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Chollian

Chollian

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 (2010-06-26UTC21:41Z) UTC
Rocket	Ariane 5 ECA
Launch site	Kourou ELA-3
Contractor	Arianespace
End of mission
Deactivated	31 March 2020, 23:59 (2020-04-01UTC00:00) 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, (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.

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 CentreinKourou, 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]

As follow-up satellites to Chollian-1, Chollian-2A and Chollian-2B were launched in December 2018 and in February 2020 respectively.^[12]

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