Who provides space debris tracking data for satellite collision avoidance?

Space debris tracking data for satellite collision avoidance is provided by a mix of government space surveillance networks, international programs, and commercial space situational awareness (SSA) companies. These organizations detect and track objects, maintain orbital catalogs, and provide conjunction warnings (predicted close approaches) to satellite operators.NASA+1

Major providers

• United States Space Force — Through the Space Surveillance Network (SSN) and units such as the 18th Space Defense Squadron, it maintains a large catalog of tracked space objects and provides conjunction assessment products, including Conjunction Data Messages (CDMs), to support collision avoidance. Public access to many catalog products is provided through space-track.org.NASA+1
• European Union Space Surveillance and Tracking — The EU SST program combines data from European sensors and provides collision avoidance alerts, re-entry analysis, and fragmentation analysis services for spacecraft operators.EU Agency for the Space Programme+1
• European Space Agency — ESA develops and operates space safety capabilities, including debris tracking research and SSA services that help identify collision risks.European Space Agency
• National Aeronautics and Space Administration — NASA operates conjunction assessment capabilities for its missions and conducts orbital debris research and modeling.Federal Aviation Administration+1

Commercial SSA providers

Commercial companies increasingly supplement government catalogs with additional sensors, tracking coverage, and analytics. Examples include:

• LeoLabs — Uses global phased-array radar networks focused largely on low Earth orbit (LEO) tracking and provides commercial tracking and collision-risk services.NASA
• Slingshot Aerospace — Operates optical tracking networks and provides space traffic coordination and SSA services.NASA
• ExoAnalytic Solutions — Operates telescope networks and maintains proprietary catalogs for tracking objects in orbit.NASA
• Aldoria — Provides space surveillance and collision avoidance services using its tracking capabilities.Aldoria — Space Technology

Typical data products used for collision avoidance

Satellite operators commonly receive:

• Orbital elements — estimates of where an object is and how it moves.
• Conjunction Data Messages (CDMs) — alerts describing a predicted close approach between two objects.
• Probability-of-collision estimates — calculated risk metrics used to decide whether a maneuver may be needed.
• Tracking observations — radar, optical, or other sensor measurements used to refine an orbit.Space-Track+1

In practice, many operators combine multiple sources: government catalogs for broad coverage, commercial SSA providers for additional observations or specialized analytics, and their own tracking data for mission-specific decisions.Space Commerce+1

Several organizations provide space-object tracking data used for satellite collision avoidance, ranging from government catalogs to commercial SSA providers:

• U.S. Space Force / 18th Space Defense Squadron (18 SDS) — The primary U.S. government source. Its Space Surveillance Network (SSN) tracks and catalogs artificial objects and maintains the high-accuracy space catalog. Conjunction screening data are distributed as Conjunction Data Messages (CDMs).NASA+1
• NASA CARA (Conjunction Assessment Risk Analysis) — NASA's operational interface for collision avoidance. CARA receives spacecraft ephemerides from NASA missions and has them screened against the Space Force catalog, then performs risk analysis and supports maneuver decisions.NASA
• ESA / European Space Agency — ESA operates its own Space Debris Office and provides conjunction predictions and collision-risk services. ESA combines U.S.-provided conjunction data with its own orbit information.European Space Agency
• EUSST (EU Space Surveillance and Tracking) — European national capabilities contribute tracking and collision-avoidance services; for example, France's CNES operates the CAESAR conjunction-analysis service within the EUSST framework.NASA
• Commercial providers — Companies such as LeoLabs, ExoAnalytic, and Slingshot Aerospace operate independent radar or optical sensor networks and sell tracking/space-situational-awareness data and services. NASA notes that commercial measurements can supplement government SSN observations.NASA+1

The important distinction

For actual collision avoidance, a simple public orbital catalog isn't necessarily sufficient. For example, U.S. Space Force TLEs are useful for general orbit information, but NASA specifically notes that TLEs aren't accurate enough for conjunction assessment because they lack the covariance information needed to calculate collision probability.NASA

So, in simplified form:

Sensors → Space-object tracking/catalog → Conjunction screening → Collision-risk assessment → Maneuver decision

In the U.S., the Space Surveillance Network / 18 SDS is central to the tracking and cataloging stage, while organizations such as NASA CARA turn that information into operational collision-avoidance analysis.NASA+1

If you're asking because you're evaluating data providers for a commercial satellite, I can also compare the main providers (Space-Track/USSF, LeoLabs, Slingshot, ExoAnalytic, ESA/EUSST, etc.) by coverage, accuracy, API access, latency, and cost.

Several organizations provide space-object tracking data that satellite operators use for conjunction assessment and collision avoidance. The ecosystem is roughly divided into government/public sources and commercial providers:

Major providers

• U.S. Space Force / 18th Space Defense Squadron (18 SDS) — The primary U.S. government source. The U.S. Space Surveillance Network tracks and catalogs thousands of objects and provides orbital data that underpin conjunction warnings and Conjunction Data Messages (CDMs). ESA describes the U.S. network as a main source of space-debris information.European Space Agency+1
• ESA / EU Space Surveillance and Tracking (EUSST) — ESA and European national systems combine radar, optical, and other observations to maintain catalogs and generate conjunction predictions. ESA also provides operational collision-avoidance services to missions.European Space Agency+1
• LeoLabs — A major commercial provider focused particularly on LEO. Its distributed phased-array radar network provides orbital data, state vectors, and real-time conjunction alerts/CDMs for satellite operators.LeoLabs+1
• Slingshot Aerospace — Operates a global optical sensor network and provides orbital observations, state vectors, ephemerides, and data intended for automated collision-avoidance analysis.Slingshot Aerospace
• ExoAnalytic Solutions — Operates a large global optical telescope network, with particularly strong coverage of GEO, MEO and HEO. It provides tracking observations, orbital data and conjunction-related services.Anduril
• ESA DISCOS — More of a catalog/database than a primary real-time sensor network. DISCOS contains object identity, physical characteristics and orbital-history information and is used in ESA's collision-avoidance processes.DISCOSweb+1

If you're building a collision-avoidance system

A typical architecture doesn't rely on just one provider. An operator might combine:

USSF/Space-Track data → commercial tracking (LeoLabs/Slingshot/ExoAnalytic) → own spacecraft ephemeris → conjunction screening → probability-of-collision calculation → maneuver decision.

The commercial providers are particularly useful when you need higher-frequency observations, independent tracking, lower-latency updates, or coverage of objects that are difficult to maintain accurately in a public catalog. NASA specifically identifies ExoAnalytic, Slingshot Aerospace, and LeoLabs as commercial tracking providers.NASA

If you tell me whether you're interested in LEO, MEO, GEO, or all orbits, I can also give you a comparison of these providers' data products, APIs, accuracy, latency, coverage, and approximate pricing/access model.

Space debris tracking and collision avoidance data are provided by a combination of foundational military networks, international civilian space agencies, and a growing sector of commercial Space Situational Awareness (SSA) providers.orbitalradar.com+1

1. Primary Government and Military Networks

• 18th Space Defense Squadron (18 SDS): Operated by the U.S. Space Force, the 18 SDS utilizes the global Space Surveillance Network (SSN)—featuring high-powered ground radars and optical sensors like the Space Fence—to track objects in Earth orbit. They issue foundational Conjunction Data Messages (CDMs) and share public tracking data via Space-Track.org.esa.int+3
• EU Space Surveillance and Tracking (EU SST): A consortium of European national agencies (including contributions from France, Germany, Spain, and Italy) that pool radar and optical sensors to monitor orbital debris and provide European satellite operators with conjunction warnings.orbitalradar.com+1
• Office of Space Commerce (DOC): Part of the U.S. Department of Commerce, it is developing civil space traffic management capabilities (such as the TraCSS project) to transition baseline safety-of-flight coordination away purely from military channels.

2. Specialized Commercial Providers

• LeoLabs: Operates a global network of phased-array radars explicitly targeted at low Earth orbit (LEO). LeoLabs provides high-cadence tracking, precise orbit determination, and automated collision avoidance services for commercial constellations and government satellites.orbitalradar.com+2
• ExoAnalytic Solutions: Operates a worldwide commercial network of optical telescopes providing real-time optical tracking, characterization, and conjunction assessment, particularly effective for deep space and geostationary (GEO) orbits.orbitalradar.com+1
• Kayhan Space: Offers automated space traffic coordination and collision avoidance operational platforms that ingest multi-source SSA data to streamline maneuver decisions for satellite operators.
• Emerging commercial players providing independent LEO/MEO tracking layers, optical custody, and conjunction alerts to close regional coverage gaps.

3. International Space Agency Offices

• European Space Agency (ESA) Space Debri Office: Based at ESOC in Germany, it maintains the DISCOS database, runs sophisticated environment models (like MASTER and DRAMA), and coordinates dedicated debris avoidance maneuvers for ESA's own spacecraft fleet.orbitalradar.com+2

If you are managing an active satellite or constellation, let me know your orbital regime (LEO, MEO, or GEO) and whether you are looking for raw tracking data feeds or an automated collision-avoidance software platform.

The main providers of space-debris tracking and collision-avoidance data are a mix of government, international, and commercial organizations:

• U.S. Space Force / 18th Space Defense Squadron (18 SDS) — the principal global source for the U.S. space catalog. It operates Space-Track.org, using the U.S. Space Surveillance Network (SSN) to maintain orbital data on satellites and debris. It also produces Conjunction Data Messages (CDMs) used to warn operators of close approaches.NASA+1
• European Space Agency (ESA) — its Space Debris Office operates its own Space Surveillance and Tracking (SST) capabilities and provides conjunction prediction, collision-risk assessment, and maneuver recommendations to ESA and third-party missions. ESA combines its own orbital information with U.S. tracking data and other sources.European Space Agency+1
• National space-surveillance networks — countries including France, Germany, Italy, the UK, Japan, and others operate radars and telescopes that contribute observations to space-situational-awareness efforts. ESA notes that national and commercial systems supplement the U.S. SSN.European Space Agency
• Commercial tracking providers — companies such as LeoLabs, ExoAnalytic Solutions, and others operate independent radar/optical networks and offer higher-frequency or specialized tracking and conjunction services to satellite operators.
• NASA — NASA's Conjunction Assessment Risk Analysis (CARA) team uses tracking/ephemeris data to assess collision risks for NASA spacecraft. NASA relies substantially on the U.S. Space Force's catalog and conjunction data, while incorporating additional tracking when needed.NASA

In practice

For a commercial satellite operator, the workflow often looks like:

Tracking sensors → orbital catalog → conjunction screening → collision probability → operator → possible avoidance maneuver

The U.S. Space Force/Space-Track ecosystem is the foundational public source, while ESA and commercial providers can provide additional analysis and/or independent tracking. ESA specifically describes its collision-avoidance system as being designed to ingest warnings from multiple surveillance-data providers.ESA Proceedings Database

If you're asking because you're evaluating which providers you can actually obtain API/data access from for an operational satellite, I can give you a comparison of Space-Track vs. LeoLabs vs. ExoAnalytic vs. ESA, including data formats, latency, API access, coverage, and approximate cost.

Space debris tracking and collision avoidance data are provided by a combination of military networks, government civil agencies, international consortia, and commercial radar/optical operators.orbitalradar.com+1

1. Military & Defense Networks (Primary Global Source)

• 18th Space Defense Squadron (18 SDS): Operated by the U.S. Space Force, the 18 SDS (formerly JSpOC) is the foundational source of global space tracking data. It monitors thousands of objects using the U.S. Space Surveillance Network (SSN) —a global web of military radar and optical sensors—and issues conjunction (collision) warnings to satellite operators worldwide for free via Space-Track.org.orbitalradar.com+1

2. Commercial Tracking Providers

Due to the congestion of Low Earth Orbit (LEO) and the limits of military radar, commercial companies have emerged to provide high-frequency, high-precision tracking and independent collision avoidance services:

• LeoLabs: Operates a proprietary global network of commercial phased-array radars dedicated to tracking objects in LEO, offering rapid conjunction assessments and collision avoidance services.orbitalradar.com+1
• ExoAnalytic Solutions: Utilizes a vast, worldwide commercial network of optical telescopes, specializing heavily in deep space and Geostationary Earth Orbit (GEO) tracking.orbitalradar.com+1
• Private SSA firms: Companies like SpaceDyS provide specialized high-precision orbit determination, collision risk assessments, and re-entry predictions.spacedys.com+1

3. Civil Government & International Agencies

• Office of Space Commerce (TraCSS): Part of NOAA in the U.S., the Traffic Coordination System for Space (TraCSS) is transitioning into the primary civil agency providing safety data, traffic coordination, and basic SSA services to commercial operators.space.commerce.gov+1
• EU Space Surveillance and Tracking (EU SST): A European consortium pooling national radar and optical assets (contributed by nations like France, Germany, Spain, and Italy) to provide autonomous space surveillance services to European operators.orbitalradar.com+1
• ESA Space Debris Office: Based at ESOC in Germany, the European Space Agency tracks debris, maintains environmental models (like MASTER), and coordinates collision avoidance maneuvers for European fleet missions.orbitalradar.com+1

If you are looking for data for a specific project, would you like details on how to register for free government data via Space-Track / TraCSS or information on commercial API integration?