A small space mission does not become risk-free simply because its satellite is lightweight. It follows a shared trajectory, may collide with other objects, and may leave behind an inactive body if its end-of-life has not been prepared. ESA's 2026 report describes a growing volume of traffic and debris, based on data as of the end of 2025. The guidelines of the United Nations Committee on the Peaceful Uses of Outer Space set out debris mitigation practices. They are voluntary at the international level, which does not preclude requirements in national permits, contracts or regulations: these rules must be examined on a project-by-project basis.
The risk starts with the choice of orbit.
Before choosing an altitude for a slide, the team must estimate how many objects are passing through the region, at what speed, and with what trajectory uncertainties. Tracking data do not detect all small fragments. An evasive maneuver assumes that the satellite is still controllable, has power and possibly propulsion, that an alert is received in time, and that an operator can make a decision. A CubeSat without maneuvering capability does not have the same risk strategy as a larger satellite. Its small size does not make it invisible to the consequences of a collision.
The ESA report distinguishes between catalogued objects, estimates of smaller populations, and future scenarios. Mixing these categories produces spectacular but useless numbers. A visualization of thousands of points around the Earth is almost always a diagram in which the objects are magnified to be visible. Such an image should carry this disclaimer in its caption.
Preventing fragments of his own mission
The United Nations guidelines recommend, among other things, limiting debris released during normal operations, reducing the risk of rupture, and avoiding intentional destruction that creates fragments. At the end of life, it is also important to eliminate, as much as possible, sources of stored energy: residual fuel, batteries, or pressurized systems can contribute to a subsequent explosion. This work is often called passivation, and it must be built into the architecture, not added after loss of control.
The mission must also document how it will leave a crowded orbit: controlled re-entry when possible, natural decay justified by calculations, or other plan in accordance with applicable requirements. The ESA report mentions the transition from a 25-year objective to five years for certain low-Earth orbit end-of-life regimes. It would be wrong to make this a universal rule that applies identically to all missions and all states. The exact requirement depends on the technical and regulatory framework of the project.
A budget line, not a paragraph of goodwill
The debris plan has a cost: orbit studies, tests, tracking software, on-call personnel, backup fuel, or de-orbit components. It is necessary to define who follows the object after launch, who receives alerts, who can order a maneuver, and who manages the end of the mission. A university that outsources the launch still needs these answers. Contracts must specify the roles between the manufacturer, the operator, the launch provider, and the authority that grants the authorization.
The risk of re-entry to the Earth's surface also deserves attention. ESA has added an indicator for human risks associated with uncontrolled re-entry in 2026. The individual risk remains low, according to ESA, but the increasing number of objects makes it necessary to design for more complete combustion and to analyse trajectories. This issue is not solved by saying that an object is "small".
Follow the object even when the scientific mission ends
A payload may cease to produce images while the satellite remains in orbit. The end of data collection is not the end of operational obligations. Technical contact must be maintained long enough to manage residual power and execute the de-orbit plan if the systems permit. Prior to launch, the project must identify the minimum parameters to be followed: estimated position, electrical status, maneuvering capability, and the time at which re-entry or de-orbit will be initiated. A closure report must explain what was actually done, not simply reiterate the original intent.
If a failure prevents the planned maneuver, it is necessary to be able to estimate the remaining time of stay and communicate with the relevant authorities. The responsibility for declaring a space object and coordinating certain information is governed by specific legal frameworks; this text is not a legal opinion. It recalls that a university or a start-up company should seek such advice before signing a launch contract. Purchasing a seat on a rocket does not automatically ensure the orbital tracking of the payload.
Read the debris figures without distorting them
The ESA 2026 report summarizes observations up to the end of 2025 and also presents scenarios for the future. The statistic "more than three intact objects enter on average every day" describes a period and a method; it does not mean that three objects fall daily into a populated area. Collision projections depend on assumptions about future launches and compliance with mitigation measures. Citing them requires maintaining this framework, especially if one wants to convince a decision-maker to fund prevention.
We must also avoid a false opposition between African innovation and sustainability. A new mission can bring science and services while respecting a serious end-of-life plan. Conversely, the argument that there are few African satellites does not exempt each operator from good practices. Responsible choices made now are less costly than a late modification of the platform.
A design review prior to the launch contract
Before reserving a slot on a rocket, a team should be able to submit a sustainability case that is understandable to an external reviewer. It describes the intended orbit, known surrounding objects, maneuverability, energy margins, and end-of-life strategy. It quantifies the probabilities using the chosen method and identifies the assumptions that could change them. It also documents the battery and pressure system passivation, as well as ground tests that demonstrate the procedure can be performed. A plan simply declared "compliant" without calculations or an identified responsible party does not provide the same assurance.
The dossier should assign tasks after launch. Who follows up on convergence alerts during a weekend? Who retains control if the student team is renewed? Which actor is authorized to share the trajectory with monitoring networks and authorities? These organizational questions can be more difficult to resolve than choosing a small scientific sensor. They explain why the operating budget must last beyond the first data demonstration.
A culture of documented incidents
If a satellite loses contact or is unable to perform its planned end-of-life operations, communication should not be lost with the scientific mission. Publishing the known state, the uncertainty in the trajectory, and the measures being taken helps other operators manage the risk. A failure is not automatically a fault; hiding an inactive object or announcing an unperformed de-orbiting would, on the contrary, prevent collective learning. Major agencies publish reports and adjust their requirements based on these feedbacks.
For developing African programmes, this transparency can become an institutional advantage. It demonstrates that access to orbit and the safety of other users are taken seriously, without claiming that a single small mission will solve global space debris pollution.
What this changes – or does not change – for Central Africa
A fledgling African space program can incorporate sustainability into the training of engineers. A design exercise should include a life-cycle budget, energy margins, and a monitoring plan, along with the scientific payload. This does not mean that a Cameroonian institution is currently operating a mission that is exposed to such specific risks; rather, this paper sets out a framework for preparation. International texts provide principles, and the rules applicable to a given mission require separate legal verification before any authorization.
