| USA-319 | |
| Names List: | Navstar 81 GPS-III SV05 Neil Armstrong |
| Mission Type: | Navigation |
| Operator: | USSF |
| Cospar Id: | 2021-054A |
| Satcat: | 48859 |
| Mission Duration: | 15 years (planned) |
| Spacecraft: | GPS-III SV05 |
| Spacecraft Type: | GPS Block III |
| Manufacturer: | Lockheed Martin |
| Launch Mass: | 4331 kg |
| Power: | watts |
| Launch Date: | 17 June 2021, 16:09 UTC |
| Launch Rocket: | Falcon 9 B1062.2 |
| Launch Site: | Cape Canaveral, SLC-40 |
| Launch Contractor: | SpaceX |
| Orbit Reference: | Geocentric orbit |
| Orbit Regime: | Medium Earth orbit (Semi-synchronous orbit) |
| Orbit Inclination: | 55.3° |
| Orbit Period: | 718.0 minutes |
| Apsis: | gee |
USA-319, also known as GPS-III SV05, NAVSTAR 81 or Neil Armstrong, is a United States navigation satellite which forms part of the Global Positioning System. It was the fifth GPS Block III satellite to be launched.[1]
SV05 is the fifth GPS Block III satellite. Satellite construction was completed in early 2021.
The spacecraft is built on the Lockheed Martin A2100 satellite bus, and weighs approximately .
SV05 is the 24th operational Military Code (M-Code) satellite to join the GPS constellation, the last required for M-Code Full Operational Capability.
USA-319 was launched by SpaceX on 17 June 2021 at 16:09 UTC, atop Falcon 9 booster B1062. This booster had previously launched SV04 a year prior.
The launch took place from SLC-40 at Cape Canaveral Space Force Station, and placed USA-319 directly into semi-synchronous orbit. About eight minutes after launch, Falcon 9 successfully landed on the droneship Just Read the Instructions.
As of 2023, USA-319 was in a 55.3 degree inclination orbit with a perigee of 20163km (12,529miles) and an apogee of .[2]