Terma

Terma A/S is an Aarhus, Denmark-headquartered defense and aerospace technology company founded in 1945 — originally producing radio equipment for the Danish military — that has evolved into a diversified provider of space electronics, defense electronics, and aerospace components for European and international customers, with the space division being one of its three major business lines alongside defense and aviation.

Terma's space products portfolio centers on high-precision star trackers — optical instruments that photograph star fields and autonomously identify star patterns against an onboard catalog to determine spacecraft attitude (orientation) with arc-second accuracy. Star trackers are a primary sensor in satellite attitude determination and control systems (ADCS), providing absolute attitude reference independent of drift or error accumulation that affects gyroscopic sensors over time.

Terma's T1 and HE-5AS star tracker families are flight-heritage products used on ESA missions including the Rosetta comet mission, Herschel space telescope, Planck cosmic microwave background observatory, BepiColombo (Mercury mission), JUICE (Jupiter Icy Moons Explorer), and numerous commercial and government satellites. The star trackers must operate reliably in the space radiation environment across temperature extremes while maintaining precise optical alignment.

Beyond star trackers, Terma develops satellite on-board computers (OBCs) — radiation-tolerant computing platforms running satellite management software for telemetry, command handling, fault detection and recovery, and payload data management. The company's OBC heritage includes systems on ESA missions and EUMETSAT meteorological satellites. Power conditioning electronics, data handling units, and harness assemblies for specific ESA missions round out the space electronics portfolio.

Terma also manufactures mission-specific structural and electronic assemblies for ESA science missions and Copernicus Earth observation satellites. The company participates in Ariane launch vehicle avionics and ground systems through European supply chain relationships.

In the defense sector, Terma is a major NATO-aligned defense electronics company providing radar systems, self-protection systems for military aircraft, and command and control software — giving Terma technological depth in electronics, signal processing, and radiation-hardened computing that directly benefits the space product line. Competitors in space star trackers include Ball Aerospace, Jena-Optronik (Germany), Leonardo (Italy), and Sodern (France).