Sirius FM-1

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Sirius FM-1
Mission type Communication
Operator Sirius
Sirius XM Radio
COSPAR ID 2000-035A
Mission duration 15 years
Spacecraft properties
Bus LS-1300
Manufacturer Loral
Launch mass 3,800 kilograms (8,400 lb)
Start of mission
Launch date 30 June 2000 (2000-06-30)
Rocket Proton-K/DM3
Launch site Baikonur 81/24
Contractor ILS
Orbital parameters
Reference system Geocentric
Regime Tundra

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.

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