Chollian

Chollian
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 (2010-06-26UTC21:41Z) UTC
Rocket Ariane 5ECA
Launch site Kourou ELA-3
Contractor Arianespace
Orbital parameters
Reference system Geocentric
Regime Geostationary
Longitude 128.2° East
Perigee 35,791 kilometres (22,239 mi)[1]
Apogee 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, (Korean, lit. Thousand Li View)[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.

COMS-1 was constructed by EADS Astrium, and is based on the Eurostar-3000S satellite bus. 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]

References

  1. 1 2 3 4 5 "COMS 1 Satellite details 2010-032A NORAD 36744". N2YO. 23 January 2015. Retrieved 25 January 2015.
  2. ↑ McDowell, Jonathan (28 June 2010). "Issue 629". Jonathan's Space Report. Retrieved 29 June 2010.
  3. ↑ "Space Programs in Korea" (PDF). Asia Pacific Space Activity Forum. December 2006. p. 18. Retrieved 26 June 2010.
  4. 1 2 Krebs, Gunter. "COMS 1". Gunter's Space Page. Retrieved 26 June 2010.
  5. ↑ "Flight 195 – Arabsat-5A - COMS: Launch delayed". Arianespace. 23 June 2010. Retrieved 26 June 2010.
  6. 1 2 "Arianespace launch 195 – Arabsat-5A and COMS: Liftoff is set for Saturday, June 26, 2010". Arianespace. 26 June 2010. Retrieved 26 June 2010.
  7. ↑ http://www.arianespace.com/news-mission-update/2010/704.asp
  8. ↑ "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.
  9. ↑ "Satellite Launches for the Middle East and South Korea" (PDF). Arianespace. Archived from the original (PDF) on 4 July 2010. Retrieved 26 June 2010.
  10. ↑ "COMS". EADS Astrium. Archived from the original on 15 July 2010. Retrieved 26 June 2010.

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