What exactly does a national STM authority do that a commercial provider cannot?

A national STM authority holds legal standing to license operators, compel compliance, engage diplomatically with foreign states through COPUOS and bilateral channels, and integrate classified sensor feeds into civil conjunction services — none of which a commercial data broker can do. It is the difference between advisory influence and enforceable jurisdiction. Commercial providers such as LeoLabs or ExoAnalytic Solutions supply excellent tracking data; a sovereign authority is the institution that acts on it with legal weight.

Can't we just rely on the US 18th Space Defense Squadron's free conjunction data?

Space-Track.org provides a genuinely valuable public service, but its data reflects US national security priorities, is subject to unilateral access policy changes, and carries no obligation to serve foreign operators' interests first. Dependence on it means your nation's orbital risk decisions are made using data and thresholds set by another government. A sovereign STM capability lets you validate, supplement, or challenge those assessments with your own sensors and algorithms.

How many sensors does a credible national tracking network actually require?

There is no single threshold, but peer-reviewed analysis suggests a minimum viable LEO surveillance network needs at least three geographically distributed radar sites (ideally spanning 60° of longitude) combined with two or more optical telescopes for GEO belt coverage. ESA's Space Surveillance and Tracking (SST) programme, which pools assets across 15 member states, operates roughly 30 sensors collectively — illustrating that even wealthy regions prefer pooling to solo acquisition.

What is the legal basis for a state to regulate foreign operators passing through 'its' orbital slots?

Outer space is not sovereign territory under the 1967 Outer Space Treaty, so a state cannot claim exclusive orbital slots the way it claims airspace. What it can do is: (a) register and license its own nationals' spacecraft under Article VI of the OST, (b) coordinate ITU frequency assignments that effectively reserve spectrum/slot combinations, and (c) negotiate bilateral or multilateral STM agreements that create reciprocal compliance obligations. The ITU Radio Regulations Article 9 coordination process is the closest existing mechanism to 'slot governance'.

What is the standard probability-of-collision threshold at which operators are expected to manoeuvre?

NASA's conjunction assessment handbook recommends a 1-in-1,000 (1×10⁻³) Pc threshold as the trigger for manoeuvre planning, while many commercial operators use 1-in-10,000 (1×10⁻⁴) as a conservative action threshold. There is currently no binding international standard — one of the core governance gaps that a national STM authority, engaging through COPUOS, can help close by advocating for harmonised rules.

How does a national STM authority interface with ESA's SST or the US CSpOC?

Formal interfaces are established via data-sharing agreements — the EU SST Consortium, for example, operates under EU Space Programme Regulation 2021/696 and shares processed conjunction data with operators through national access points. Bilateral US agreements flow through the Space Situational Awareness data-sharing programme administered by the US Space Force. A national STM authority needs standing technical and legal agreements with both channels, plus its own independent verification capability to avoid becoming purely a relay node.

What happens to a nation's licensed satellites if it has no STM authority and a collision occurs?

Under Article VII of the 1967 Outer Space Treaty and the 1972 Liability Convention, the launching state is absolutely liable for damage caused by its space objects on Earth's surface and liable on a fault basis in orbit. Without a functioning STM authority, a government cannot demonstrate due diligence — exercising 'continuing supervision' required under OST Article VI — leaving it legally and financially exposed for third-party collision damages that could run into the hundreds of millions of dollars.

Is a microsatellite constellation a realistic sensor backbone for a national STM authority?

For radar — no, not yet; phased-array radar remains mass- and power-intensive. For optical tracking and radio-frequency emission monitoring (detecting propulsion events, beacon signals), yes: companies such as HawkEye 360 already demonstrate RF-based space object characterisation from smallsats. A national programme can credibly combine a small ground-based radar network with a LEO microsatellite optical and RF constellation to achieve sovereign, multi-layer space domain awareness at a fraction of traditional costs.

14.1.5Live

National STM Authority Operations

Technicians at computer consoles in a government space operations control room monitoring orbital tracking screens — An air traffic control tower marked 28 anchors the coordinated oversight that satellite tracking brings to national STM authority.

National STM Authority: Satellite Tracking to Decision

1
Orbital Assets
Satellites transmit position, status telemetry continuously
2
Ground Network
Radar and optical sensors collect tracking data
3
STM Processing Hub
National authority fuses, models conjunction risk
4
Operator Decision
Manoeuvre alerts issued to licensed operators

Ground sensors feed a national STM authority that processes conjunction risk and issues collision-avoidance directives to satellite operators.

Page in the build queue

This application has its place in the atlas. The full page — short and long descriptions, what-matters bullets, sovereignty rationale, and the eight-field architecture block — is being written next.

Maturity reading: Operational systems exist with paying customers. Phase 1 built §4.1 (Maritime Intelligence) end-to-end as the depth-and-format reference. Section 4 is the next section to graduate from scaffold to full content; the rest follow on the roadmap.

Related applications

14.1.4 · Previous

STM Standards & Interoperability

All in space traffic management

Bring this into your sovereign programme.

All solutions Speak with engineering