Space Traffic Management: Who Controls Traffic in Orbit?

There is no air traffic control for space. No central authority directs satellites to change lanes, yield, or hold position. And yet, over 10,000 active satellites share orbits with an estimated 36,000 tracked debris objects larger than 10 cm and millions of smaller fragments. Close approaches between objects in orbit happen hundreds of times per day. The question of who manages traffic in space, and whether the current system is adequate for an era of mega-constellations, is one of the most urgent policy challenges in the space industry.

The Current System

Today's space traffic management system is a patchwork of military capabilities, commercial services, and bilateral agreements, not a unified global system:

The 18th Space Defense Squadron (18 SDS)

The primary source of space situational awareness (SSA) data is the U.S. Space Force's 18th Space Defense Squadron at Vandenberg Space Force Base, California. The 18 SDS operates the Space Surveillance Network (SSN), a global network of ground-based radars and optical telescopes that tracks objects in Earth orbit.

Key capabilities:

• Catalog maintenance: Maintains a catalog of ~47,000 objects (as of early 2026), including active satellites, defunct satellites, rocket bodies, and debris
• Conjunction assessment: Screens the catalog for predicted close approaches and issues Conjunction Data Messages (CDMs) to satellite operators when collision risk exceeds defined thresholds
• Launch conjunction assessment: Screens proposed launch trajectories against the catalog to ensure safe passage through the orbital environment
• Breakup analysis: Detects and characterizes fragmentation events (explosions, collisions, or deliberate destruction)

The 18 SDS provides basic conjunction warnings to all operators worldwide at no cost through Space-Track.org. This is a remarkable service: a U.S. military unit providing safety-of-flight information to every satellite operator on Earth, including commercial competitors and geopolitical adversaries.

The Department of Commerce (Proposed Transfer)

In 2018, Space Policy Directive-3 (SPD-3) directed the transfer of civil space traffic management responsibilities from the Department of Defense to the Department of Commerce. The Office of Space Commerce (OSC) within NOAA was designated to build a civil Traffic Coordination System for Space (TraCSS). As of 2026:

• TraCSS is in development and has reached initial operational capability for basic conjunction screening
• The system incorporates data from commercial SSA providers (LeoLabs, ExoAnalytic, Numerica) in addition to DoD data
• Full operational capability, with open architecture and operator-to-operator coordination tools, is expected by 2027-2028
• Funding has been a persistent challenge; Congress has appropriated less than requested in multiple fiscal years

Commercial SSA Providers

A growing commercial SSA industry provides tracking data, conjunction assessment, and analytics to satellite operators:

• LeoLabs: Operates phased-array radars optimized for LEO tracking; provides conjunction screening, maneuver detection, and fragmentation analysis
• ExoAnalytic Solutions: Operates a global network of optical telescopes for GEO and MEO tracking
• Numerica: Provides astrodynamics software and operates optical telescopes for SSA
• AGI (Ansys): Develops STK and ComSpOC, widely used for space operations planning and SSA
• Privateer Space: Develops an open-data SSA platform with enhanced orbit determination
• Slingshot Aerospace: Provides SSA analytics and space domain awareness tools

How Collision Avoidance Works Today

The current collision avoidance process follows a general workflow:

1. Tracking: The SSN and commercial sensors continuously track objects and update their orbital elements
2. Screening: Automated systems screen the catalog against every active satellite, computing miss distance and collision probability for all conjunctions within a defined look-ahead period (typically 7 days)
3. Alert: When collision probability exceeds a threshold (typically 1 in 10,000 for a CDM alert, though operators set their own action thresholds), the 18 SDS issues a CDM to the affected operators
4. Assessment: Satellite operators (their flight dynamics teams or automated systems) evaluate the CDM, refine the conjunction assessment using their own precise ephemeris data, and determine whether a maneuver is warranted
5. Maneuver decision: If the risk exceeds the operator's action threshold (commonly 1 in 10,000 to 1 in 100,000), the operator plans and executes an avoidance maneuver
6. Coordination: Operators notify the 18 SDS of planned maneuvers so the updated orbit can be incorporated into the catalog and future conjunction assessments

Scale of the Problem

The numbers illustrate why the current system is under strain:

• The 18 SDS processes approximately 50,000+ conjunction warnings per day
• SpaceX's Starlink alone performs thousands of collision avoidance maneuvers per year using its autonomous collision avoidance system
• The Iridium-Cosmos collision of 2009, which created 2,000+ debris fragments, demonstrated what happens when conjunction assessment fails or is ignored
• As mega-constellations grow, the number of conjunctions scales quadratically with the number of objects

Gaps in the Current System

Several fundamental gaps exist in today's space traffic management:

No Binding Rules of the Road

Unlike aviation and maritime law, there are no internationally binding rules for right-of-way in orbit. When two satellites approach each other, there is no agreed-upon protocol for which one maneuvers. In practice, the more maneuverable satellite typically moves, but this is convention, not law. The 2019 near-miss between ESA's Aeolus satellite and a Starlink satellite highlighted this gap when neither operator initially planned to maneuver.

No Global Authority

No international body has the authority or capability to manage orbital traffic globally. The International Telecommunication Union (ITU) coordinates radio frequencies and orbital slot filings for GEO, but its role does not extend to traffic management. COPUOS develops non-binding guidelines but lacks enforcement authority.

Tracking Limitations

• Objects smaller than ~10 cm in LEO and ~1 meter in GEO are largely untracked
• Tracking accuracy varies; positional uncertainty can be hundreds of meters, making collision probability assessments imprecise
• Maneuvers by other operators are not always communicated, leading to "lost" satellites that must be relocated in the catalog

No Standard Data Sharing

Operators use different ephemeris formats, accuracy standards, and coordination protocols. While CCSDS standards exist, adoption is inconsistent. Sharing precise ephemeris data requires trust, and some operators are reluctant to share data that reveals their satellite's capabilities.

The Future of Space Traffic Management

Several developments are shaping the future of STM:

Automated Collision Avoidance

SpaceX's Starlink already uses autonomous collision avoidance, where satellites automatically maneuver based on conjunction data without human intervention. As constellations grow to tens of thousands of satellites, automated systems are the only scalable approach. The challenge is ensuring interoperability between different operators' autonomous systems.

International Coordination Efforts

• The UN COPUOS Long-Term Sustainability Guidelines (2019) provide non-binding best practices for STM
• The Space Safety Coalition has published best practices for conjunction assessment and collision avoidance
• The Artemis Accords include provisions for notification and coordination of space activities
• The European Space Agency is developing its own SSA capabilities through the Space Safety Programme

Regulatory Proposals

Multiple proposals are under consideration to formalize STM:

• U.S. Space Traffic Management framework: Building on SPD-3, legislation has been introduced in Congress to establish formal traffic management authority, rules of the road, and enforcement mechanisms
• FCC enhanced requirements: The FCC continues to expand its orbital debris rules, with the 5-year deorbit rule as the latest example
• International treaty discussions: While no new STM treaty is imminent, multilateral discussions are ongoing at COPUOS and in bilateral fora

Technology Solutions

Advanced technology is essential for future STM:

• Space-based SSA: Satellites dedicated to tracking other satellites (e.g., ExoAnalytic's upcoming space-based sensors) will improve tracking accuracy and coverage
• AI/ML for conjunction prediction: Machine learning models can improve collision probability estimates by learning from historical data and reducing false alarms
• Digital twin of the orbital environment: Real-time models of the entire orbital environment, updated continuously, could enable predictive traffic management
• Standardized communication protocols: Work is underway on standardized, automated operator-to-operator coordination protocols

Space traffic management is in a transitional period. The current system, built around U.S. military capabilities and voluntary cooperation, has worked remarkably well given the constraints. But as the orbital population grows from 10,000 to potentially 100,000+ active satellites over the next decade, a more formal, international, and automated system is essential. The question is whether the regulatory and diplomatic infrastructure can keep pace with the technology.

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