Chollian

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title: "Chollian" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["weather-satellites-of-south-korea", "spacecraft-launched-in-2010", "spacecraft-decommissioned-in-2020", "communications-satellites-in-geostationary-orbit", "ariane-commercial-payloads"] description: "South Korean satellite (2010–2020)" topic_path: "geography/south-korea" source: "https://en.wikipedia.org/wiki/Chollian" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary South Korean satellite (2010–2020) ::

::data[format=table title="Infobox spaceflight|auto=all"]

Field	Value
name	Chollian
image	천리안 2A호 최종 점검(3) (1089).jpeg
image_caption	Chollian 2A (GEO-KOMPSAT 2A) final inspection
mission_type	Communication
Oceanography
Weather
operator	KARI
COSPAR_ID	2010-032A
SATCAT	36744
mission_duration	Planned: 7 years
Final: 9 years
spacecraft_bus	Eurostar-3000S
manufacturer	EADS Astrium
launch_mass	2460 kg
power	2.5 kilowatts
launch_date	UTC
launch_rocket	Ariane 5 ECA (V195)
launch_site	Kourou ELA-3
launch_contractor	Arianespace
deactivated	UTC
orbit_epoch	23 January 2015, 17:05:20 UTC
orbit_reference	Geocentric
orbit_regime	Geostationary
orbit_periapsis	35791 km
orbit_apoapsis	35795 km
orbit_inclination	0.03 degrees
orbit_period	1436.13 minutes
orbit_longitude	128.2° East
apsis	gee
programme	Chollian programme
next_mission	Chollian-2A
::

| name = Chollian | image = 천리안 2A호 최종 점검(3) (1089).jpeg | image_caption = Chollian 2A (GEO-KOMPSAT 2A) final inspection

| mission_type = Communication Oceanography Weather | operator = KARI | COSPAR_ID = 2010-032A | SATCAT = 36744 | mission_duration = Planned: 7 years Final: 9 years

| spacecraft_bus = Eurostar-3000S | manufacturer = EADS Astrium | dry_mass = | launch_mass = 2460 kg | power = 2.5 kilowatts

| launch_date = UTC | launch_rocket = Ariane 5 ECA (V195) | launch_site = Kourou ELA-3 | launch_contractor = Arianespace

| disposal_type = | deactivated = UTC | last_contact =

| orbit_epoch = 23 January 2015, 17:05:20 UTC | orbit_reference = Geocentric | orbit_regime = Geostationary | orbit_periapsis = 35791 km | orbit_apoapsis = 35795 km | orbit_inclination = 0.03 degrees | orbit_period = 1436.13 minutes | orbit_longitude = 128.2° East | apsis = gee

| programme = Chollian programme | previous_mission = | next_mission = Chollian-2A Chollian, () also known as Communication, Ocean and Meteorological Satellite 1 (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 2460 kg, 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.

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

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. Its mission was scheduled to last seven years, though the satellite had a design life of ten years.

COMS-1 was deactivated on 31 March 2020, following a two-year extension of its seven-year primary mission. Sister satellites Chollian-2A and Chollian-2B were launched in 2018 and 2020.

References

References

1. (23 January 2015). "COMS 1 Satellite details 2010-032A NORAD 36744". N2YO.
2. McDowell, Jonathan. (28 June 2010). "Issue 629". Jonathan's Space Report.
3. (December 2006). "Space Programs in Korea". Asia Pacific Space Activity Forum.
4. Krebs, Gunter. "COMS 1". Gunter's Space Page.
5. (23 June 2010). "Flight 195 – Arabsat-5A - COMS: Launch delayed". Arianespace.
6. (26 June 2010). "Arianespace launch 195 – Arabsat-5A and COMS: Liftoff is set for Saturday, June 26, 2010". Arianespace.
7. (26 June 2010). "Ariane 5 marks its 37th consecutive success by orbiting the Arabsat-5A and COMS satellites". Arianespace.
8. (21 June 2010). "Ariane 5 Does The Heavy Lifting For Arabsat-5A and COMS". Satnews Daily.
9. (5 February 2020). "COMS Retirement Information". [[World Meteorological Organization.
10. "Satellite Launches for the Middle East and South Korea". Arianespace.
11. "COMS". EADS Astrium.
12. (5 December 2018). "‘독수리눈’ 천리안 2A호 발사 뒤 첫 교신 성공". [[Hankyoreh Shinmun]].
13. (19 February 2020). "우리 기술로 만든 미세먼지 감시 위성 '천리안 2B' 발사 성공". [[Hankyoreh Shinmun]].

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