Satellites and subsystems > Attitude > Attitude sensors > Star trackers > Hydra Access
Key highlights
Hydra Access is the best trade-off between performance and price, as well as the first high-end star tracker available off-the-shelf (shortened lead-time).
It is a standardized version of the Hydra-CP high-end star tracker:
- Hydra Access is a centralized processing version up to 4 OH and is equipped with a HAS-2 CMOS sensor. It offers an acquisition time of less than 2 seconds and an attitude retrieval accuracy of approximately 1 arcsec.
- Hydra Access is designed with hardened, radiation-resistant lenses and is available with a 26° protective baffle.
Flight heritage
Hydra Access benefits from all of Hydra's heritage. Hydra’s first flight was in 2012. Since this date 80+ satellites have been launched with Hydra with a total of more than 200 OH.
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Last updated: 2024-04-17
Hydra Access
Technical specs
mechanical shock
2000 g
mechanical vibration
30 Grms
storage temperature
-40 to 70 C
operating temperature
-30 to 60 C
update rate
8 Hz
data interface
SpaceWire
power consumption
0.7 W @ 30°C, 5V OH: typ (TEC OFF)
power supply
5 V
lifetime
10 years LEO / 18 years GEO
sun exclusion angle
26 deg
slew rate
≤8 deg/s in Tracking
≤6 deg/s in Acquisition
≤6 deg/s in Acquisition
field of view accuracy
High Frequency Spatial Error @ 3σ: 3.4 arcsec (XY) | 27 arcsec (Z)
Low Frequency Spatial Error @ 3σ: 0.6 arcsec (XY) | 4.6 arcsec (Z)
Low Frequency Spatial Error @ 3σ: 0.6 arcsec (XY) | 4.6 arcsec (Z)
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