| NEXTAR NX-300L | |
| Manufacturer: | NEC Space Systems |
| Country: | Japan |
| Applications: | Earth observation |
| Spacecraft Type: | Earth observation |
| Design Life: | 3 to 5 years |
| Dry Mass: | 250kg (550lb) |
| Payload Capacity: | up to 250kg (550lb) |
| Dimensions: | 950x (W×D×H) |
| Power: | Up to 600 W |
| Batteries: | Li-ion |
| Orbits: | Low Earth orbit |
| Status: | In Production |
NEXTAR (from NEC Next Generation Star) is a Low Earth orbit Earth observation satellite bus designed and manufactured by NEC Space Systems of Japan. This three axis stabilized platform has a bus dry mass of 250kg (550lb), it can carry payloads up to 250kg (550lb) and 600 W. It uses tri-junction GaAs has an expected life between 3 and 5 years.
Its telemetry and control subsystem includes S band and X band channels.
As of 2014, there are three different models of the NEXTAR standardized platform. All feature a common core of features like using the SpaceWire communications protocol, the SpaceCube2 on-board computer and autonomous control functions. The different models are:
Satellites using the NEXTAR platform.