Chollian

COMS-1

Operator	KARI
Major contractors	EADS Astrium
Bus	Eurostar-3000S
Mission type	Communication Oceanography Weather
Launch date	26 June 2010
Carrier rocket	Ariane 5ECA
Launch site	Kourou ELA-3
Mission duration	7 years
Mass	2,460 kilograms (5,400 lb)
Power	2.5 kW
Orbital elements
Regime	Geostationary
Altitude	36,000 kilometres (22,000 mi)
Orbital period	24 hours
Longitude	128.2° East

Chollian, (Korean, lit. Thousand Li View)^[1] also known as Communication, Ocean and Meteorological Satellite 1^[2] (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.

COMS-1 was constructed by EADS Astrium, and is based around the Eurostar-3000S satellite bus. It has a mass of 2,460 kilograms (5,400 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.^[3]

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.^[4] A subsequent attempt on 24 June was also scrubbed, due to a problem with the pressurisation of the rocket's fuel tanks.^[5] The launch occurred at 21:41 UTC on 26 June 2010.^[6][5] 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.^[7]

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.^[8] Its mission is scheduled to last seven years,^[3] however the satellite has a design life of ten years.^[9]

References

1. ^ McDowell, Jonathan (28 June 2010). "Issue 629". Jonathan's Space Report. http://planet4589.org/space/jsr/back/news.629. Retrieved 29 June 2010. 
2. ^ "Space Programs in Korea". Asia Pacific Space Activity Forum. December 2006. p. 18. http://www.aprsaf.org/data/aprsaf13_data/7_Space%20Program%20Korea_KARI_final_061205_1330day1.pdf. Retrieved 26 June 2010. 
3. ^ ^{a b} Krebs, Gunter. "COMS 1". Gunter's Space Page. http://space.skyrocket.de/doc_sdat/coms.htm. Retrieved 26 June 2010. 
4. ^ "Flight 195 – Arabsat-5A - COMS: Launch delayed". Arianespace. 23 June 2010. http://www.arianespace.com/news-press-release/2010/06-23-2010-V195-launch-postponed.asp. Retrieved 26 June 2010. 
5. ^ ^{a b} "Arianespace launch 195 – Arabsat-5A and COMS: Liftoff is set for Saturday, June 26, 2010". Arianespace. 26 June 2010. http://www.arianespace.com/news-press-release/2010/06-26-2010-launch-date.asp. Retrieved 26 June 2010. 
6. ^ http://www.arianespace.com/news-mission-update/2010/704.asp
7. ^ "Ariane 5 Does The Heavy Lifting For Arabsat-5A and COMS". Satnews Daily. 21 June 2010. Archived from the original on 26 June 2010. http://www.webcitation.org/5qi4Qt8cb. Retrieved 23 June 2010. 
8. ^ "Satellite Launches for the Middle East and South Korea". Arianespace. http://www.arianespace.com/images/launch-kits/launch-kit-pdf-eng/GB-ARABSAT-5A-COMS.pdf. Retrieved 26 June 2010. 
9. ^ "COMS". EADS Astrium. http://www.astrium.eads.net/node.php?articleid=4694. Retrieved 26 June 2010.