Why can't my country simply rely on the US Space-Track catalogue for free?

Space-Track.org provides a publicly accessible catalogue under a terms-of-service agreement that the US government can revoke or restrict at any time, as it has done during sensitive geopolitical moments. A sovereign nation relying solely on that feed has no independent verification capability and cannot act if the data is delayed, degraded, or withheld. Building even a complementary national sensor and processing layer restores decision-making autonomy.

What sensors does a national catalogue actually require?

A minimal sovereign capability typically combines at least one phased-array radar (for LEO objects down to ~10 cm) with one or more electro-optical telescopes (for higher-altitude, slower-moving objects). Increasingly, nations add space-based tracking payloads hosted on their own satellites and subscribe to commercial SSA data from providers such as LeoLabs or ExoAnalytic to fill coverage gaps between ground stations.

How often does the catalogue need to be updated?

Best practice for operational conjunction screening is to refresh state vectors at least every 8 hours for active LEO satellites and every 24 hours for debris. High-activity corridors — such as the 550 km shell now heavily populated by Starlink — benefit from continuous tracking with update rates below 2 hours. Stale data beyond 48 hours makes probability-of-collision estimates unreliable.

Is a national catalogue useful if my country only operates a handful of satellites?

Yes. A sovereign catalogue underpins regulatory authority: a nation cannot credibly license operators, enforce debris-mitigation rules, or issue flight-safety directives without independent situational awareness. It also creates diplomatic leverage — data-sharing agreements with larger space powers are far more reciprocal when your country brings sensor coverage they lack, such as equatorial or southern-hemisphere geometry.

How does the ITU registration process relate to catalogue maintenance?

ITU frequency coordination requires operators to submit orbital parameters, but ITU registration is not the same as active tracking. A nation's catalogue must independently observe, correlate, and maintain tracks to verify that filed orbital slots are actually occupied as declared, and to detect unregistered launches by any party. The two systems are complementary, not interchangeable.

What is 'covariance realism' and why does it matter for a national catalogue?

Covariance realism refers to how accurately the uncertainty ellipsoid around a tracked object's position is estimated. An overconfident (too small) covariance causes dangerous conjunctions to be dismissed as low-risk; an over-inflated covariance triggers unnecessary manoeuvres. Most current catalogues, including publicly available TLE-derived products, have poorly calibrated covariances, which is why sovereign sensor networks calibrated against known objects produce more actionable conjunction alerts.

Can commercial SSA providers replace a national catalogue entirely?

Commercial providers such as LeoLabs, ExoAnalytic, and Slingshot Aerospace offer high-quality data, but contracting with them transfers the dependency from one foreign government to a foreign corporation. Service contracts can be terminated, prices can rise, and proprietary algorithms are not auditable. A sovereign nation should use commercial data as a complementary feed, not as its sole source, to maintain independent verification and regulatory credibility.

What orbit is best for space-based tracking payloads that support catalogue maintenance?

Space-based sensors for catalogue maintenance are typically placed in low-inclination LEO (400–600 km) or in SSO to maximise coverage of the densely populated LEO shells. Some nations are exploring hosting tracking payloads on existing government satellites at MEO or GEO altitudes to cover the higher orbital regimes. The CCSDS ODM standard ensures that tracking data from these payloads can be ingested into ground-based catalogue systems regardless of operator.

14.1.2Live

Catalogue Maintenance

Control room operators watching multiple radar tracking screens displaying object trajectories — Control room operations viewed from above mirror the vigilance needed to keep satellite catalogues accurate and orbits safe.

Satellite Catalogue Maintenance: Observe to Update

1
Sensor Network
Radar and telescopes detect orbital objects
2
Observation Feed
Raw tracking data downlinked every pass
3
Catalogue Processing
Orbit determination updates 27,000+ entries
4
Operator & Alerts
Conjunction warnings issued to satellite operators

Ground sensors continuously feed raw observations into processing systems that refresh the global debris catalogue and flag collision risks.

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

14.1.1 · Previous

Conjunction Assessment & Avoidance

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14.1.3 · Next

Manoeuvre Coordination

Bring this into your sovereign programme.

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