Vega-C Launch of SMILE Mission Postponed by Avio Due to Technical Issue

The launch of the SMILE (Solar wind Magnetosphere Ionosphere Link Explorer) mission, a collaborative effort between the European Space Agency (ESA) and the Chinese Academy of Sciences (CAS), originally scheduled for April 9, 2026, aboard the European Vega-C rocket's VV29 mission, has been postponed. Avio announced the delay on April 5, explaining that it was caused by a technical issue identified during the production of a subsystem component. This problem surfaced after the rocket had already been fully assembled.

As a result, additional rigorous checks are now required. The primary objective is to determine whether the production line fault also affects the Vega-C rocket currently prepared for launch. Only after these comprehensive verifications can the system be confirmed as safe for flight, allowing for a new launch date to be set.

SMILE is a mission designed to uniquely study the interaction between the Sun and Earth's magnetic field in X-ray and ultraviolet wavelengths. Its goal is to gain a deeper understanding of how solar wind impacts Earth's magnetosphere. The launch window for this crucial mission is set to close on May 7.

Ongoing Investigations

Specific details about the component involved have not yet been released. However, Avio has confirmed that both the Vega-C launcher and the SMILE satellite remain in safe condition. This postponement comes at an advanced stage of the launch campaign; operations at Kourou commenced in mid-February with the transfer of the P120C first stage to the launch pad. By early April, the satellite, already encapsulated within its fairing, had been integrated, signifying the completion of the primary pre-launch activities.

The issue was identified on a supplier's production line, and thorough checks are currently underway to ensure the same problem is not present on the rocket that is already prepared for flight.

Avio has indicated that a new launch date will only be announced once these critical controls are finalized, which are essential for confirming the system's flight readiness. This situation also arises at a particularly sensitive time for the launcher's program, as this specific Vega-C flight is set to be the first to be operated entirely by Avio, following the full transfer of responsibilities from Arianespace, completed in 2025.