What COSPAR Planetary Protection Policy 2021 - Mission Category Bioburden Requirements requires
COSPAR Planetary Protection Policy (2021 revision) classifies all solar system missions into five protection categories based on contamination risk. Categories I-II (flyby, orbiters of low-risk bodies) require documentation only. Category III-IV (Mars orbiters and landers respectively) impose bioburden limits of ≤300,000 spores/m² (surface) and ≤500,000 total spores per spacecraft before sterilisation, with Viking Bioassay as the reference method. Category V (Earth-return) missions require collection container verified probability of containing no viable organisms ≤10⁻⁶. Missions to Europa, Enceladus, and Mars Special Regions are subject to enhanced Category IV (restricted) requirements including dry-heat microbial reduction to ≤300 spores per spacecraft.
Pillar: Space & Satellite Law · Authority: COSPAR (Committee on Space Research) - Bureau of the International Science Council · Version: 2.0.1 · Last updated:
Primary source: https://sma.nasa.gov/sma-disciplines/planetary-protection/
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Primary Citations — 8 traced to source
- Category I-V definitions, bioburden limits, sterilisation requirements per COSPAR 2020 edition — COSPAR Planetary Protection Policy - NASA Planetary Protection Categories Implementation (2021)
- Article IX: Avoidance of harmful contamination of outer space and Earth — Treaty on Principles Governing the Activities of States in the Exploration and Use of Outer Space 1967 - Article IX
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