14.1.2 — Space Traffic Management — maturity: live

Catalogue Maintenance

Continuously tracking, identifying and updating the orbital state vectors of every catalogued object in Earth orbit using ground-based and space-based sensors.

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Every satellite operator, military planner and launch authority depends on a shared picture of what is in orbit and where it is going. Today that picture is almost entirely produced by the United States Space Surveillance Network and shared—selectively—through Space-Track.org. Nations that rely exclusively on this feed inherit both its coverage gaps and its political conditions: data can be withheld, degraded or discontinued at any diplomatic inflection point, and the catalogue itself omits classified US objects by design.

A sovereign catalogue maintenance programme closes that dependency with a layered sensor network: ground-based phased-array radars for low-altitude debris down to 10 cm, optical telescopes for GEO-belt objects, and a space-based SSA constellation for the large blind spots between latitudes that ground sensors cannot reach. Fusing these inputs into a continuously updated state-vector catalogue—with independently computed uncertainty ellipsoids—gives the nation an authoritative, unredacted picture of its orbital neighbourhood. That picture feeds directly into conjunction assessment (§14.1.1) and manoeuvre coordination (§14.1.3) without passing through a foreign chokepoint.

Operationally, the outcome is legal and strategic autonomy. When a debris cloud threatens a national asset, the decision to manoeuvre should rest on data the nation controls, not a TLE issued at the discretion of a foreign space command. As orbital congestion accelerates—with megaconstellation filings now exceeding 100,000 objects—nations that cannot independently verify catalogue data will find themselves increasingly dependent on the goodwill of whoever runs the authoritative register.

What matters

US Space-Track.org intentionally omits classified US objects and can restrict access to foreign nationals under ITAR and EAR controls.
A 10 cm radar-detectable object impacting a satellite at 7.5 km/s releases energy equivalent to a hand grenade; catalogue completeness is a survivability issue.
Catalogue freshness degrades fast: a TLE for a LEO object is unreliable for conjunction use after 48–72 hours without an update, making latency a critical operational parameter.
Nations hosting launch sites or operating large constellations face emerging liability exposure under the Outer Space Treaty if their catalogue data is demonstrably inadequate.

Sovereignty score: 9/10 — A nation without its own orbital catalogue is operationally blind and geopolitically subordinate whenever its space assets are threatened.

US ITAR and EAR controls can restrict or condition foreign access to Space-Track data at any time, removing the catalogue as a reliable operational resource precisely when tensions are highest.
Outer Space Treaty Article VI assigns states continuing responsibility for national space activities; defending that responsibility in arbitration or liability proceedings requires independently verified tracking data, not foreign-issued TLEs.
Megaconstellation operators (Starlink, OneWeb, Amazon Kuiper) submit their own ephemeris data through national regulators—nations without sovereign tracking cannot independently validate or dispute those submissions.
Any future national STM authority (§14.1.5) issuing avoidance advisories or collision warnings that carry legal weight must ground those advisories in a catalogue it owns, audits and can certify in court.

Reference architecture

Payload: Space-based: S-band and X-band active electronically scanned array (AESA) radar, 1–3 m object detection threshold at 1,000 km range, 500 km swath; secondary visible/NIR optical sensor, 30 cm aperture, for GEO-belt survey passes
Bus class: ESPA-class microsat, 150–220 kg wet mass, 600 W solar array, cold-gas propulsion for station-keeping; ground radars are sovereign infrastructure—phased-array UHF/L-band for LEO debris (10 cm floor), 1.5 m optical telescopes at two distributed dark-sky sites for GEO
Orbit: Space-based SSA constellation: 12-satellite Walker Delta 60°/12/1 at 600 km LEO for polar and mid-latitude coverage; GEO optical survey telescopes remain ground-based; consider a single HEO (Molniya, 63.4° inclination) sensor for high-latitude blind-spot coverage
Ground segment: Three national ground stations (UHF TT&C + X-band data downlink); two dedicated radar fence sites with 3,000 km instrumented range; sovereign optical telescope network at geographically separated dark-sky locations; SatNOGS network as low-cost supplemental TT&C backup
Software & data
Latency
Cost band
Lead time

References

Space-Track.org — 18th Space Defense Squadron Catalogue — The US 18th Space Defense Squadron maintains the publicly accessible TLE catalogue via Space-Track.org. Access is subject to user agreements that permit selective restriction for national security reasons.
ESA Space Debris Office — Space Debris by the Numbers — ESA estimates over 36,000 objects larger than 10 cm are in Earth orbit, with only a fraction tracked in publicly available catalogues. ESA's own TIRA radar and optical network provide independent European tracking data.
UNOOSA — Long-term Sustainability of Outer Space Activities Guidelines — The UN Committee on the Peaceful Uses of Outer Space (COPUOS) adopted 21 guidelines in 2019 for long-term sustainability, several of which call on states to improve space object tracking and catalogue-sharing capabilities.
NASA Orbital Debris Program Office — Measurement Activities — NASA ODPO documents ground-based radar and optical measurement programmes used to characterise the debris environment. The office notes significant incompleteness in publicly available catalogues below 10 cm.
ITU Radio Regulations — Space Object Identification and Frequency Filing — ITU frequency coordination for satellite networks requires accurate orbital slot data; discrepancies between ITU filings and actual tracked positions create interference and liability ambiguities that a national catalogue can help resolve.