Sirius FM-1

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Sirius FM-1
Mission typeCommunication
Sirius XM Radio
COSPAR ID2000-035A
SATCAT no.26390Edit this on Wikidata
Mission duration15 years
Spacecraft properties
Launch mass3,800 kilograms (8,400 lb)
Start of mission
Launch date30 June 2000 (2000-06-30)
Launch siteBaikonur 81/24
Orbital parameters
Reference systemGeocentric

Sirius FM-1, also known as Radiosat 1, is an American communications satellite which is operated by Sirius XM Radio, previously Sirius Satellite Radio. It was constructed by Space Systems Loral and is based on the LS-1300 satellite bus. Launch occurred on 30 June 2000, at 22:08 GMT. The launch was contracted by International Launch Services, and used a Proton-K/DM3 carrier rocket flying from Site 81/24 at the Baikonur Cosmodrome.

It is operating in a tundra orbit, from where it provides satellite radio communications services to North America. It has an expected operational lifetime of 15 years.

See also[edit]


  • Krebs, Gunter. "Sirius FM1, FM2, FM3, FM4 (Radiosat 1, 2, 3, 4)". Gunter's Space Page. Retrieved 2009-05-02.
  • McDowell, Jonathan (2000-07-04). "Issue 429". Jonathan's Space Report. Retrieved 2009-05-02.