15.5.1 — Asteroid Monitoring — maturity: experimental

Near-Earth Object Tracking

Continuously surveying near-Earth space to detect, catalogue and characterise asteroids and comets whose trajectories bring them within threat range of Earth.

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Every nation on Earth shares the same sky, but not every nation has a seat at the table when impact risk decisions are made. The global NEO catalogue is dominated by a handful of US-funded survey programmes — Catalina Sky Survey, Pan-STARRS, ATLAS — meaning the discovery, designation and threat-assessment pipeline runs through American institutions and is subject to American policy priorities. A sovereign space programme that contributes its own detection cadence earns independent verification rights and a direct voice in any internationally coordinated deflection or civil-defence response.

A dedicated space-based NEO survey constellation sidesteps the fundamental limitation of ground telescopes: the atmosphere, daylight and weather. Infrared-capable smallsats in a Venus-like interior orbit or in a high-inclination LEO can sweep the sky with cadences and solar-elongation coverage impossible from the ground, detecting sub-100m objects weeks earlier than any ground survey can. The payload stack — a wide-field thermal-infrared imager combined with visible-band optical — yields both discovery and size estimation in a single pass, allowing rapid threat triage without waiting for follow-up observatories.

The operational output is a sovereign-controlled NEO catalogue updated in near-real-time and fused with international datasets at the nation's discretion. Civil defence planners receive impact probability corridors with independent uncertainty bounds — not inherited from a foreign agency. When a credible impactor is identified, the sovereign state can brief its population, initiate evacuation planning and engage diplomatically from a position of verified knowledge rather than borrowed intelligence. That distinction matters enormously when the object in question has a 1-in-1000 chance of hitting your territory.

What matters

Objects under 140m diameter — capable of destroying a city — remain largely uncatalogued; space-based IR surveys are the only practical way to close that gap within a decade.
The UN-mandated International Asteroid Warning Network (IAWN) relies on voluntary national contributions; nations that observe independently hold proportionally more influence over joint response decisions.
Impact prediction corridors narrow dramatically with each additional independent astrometric data arc — sovereign observations can shorten evacuation decision timelines by days.
A deflection mission (kinetic impactor, gravity tractor or nuclear option) requires months to years of lead time; late detection caused by survey gaps is an unrecoverable failure mode.

Sovereignty score: 9/10 — A nation that cannot independently detect and characterise a threatening NEO is entirely dependent on foreign agencies for the information that could determine whether to evacuate its cities — that dependency is strategically unacceptable.

Impact risk communication is politically explosive; a government that learns of a credible threat via a foreign press release rather than its own sensors loses both credibility and response time.
US export controls (ITAR/EAR) restrict access to the most sensitive astrometric software, high-performance IR focal-plane arrays and the full NEO risk databases maintained by JPL — sovereign observation capability is the only guaranteed workaround.
Deflection mission authorisation will be negotiated through the UN Space Mission Planning Advisory Group; nations with independent survey data hold verified standing, while data consumers are relegated to observers.
A domestic IR smallsat constellation generates a sovereign orbital-mechanics and space-situational-awareness industrial base applicable directly to missile warning and cislunar domain awareness — dual-use justification reinforces the investment case.

Reference architecture

Payload: Wide-field thermal-infrared imager, 6–10 µm band, 2° × 2° instantaneous field of view, 128 Mpx HgCdTe focal plane array; secondary visible-band imager (500–900 nm) for astrometric confirmation and light-curve characterisation; combined limiting magnitude V~22 in 60-second integration
Bus class: ESPA-class microsat, 150–200 kg, 600W end-of-life solar power, 3-axis stabilised to <3 arcsec pointing, 512 GB solid-state recorder; heritage from SSTL-150 or Airbus Arrow bus
Orbit: Heliocentric orbit at 0.7–0.8 AU (Venus-trailing or leading); alternatively, high-inclination LEO at 700 km for a lower-cost demonstrator accepting reduced inner-solar-system coverage; 6-satellite constellation for full sky cadence of <7 days per field
Ground segment: Primary deep-space ground station (X-band, 15m dish) for heliocentric variant; sovereign facility required given data volumes of ~80 GB/pass; ESA ESTRACK or DSN used as backup under bilateral agreement; separate S-band TT&C at second domestic site
Software & data
Latency
Cost band
Lead time

References

NASA Planetary Defense Coordination Office — Near-Earth Object Surveys — NASA's PDCO coordinates US-government-funded NEO surveys and maintains the authoritative risk table. The office explicitly calls for international partnership to achieve the congressional mandate of cataloguing 90% of NEOs larger than 140m.
ESA Space Safety — Planetary Defence — ESA's Planetary Defence Office operates the Near-Earth Object Coordination Centre (NEOCC) and contributes independent astrometry. ESA stresses that geographic diversity of telescopes reduces systemic gaps in sky coverage.
United Nations Office for Outer Space Affairs — International Asteroid Warning Network — IAWN is a voluntary network of observatories that share NEO observations; UNOOSA facilitates but does not mandate contributions, meaning survey coverage is directly proportional to national investment.
B612 Foundation — Sentinel Space Telescope Programme — B612's Sentinel concept demonstrated that an infrared telescope in a Venus-like orbit can survey the inner solar system far more efficiently than ground-based optical surveys, detecting NEOs in daylight-blind regions invisible from Earth.
IAU Centre for Near Earth Objects — MPC Data Services — The IAU's Minor Planet Center is the single authoritative archive for NEO astrometric reports; nations that submit observations gain attribution in the global catalogue and formal co-discovery credit.