| Sirius FM-2 | |
| Mission Type: | Communication |
| Operator: | Sirius Sirius XM Radio |
| Cospar Id: | 2000-051A |
| Mission Duration: | Planned: 15 years; Achieved: 15-16 years |
| Spacecraft Bus: | LS-1300 |
| Manufacturer: | Loral |
| Launch Mass: | 3800kg (8,400lb) |
| Launch Site: | Baikonur 81/23 |
| Disposal Type: | Disposal orbit |
| Orbit Reference: | Geocentric |
| Orbit Regime: | Tundra |
| Apsis: | gee |
Sirius FM-2, also known as Radiosat 2, was an American communications satellite which was operated by Sirius XM Radio, previously Sirius Satellite Radio. It was constructed by Space Systems Loral and was based on the LS-1300 satellite bus. Launch occurred on 5 September 2000, at 09:43 GMT. The launch was contracted by International Launch Services, and used a Proton-K/DM3 carrier rocket flying from Site 81/23 at the Baikonur Cosmodrome.
It was operating in a tundra orbit, from where it provided satellite radio communications services to North America. It had an expected operational lifetime of 15 years.
In 2016, the satellite was moved into a disposal orbit and decommissioned.[1]