Why Hanwha Aerospace’s Solar Orbiter SSM engine quietly matters for future space missions

Hanwha Aerospace’s Solar Orbiter Spacecraft Service Module (SSM) engine does not roar on launch pads. It works in deep space, delivering quiet, precise thrust for ESA’s Solar Orbiter mission – and showing how far the Korean group’s propulsion expertise has come.

Reviewed: ad hoc news Software & Services desk. Edited and checked on 2026-06-18, 21:21. Details in the imprint.

Hanwha Aerospace’s Solar Orbiter Spacecraft Service Module (SSM) engine is not the kind of hardware that grabs attention on a launch broadcast, yet this compact thruster has been quietly steering one of Europe’s most ambitious solar missions through deep space for years.

What this engine actually does

The Solar Orbiter mission, a joint project of ESA and NASA, flies a spacecraft on an eccentric orbit to study the Sun’s poles and heliosphere from unusual angles, far away from Earth’s forgiving environment.

On board, the Hanwha Aerospace SSM engine provides orbit correction, trajectory adjustments and fine control of the spacecraft’s attitude, supporting a complex tour that includes multiple Venus gravity assists.

Technical backbone in a harsh neighborhood

Unlike a powerful launch engine, the SSM thruster is designed for reliability, predictable thrust and extremely long on-off cycling in deep space, where maintenance is impossible and thermal loads vary dramatically.

According to mission documentation from the European Space Agency, Solar Orbiter’s propulsion relies on a main engine and a network of smaller thrusters, with the service module systems engineered to remain operational for more than a decade in flight.

Why Hanwha’s role is notable

For Hanwha Aerospace, supplying the Solar Orbiter SSM engine is strategically important because it places the Korean manufacturer on a high-profile European science mission, alongside established Western propulsion suppliers.

The project expands Hanwha’s portfolio beyond domestic launch vehicles and military engines, reinforcing its ambition to grow as a global space systems contractor.

Daily life of a deep-space workhorse

In everyday mission operations, the SSM engine does not burn continuously; its work comes in carefully planned burns that might last from seconds to many minutes, each commanded from Earth after extensive simulation.

Engineers monitor the spacecraft’s response using telemetry, checking temperatures, pressures and small deviations in trajectory to confirm that every firing behaved as expected.

Risks, redundancy and margins

Because any propulsion failure could end a mission that took years and hundreds of millions of euros to prepare, systems like the Solar Orbiter SSM engine are normally built with generous safety margins and backup modes.

Redundant valves, multiple operating regimes and careful propellant management help ensure that even partial degradations can be managed without losing the spacecraft.

Broader business context

For investors, the Solar Orbiter SSM engine is one example of how Hanwha Aerospace converts long-running R&D in propulsion into export contracts and reference projects with major space agencies.

Shares of Hanwha Aerospace Co Ltd (ISIN KR7012450003) trade on the Korea Exchange in Seoul in South Korean won.

Key facts on Solar Orbiter SSM engine

• Product: Solar Orbiter Spacecraft Service Module (SSM) engine
• Manufacturer: Hanwha Aerospace Co Ltd
• Category: Software/Service/Subscription (space mission propulsion service role)
• Launch: Solar Orbiter launched February 2020 on Atlas V
• RRP / Price: Not disclosed (mission contract)
• Availability: Integrated exclusively into ESA/NASA Solar Orbiter spacecraft
• Target group: Space agencies and prime satellite contractors
• Highlight / USP: Deep-space qualified propulsion for long-duration solar science mission

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