Koreasat 1

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.[3]

Koreasat 1
Mission typeCommunications
OperatorKT Corporation
COSPAR ID1995-041A
SATCAT no.23639
Mission duration10 years
Spacecraft properties
BusAS-3000
ManufacturerMartin Marietta / Lockheed Martin
Launch mass1,464 kilograms (3,228 lb)[1]
Dry mass711 kilograms (1,567 lb)[1]
Start of mission
Launch dateAugust 5, 1995, 11:10 (1995-08-05UTC11:10) UTC[1]
RocketDelta II 7925
Launch siteCape Canaveral LC-17B[2]
End of mission
DisposalDecommissioned
DeactivatedDecember 16, 2005 (2005-12-17)
Orbital parameters
Reference systemGeocentric
RegimeGeostationary
Longitude116° E
Perigee altitude35,776 kilometers (22,230 mi)[2]
Apogee altitude35,796 kilometers (22,243 mi)[2]
Inclination2.7°[2]
Period1,436.1 minutes[2]
EpochAugust 5, 1995 (1995-08-05)
Transponders
Band12 FSS Ku band, 3 BSS Ku band
Bandwidth36 MHz, 27 MHz
Coverage areaSouth Korea, Asia,
 

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.[4]

The satellite was equipped with a Star 30 solid apogee motor. It carried 625 kg (1,378 lb) of fuel for the apogee motor and 187 kg (412 lb) of hydrazine propellant.[5]

It was eventually positioned in geosynchronous orbit 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.[2]

See also

References
  1. Gunter, Krebs. "Koreasat 1, 2". Retrieved May 4, 2017.
  2. Wade, Mark. "Koreasat". Archived from the original on December 28, 2016. Retrieved May 5, 2017.
  3. "Asia Broadcast Satellite Acquires Koreasat-3". Archived from the original on 2017-10-22. Retrieved 2017-10-21.
  4. NASA, GSFC. "Koreasat 1". Retrieved May 5, 2017.
  5. TBS. "Koreasat 1". Retrieved May 5, 2017.


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