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Conjunction Assessment

Collision avoidance orbital safety includes analyzing future predicted positions of NASA protected assets (called the “primary” object), and all of the other known objects in space (called the “secondary” object). On orbit conjunction assessment is driven by screenings conducted three times a day by the US Space Force 18th Space Defense Squadron. In each of these screenings, volumetric regions around the primary object are analyzed to determine whether any of the other catalogued objects penetrate this volume, which are then assessed as conjunction threats.

Conjunction Risk Assessment

NASA Spacecraft Conjunction Assessment

CA Handbook


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Conjunction Assessment

CARA service for conjunction assessment screenings and risk analysis.



The Flight Operations Directorate (FOD) at NASA’s Johnson Space Center touches every program and part of sending humans to space.

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Learn about those of the NASA corps who make “space sailing” their career profession.

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Frequently Asked Questions

Answers to common Conjunction Assessment questions.

Conjunction Assessment Risk Analysis

Orbital Debris

CARA Sections

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Step 1: Conjunction Event Prediction

Learn about the history of Glenn Research Center.

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Step 2: Close Approach Risk Assessment

The results from a Conjunction Assessment (CA) screening

Stage 3 MTS Example

Step 3: Close Approach Risk Mitigation

For close approaches that manifest a high level of collision risk

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