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How SSA data moves from tracking to a decision
- Estimate the objects’ orbits. Space-surveillance observations support orbit estimates for catalogued objects. Operators can also supply predicted ephemerides for their active spacecraft: future positions and velocities, together with covariance information describing uncertainty. Planned maneuvers matter because they can change a spacecraft’s predicted path. NASA’s conjunction-prediction explanation and its CARA resources describe these inputs.
- Screen predicted paths for close approaches. NASA says the U.S. Space Force 18th Space Defense Squadron conducts screenings three times daily for NASA’s on-orbit conjunction assessment. A screening volume is projected along the protected spacecraft’s predicted path; catalogued objects that enter it are flagged for attention. A penetration means a potential conjunction has been identified, not that impact is certain. NASA’s overview explains the screening process.
- Send a conjunction message. For the U.S. Space Force screening service described by NASA, a screening-volume penetration generates a Conjunction Data Message (CDM). The message includes summary parameters for the encounter, each object’s estimated state and covariance at closest approach, and information about the orbit determination behind those estimates. NASA’s technical explanation describes the message’s role.
- Assess the collision risk. A CDM is a proximity alert, not a completed risk assessment. NASA explicitly cautions that “CDMs are not collision warnings.” Risk analysis considers predicted miss distance, uncertainty in the event, and the combined hard-body radius—the effective collision size—of the two objects. NASA’s explanation of conjunction prediction and CARA’s FAQ describe those factors.
- Coordinate and act if warranted. Analysts and spacecraft operators review the event, exchange relevant orbit and maneuver information, and weigh possible responses. If the risk justifies action, the operator can plan a maneuver and check its predicted result against other objects’ paths. ESA says its Space Debris Office supports mission teams with risk estimates and avoidance-maneuver planning. Space-Track says avoidance is the owner/operator’s responsibility, with the 18th Space Defense Squadron supporting the process through screening and CDMs. A 2021 NASA–SpaceX agreement also describes inter-operator data sharing and coordination.
Why an alert is not the same as a collision warning
A predicted close approach is based on estimates, and those estimates have uncertainty. Two spacecraft may appear close in a forecast, but the separation alone does not establish how likely impact is. Analysts need to consider the miss distance alongside the uncertainty in the predicted positions and the objects’ effective sizes. A screening alert identifies an event to assess; the risk assessment helps determine whether action is appropriate.
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Forecasts are refreshed because orbit estimates and planned paths can change. ESA says its operational predictions are updated several times daily and typically extend seven days ahead. NASA describes its current practice as looking roughly a week ahead. These are descriptions of those services, not a universal update schedule or forecast horizon for every operator.
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Who receives the data and who decides to maneuver?
SSA data access and support are not identical for every operator. Space-Track says its main purpose is distributing SSA data to approved users and that access requires account credentials. It also describes emergency conjunction-assessment support and CDMs. NASA’s CARA FAQ says the program performs risk analysis and supports maneuver planning for the operators it serves. These services support decisions; responsibility for avoidance remains with the spacecraft owner or operator.
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Coordination matters because a maneuver changes a spacecraft’s predicted path and may affect another operator’s plans. Sharing planned ephemerides and maneuver information helps operators assess the same event using more current assumptions and reduces the chance that independently planned actions conflict.
Why the workload is growing
More objects in orbit mean more predicted encounters to screen and assess. ESA’s 2025 Space Environment Report estimates more than 1.2 million debris objects larger than 1 cm, based on data collected through the end of 2024. That is an estimate of the debris population, not a count of objects all tracked in the public catalogue. ESA says increasing traffic and debris are driving more events that trigger avoidance procedures. ESA’s 2025 report overview provides the estimate and context.
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What to compare when evaluating SSA data or services
NASA and ESA describe different parts of the operational chain; their material is not a head-to-head assessment of commercial vendors. For an operator comparing data or services, the useful questions are:
Quick Recap
- Data provenance and coverage: What observations and objects are represented, and how are active spacecraft ephemerides incorporated?
- Orbit quality: Are state estimates and covariances available, and how current and useful are they for assessing an encounter?
- Update cadence and horizon: How often are predictions refreshed, and how far ahead do they extend?
- Service scope: Does the service only flag proximity, or does it also provide collision-risk analysis?
- Operator inputs: Can the operator submit planned ephemerides and maneuver information so the forecast reflects intended actions?
- Decision support: Does the service help screen maneuvers and coordinate with other operators, or does that work remain with the operator?
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