Celeste launched into orbit: Europe is building satellite navigation in low Earth orbit for the first time
On March 28, Europe made an important step forward in the development of its own satellite navigation. At 10:14 Central European Time, the first two satellites of the Celeste mission lifted off from Rocket Lab’s complex on the Māhia Peninsula in New Zealand aboard an Electron rocket, officially marking the start of the first European demonstration of a positioning, navigation and timing system in low Earth orbit. It is a project of the European Space Agency, ESA, conceived as a complement to the existing European navigation system Galileo, which operates from medium Earth orbit. Unlike the previous model, Celeste is testing how satellites flying significantly closer to Earth could increase the resilience, availability and overall capabilities of European navigation services. The launch was carried out successfully, and the satellites separated from the rocket approximately one hour later, after which the early operations phase and preparation of the systems for life in orbit began.
Why Celeste is important for Europe
The Celeste project is important in the European space sector for several reasons. Above all, it is the first European initiative attempting to bring satellite navigation into low Earth orbit, a region at an altitude of approximately 500 to 600 kilometres. This does not replace Galileo, but examines the possibility that Europe could in the future develop a multilayer navigation system in which different orbits would work together. ESA openly states that the goal is to create a more resilient and robust positioning, navigation and timing system, especially in circumstances when signals from higher orbits may be weakened, obstructed or exposed to interference. In practice, this means Celeste should not be viewed as competition to Galileo, but as its potential new layer, one that could give the European system additional security and greater flexibility. At a time when navigation services are no longer tied only to the classic determination of position on a map, but also to transport, industry, telecommunications, energy, financial transactions and emergency services, such a move has both technological and geopolitical weight.
Today, the European space programme relies on Galileo as the European Union’s global satellite navigation system and on EGNOS, the European system for improving the precision and reliability of navigation signals. Celeste is entering precisely that space as an experimental but strategically important addition. ESA states that flying closer to Earth could ensure stronger signals, better availability in complex environments and open the door to new types of services. This is particularly important for urban areas with tall buildings, for remote polar and Arctic regions, but also for situations in which high resistance to jamming and interference is essential. In the European institutional framework, such logic gains additional weight because the question of navigation is no longer only a matter of user convenience, but also a matter of strategic autonomy.
How the mission began and what was launched
The first stage of the mission consists of two large CubeSats, one of size 12U, the other 16U. They were developed by two European industrial consortia: one led by the Spanish company GMV, the other by the French company Thales Alenia Space, with the participation of numerous partners from several European countries. ESA points out that this is an approach inspired by the so-called New Space development model, which places emphasis on faster development cycles, greater agility and the gradual reduction of technical risk through several development phases. That is precisely why the first two satellites have a dual task. On the one hand, they must confirm in real orbital conditions that the selected technologies and signals work as planned. On the other hand, they must secure the regulatory and frequency prerequisites for expanding the mission to a full demonstration constellation.
Rocket Lab announced that satellites IOD-1 and IOD-2 were deployed into low orbit at an altitude of 510 kilometres. ESA then states that these first satellites are opening the period of early operations, during which the systems are activated, checked and prepared for the main experimental part of the mission. Their role is to validate key technologies, new signals and future service capabilities, especially in the L- and S-bands. That part is not important only from the technical side. In space infrastructure, the radio-frequency spectrum represents a limited and strictly regulated resource, so satellite networks must demonstrate the actual use of assigned frequencies in accordance with the rules of the International Telecommunication Union. That is precisely why ESA stresses in its official materials that the first satellites will help bring the necessary frequencies into use for the operational phase of the mission.
What Celeste can bring to users
The most important question for end users is whether such technology will one day be felt in everyday life. According to what ESA is communicating today, the answer is yes, but with the important caveat that Celeste is still in the demonstration phase. Its basic purpose is to prove that low orbit can offer navigation advantages that current systems cannot provide to the same extent or cannot provide equally reliably in all conditions. Since satellites in low orbit are closer to users on Earth, the signal can be stronger and, in some scenarios, more resilient as well. This is relevant for autonomous vehicles, railway systems, maritime and air transport, the management of critical infrastructure, the synchronisation of telecommunications networks and a large number of applications connected with the Internet of Things.
The special value of Celeste could prove itself where classic GNSS signals have limitations. In dense city centres, the signal can reflect off buildings and lose reliability. In indoor spaces or in demanding geographical areas, such as northern latitudes, service quality can also fluctuate. ESA therefore explicitly mentions among possible future applications better availability in urban canyons, a greater presence of service in remote polar and Arctic regions, improved positioning and message exchange with emergency services during disasters, tracking of connected devices and even indoor navigation. For now, these are experimental goals, but the list shows how wide a range of uses Europe is trying to cover with a single project.
From demonstration to a constellation of 11 satellites
Celeste is not conceived as a one-time demonstration with two satellites. According to ESA’s plan, the current phase represents the first step toward a demonstration constellation of a total of 11 satellites. From 2027 onward, the mission should be joined by eight more larger satellites with additional capabilities, and one more satellite should carry miniaturised atomic clocks and other technologies. That would greatly expand the range of experiments. In addition to the L- and S-bands, future satellites should enable demonstrations in the C-band and the UHF range, as well as two-way functionalities and more advanced signal integrity monitoring. ESA expects that this next phase will provide a more realistic picture of whether the transition can be made from demonstration toward a pre-operational, and one day perhaps operational, European LEO navigation component.
It is also important that Celeste was institutionally strengthened at the ESA ministerial council in 2025. At that time, the next preparatory phase of the mission in orbit was supported, which should serve for technological development, industrialisation and the validation of solutions needed for a possible future operational system. ESA openly states that the results of the mission should help European industry and support future decisions of the European Union on the possible establishment of an operational navigation layer in low Earth orbit, as a complement to Galileo and EGNOS. In other words, Celeste today is not a finished system for the market, but it is a concrete step in the direction of a European decision on what navigation should look like in the decade to come.
Industrial and political framework of the project
Behind the mission there is not just one laboratory or one space company, but a broad European industrial and political network. ESA states that the development of the fleet is taking place through two parallel contracts and that the consortia include more than 50 entities from more than 14 European countries. Such a structure shows that Celeste is not a narrow technological experiment, but also an industrial programme aimed at retaining and developing competencies within Europe. In a period of intensified global competition for dominance in space services, the ability for Europe to independently develop and test new navigation architectures is becoming an important element of economic and security policy.
The project is also linked to ESA’s new European Resilience from Space initiative, within which Celeste is mentioned as one of the fundamental pillars of resilience from space. Such a framework should not be read merely as a rhetorical upgrade. In recent years, there has been increasing discussion of the vulnerability of navigation and communication systems to jamming, spoofed signals and other forms of hybrid threats. In that context, Europe wants to have a greater choice of technological solutions and stronger resilience of key services. Navigation is no longer invisible infrastructure that citizens take for granted. It has become part of the security architecture of modern states, from traffic management to the synchronisation of digital systems and the work of emergency services. That is why Celeste, although still experimental, has a much broader political significance than the ordinary launch of two small satellites.
What follows after the launch
After the successful liftoff, the real work is only beginning. Early operations in space missions include checking the satellites’ basic health status, establishing control over the platform, activating and calibrating subsystems and preparing the payload for operational experiments. Only after that phase can one speak with greater confidence about the scope and dynamics of testing. ESA currently points out that the first two satellites will validate key technologies, new signals and service capabilities and help activate the necessary frequency bands for the continuation of the mission. This means that the first concrete technical results will only begin to arrive as the satellites stabilise in orbit and move from the initial to the working phase.
At the same time, the success of this launch already has symbolic and operational weight. Symbolic, because Europe has for the first time shown that it is seriously building its own concept of navigation from low orbit. Operational, because this has opened the door to the next launches and to a broader experimental programme. If the demonstrations confirm expectations of a stronger signal, better availability and greater resilience, Celeste could become one of the foundations of a future European navigation architecture in which there will no longer be reliance on only one orbital level. At a time when space systems are becoming ever more strongly linked with the economy, transport, security and everyday digital services, the launch from New Zealand on March 28 does not appear as an isolated technical event, but as the beginning of a process through which Europe is trying to redefine how position, time and the reliability of signals relied upon by millions of users will be ensured in the future.
Sources:- European Space Agency (ESA) – official announcement on the successful launch of the first two satellites of the Celeste mission and the start of the early operations phase link
- European Space Agency (ESA) – overview of the Celeste mission, the planned constellation of 11 satellites and the role of the project within the FutureNAV programme link
- European Space Agency (ESA) – technical overview of the demonstration constellation, types of satellites, orbit and expansion plans from 2027 link
- European Space Agency (ESA) – confirmation of the targeted launch date, description of the first satellites, the L- and S-bands and the preparatory phase toward a possible operational system link
- Rocket Lab – official page of the Daughter Of The Stars mission with data on launch time, the Electron launch vehicle, location and the 510-kilometre orbit link
- EU Space Programme – official overview of the European space programme in which Galileo and EGNOS are defined as key components of European space infrastructure link
- EUSPA – official overview of the EGNOS system and its role in improving the precision and reliability of satellite navigation link
- ITU – official overview of the regulatory framework for satellite systems and the use of radio-frequency spectrum in the international environment link
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