Hydra is a multiple-head star tracker with separate optical heads and electronic units. Thanks to its high degree of modularity, Hydra can be tailored to suit the need of each customer. Exceptionally robust, Hydra can survive high environment levels and deliver accurate attitudes under very harsh conditions such as high slew rates, protons and stray-light.

Hydra is a star tracker which provides modularity and performance thanks to a wide range of versions, providing exceptional quality and resilience. Hydra electronic units are diverse and available in 4 versions with multiple-head management:

  • Hydra Baseline: The most versatile version with a configuration up to 4 optical heads connected to 2 electronic units, with up to 8 m long cable.
  • Hydra TC: 2 OH & 2 EU in one single box, with performance equivalent to Baseline and the best compromise for Geostationary satellites.
  • Hydra M: Up to 3 OH & 2 EU, optimized for lower power, most light version of the Hydra family (1.35 kg/EU).
  • Hydra CP: Up to 3 OH, centralized processing version with its software implemented in the satellite’s OBC.

Additionally, Hydra Custom is an offering for specific configurations for complex missions, where dedicated development is necessary. As an example, specific shieldings and radiation hardening design can be implemented on hydra, like the JUICE mission or EUROPA CLIPPER missions.


Key features

  • Hydra also consists of lenses made of radiation-hardened glasses as well as HAS-2 (CMOS) detector with a thermo-electric cooler.
  • It has baffle protection for direct sun and earth illumination and its electronic unit's lifetime can be extended with additional shielding for GEO missions.

Flight 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



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