Star Trackers
As the world leader in star trackers, Sodern offers the most extensive range of products on the market, suited to all types of missions, budgets, satellite platforms, and orbits.
From low Earth orbit to deep space, Sodern’s star trackers benefit from extensive flight heritage. They equip satellites operated by major space agencies and leading manufacturers, as well as New Space start-ups.
From low Earth orbit to deep space, Sodern’s star trackers benefit from extensive flight heritage. They equip satellites operated by major space agencies and leading manufacturers, as well as New Space start-ups.
Product range
Auriga™
A compact, off-the-shelf star tracker, ideal for constellations and small satellites
The Auriga™ star tracker is a true showcase of advanced technology, perfectly optimized for the smallsat market under 500kg and New Space projects from 6U upward.
Hydra
A robust, modular star tracker
Hydra is a star tracker available in numerous versions, offering both modularity and high performances. With exceptional quality and resilience, Hydra is deployed on major institutional and scientific missions from several countries, as well as on telecommunications and observation satellites across all orbits.
Horus
Single box star tracker
Horus is an autonomous and robust star tracker that leverages innovative technologies to deliver high performances and competitiveness in applications requiring a single field of view. Horus has notably been selected for use on telecommunications platforms developed by leading satellite manufacturers.
Which range is made for you?
 Auriga |  Hydra |  horus | |
|---|---|---|---|
| mission's orbit | LEO - MEO - GEO | LEO - MEO - GEO - DEEP SPACE | LEO - MEO - GEO - DEEP SPACE |
| satellite size | >6U | >12U | >12U |
| temporal noise xy,z | 11 / 70 arcsec | 2.3 / 18 arcsec | 3 / 22 arcsec |
| robustness in acquisition and tracking | ≤ 2 deg/S｜≤ 3 deg/S | ≤ 6 deg/S｜≤ 8 deg/S | ≤ 6 deg/S｜≤ 8 deg/S |
| single box star tracker | No | No | Yes |
Mission Blue Ghost 1
SCIENCE2025
The mission aims to study the lunar surface in greater detail and prepare for future human interventions. Blue Ghost is equipped with two optical heads and one electronic unit of the Auriga™ star tracker.
Constellation EutelSat OneWeb
TELECOM2019
OneWeb constellation, equipped with Auriga™ star trackers, comprises 600 low-Earth orbit communications satellites. It will provide high-speed internet access to individuals.
Mission NASA Europa Clipper
EXPLORATION2024
NASA mission dedicated to the study of Europa, one of Jupiter's moons. Hydra star tracker is on board , custom-designed to withstand Jupiter's high-radiation environment.
Mission NASA JPL SphereX
EXPLORATION2025
Sodern is contributing to NASA JPL's SphereX mission with Hydra star tracker, delivered to BAE Systems. SphereX will collect data on more than 450 million galaxies to explore the origins of the universe.
Mission NASA Lucy
EXPLORATION2016
NASA's Lucy spacecraft's goal, equipped with Hydra star tracker, is to study Jupiter's Trojan asteroids.
Missions NASA Goes S-R-U
METEOROLOGIE2016
Geostationary meteorological satellites equipped with Hydra star trackers. The mission provides information on Earth's atmosphere and ocean masses for the U.S. National Weather Service.
Mission DirecTV-15
TELECOMMUNICATIONS2015
Equipped with our Hydra star tracker, the DirecTV-15 satellite is a geostationary communication satellite. It provides telecommunications services to the continental United States, Hawaii, Puerto Rico, and Alaska.
