Final in-orbit-demonstrators launched to validate direct to Earth optical links in close out of ESA-implemented Greek Connectivity Programme

04 May 2026

The European Space Agency (ESA) has supported the launch of two satellites in the Hellenic Space Dawn mission, the final CubeSat mission in the Greek Connectivity Programme implemented by ESA on behalf of the Hellenic Ministry of Digital Governance. The Hellenic Space Dawn satellites were launched to low Earth orbit on a SpaceX Falcon 9 from Vandenberg Space Force Base, California, at 08:00 a.m. BST (09:00 a.m. CET) on 3 May 2026.

Hellenic Space Dawn comprises two 8U-size CubeSats, HELIOS and SELENE, managed by EMTECH SPACE and equipped with CubeCAT laser communication terminals provided by AAC Clyde Space. This mission will also carry high-resolution cameras with the intention of leveraging optical links to enable low-latency support for applications such as cartography and land-use monitoring. In addition, the satellites will support the validation of in-space data processing hardware as well as a radiofrequency inter-satellite links. Once operational, this mission will validate robust direct to Earth (DTE) optical links, offering significant improvements over conventional radio frequency systems for transmission speeds and resistance to interference.

Hellenic Space Dawn is the culmination of the space segment in the Greek Connectivity Programme, an ambitious programme initiated in 2023 to fast-track Greek In-Orbit Demonstration (IOD) missions. Implemented by ESA with funding from the European Union, the programme aims to boost the country’s space industry – from design, manufacturing, operation and ground station communications – and strengthen its place in the European space ecosystem.

Hellenic Space Dawn is the last of the seven IOD missions in the programme. Alongside three similarly specialised missions launched earlier this year, Hellenic Space Dawn will help to validate next-generation optical terminals in support of Greece’s expanding capabilities in resilient optical communication technologies. Altogether, the seven IOD missions in the Programme feature a total of 11 satellites launched to low Earth orbit between 2025 and 2026. Each spacecraft is currently either performing its nominal mission or progressing through its Launch and Early Operations Phase (LEOP) during which its operators meticulously check the satellites’ systems’ health in anticipation of commissioning and commencement of normal mission operations.

Together with the expected completion of the Hellenic Assembly, Integration and Testing Facility (HAITF), as well as multiple optical ground stations, the IOD missions contribute to building up the country’s end-to-end space capabilities and foster competitive European solutions.