KOMPSAT-1

KOMPSAT-1 (Korean Multi-purpose Satellite-1), also known as Arirang-1,^[3] was a satellite created by the Korea Aerospace Industries (KAI) and Korea Aerospace Research Institute (KARI), and launched by a United States launch vehicle on 21 December 1999. This was the first satellite built primarily by South Korean engineers, although previous foreign-built satellites had been launched by Korean companies. It took its name from the popular Korean folk song Arirang.

KOMPSAT-1

Names	Korean Multi-purpose Satellite-1 Arirang-1
Mission type	Earth observation
Operator	Korea Aerospace Research Institute
COSPAR ID	1999-070A
SATCAT no.	26032
Mission duration	3 years (planned) 8 years (achieved)
Spacecraft properties
Spacecraft type	KOMPSAT
Bus	TOMS-EP[1]
Manufacturer	Korea Aerospace Industries Korea Aerospace Research Institute TRW (bus)
Launch mass	470 kg (1,040 lb)
Dimensions	1.33 m (4 ft 4 in) in diameter 2.33 m (7 ft 8 in) in length
Power	636 watts
Start of mission
Launch date	21 December 1999, 07:13 UTC
Rocket	Taurus 2110
Launch site	Vandenberg, LC-576E
Contractor	Orbital Sciences Corporation
End of mission
Deactivated	31 January 2008
Last contact	30 December 2007
Orbital parameters
Reference system	Geocentric orbit[2]
Regime	Sun-synchronous orbit
Altitude	685 km (426 mi)
Inclination	98.13°
Period	98.46 minutes
Instruments
Electro-Optical Camera (EOC) High Energy Particles Detector (HEPD) Ionospheric Measurement Sensor (IMS)
KOMPSAT programme KOMPSAT-2 →

Instruments

It carried an Electro-Optical Camera (EOC) able to distinguish objects with a diameter of 6.6 m (22 ft) with a footprint of 17 km. The satellite carried remote sensing instruments for providing digital cartography of Korea, and status of marine biology. Also included was the Ionospheric Measurement Sensor (IMS) to monitor ionospheric parameters along the satellite orbit and the High Energy Particles Detector (HEPD).^[4]

High Energy Particle Detector (HEPD)

The High Energy Particle Detector (HEPD) instrument consists of a Proton and Electron Spectrometer (PES), a Linear Energy transfer Spectrometer (LET), a Total Dose Monitor (TDM), and a Single Event Monitor (SEM), PES measures protons from 6.4 MeV to 38 MeV in 3 energy channels, electrons from 0.25 MeV to <2.0 MeV in 3 energy channels, and alpha particles from 15 MeV to 60 MeV in an energy channel. LET measures linear energy transfer. TDM measures total ionizing dose of radiation accumulated on RADFET dosimeters. SEM measures single event upset (SEU).^[5]

Ionospheric Measurement Sensor (IMS)

The Ionospheric Measurement Sensor (IMS) is composed of a Langmuir probe (LP) and of the Electron Temperature Probe (ETP) developed by K. Oyama (Institute of Space and Astronautical Science (ISAS), Japan). LP measures the in-situ electron temperature and density and ETP measures the in-situ electron temperature and floating potential. The instrument monitored the variation of the nighttime ionosphere along the satellite track until the unexpected power failure of the probes on 2 August 2001.^[6]

Launch

The satellite was launched from Vandenberg Air Force Base in California on a Taurus 2110. It had been built in Daedeok Science Town in Daejeon, South Korea. The parts were shipped in three stages from Korea to California by First Express International, a Korean shipping firm.^[7]

The KOMPSAT-1 was succeeded by the KOMPSAT-2 in 2006.

Mission

On 30 December 2007, the KARI reported that they had lost contact with the satellite.^[1] It is suspected to have had a malfunction that has affected power generation. After the loss of contact with the satellite, the mission was formally ended 31 January 2008.^[1]