Koreasat 1 was a South Korean communications satellite launched by a Delta II rocket from Cape Canaveral Air Force Station, Florida, United States. Owned by KT Corporation.Asia Broadcast Satellite Acquires Koreasat-3
/ref> One of the boosters of the Delta II rocket failed to separate from the first stage of the spacecraft, placing it 5,000 km short of its planned GTO apogee. The satellite had to use up 7.5 years worth of its 12-year lifetime fuel supply to make up the deficiency, shortening Koreasat 1's expected life to about 4.5 years. In order to extend its lifetime, it gave up north–south station-keeping operating in "inclined mode." In the end, the satellite managed to function for 10 years. The satellite was equipped with a Star 30 solid apogee motor. It carried of fuel for the apogee motor and of

hydrazine Hydrazine is an inorganic compound with the chemical formula . It is a simple pnictogen hydride, and is a colourless flammable liquid with an ammonia-like odour. Hydrazine is highly toxic unless handled in solution as, for example, hydrazine ...

propellant. It was eventually positioned in

geosynchronous orbit A geosynchronous orbit (sometimes abbreviated GSO) is an Earth-centered orbit with an orbital period that matches Earth's rotation on its axis, 23 hours, 56 minutes, and 4 seconds (one sidereal day). The synchronization of rotation and orbital ...

at 116° E operated it at 47.5° E where it was focused on Hungary. The satellite went out of service on December 16, 2005, and was moved to the graveyard orbit. As of March 9, 2007, it was located at 152.88° E drifting at 2.155° W per day.

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* Communications satellites Satellites of South Korea Partial satellite launch failures Spacecraft launched in 1995 1995 in spaceflight 1995 in South Korea {{spacecraft-stub

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