Koreasat 1 was a South Korean communications satellite launched by a Delta II rocket from Cape Canaveral Air Force Station, Florida, United States.

[3] 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.

In order to extend its lifetime, it gave up north–south station-keeping operating in "inclined mode."

[4] The satellite was equipped with a Star 30 solid apogee motor.

[5] It was eventually positioned in geosynchronous orbit at 116° E operated it at 47.5° E where it was focused on Hungary.