| Name | Tyvak-0173? (SIRION-3?) |
|---|---|
| Type | CubeSat |
| Units or mass | 6U |
| Organisation | EchoStar |
| Institution | Company |
| Entity | Commercial |
| Nation | US |
| Manufacturer | AIVT by Tyvak |
| Oneliner | Two tiny S-band satellites to jumpstart a low-Earth-orbit constellation using spectrum gained through its acquisition of Helios Wire. |
| Results | [Performed 110 km in altitude orbit raise from TLEs as reported by Jonathan McDowell.](https://twitter.com/planet4589/status/1417672513451175937?s=20) [The orbit raising required about 65 meters per second.](https://spacenews.com/stellar-exploration-propels-echostar-nanosatellite/) |
| Sources | [1] [2] [3] [4] [5] [6] [7] [8] |
Related Spacecraft
| Name | Status | Launch | Orbit |
|---|---|---|---|
| Tyvak-0172 (SIRION-1) | Semi-operational? (Propulsion failed and did not reach nominal operational altitude, but otherwise likely operational) | 2020-08-30 | 97.9 deg, 600 km |
| Tyvak-0171 (SIRION-2?) | Semi-operational? (Propulsion failed and did not reach nominal operational altitude, but otherwise likely operational) | 2020-09-02 | 530 km, 97.5 deg, SSO |
| Tyvak-0173 (SIRION-3, EG 3) | Operational (News on 2021-08-10 about propulsion) | 2021-06-30 | 525 km, 97.5 deg |
Last modified: 2021-08-10
Detailed Tyvak-0173? (SIRION-3?) entry in the Database
Full Nanosats Database (much more data)
