retrieved 26 June 2010.
- "South Korea's Chollian-2B Environmental Satellite To Launch In February 2020". Spacewatch.