Bioburden Reductions on the Europa Clipper Spacecraft During its MEGA-trajectory Cruise to Jupiter
Bibliographic record
Abstract
Abstract The Cruise-Phase Microbial Survival (CPMS) model was used to estimate the bioburden reduction on the Europa Clipper (EC) spacecraft during its transit to Jupiter based on the final flown Mars–Earth gravity assist (MEGA) trajectory, a trajectory not considered in previous work. The CPMS model evaluates the bioburden reduction due to UV radiation, temperature, and vacuum. Under the MEGA trajectory, bioburdens on external and shallow interior surfaces accumulate the highest reductions due to the synergistic effects of temperature and vacuum, contributing to hundreds of thousands of Sterility Assurance Levels (SALs). Deep internal surfaces do not reach one SAL unless heated to at least 233 K. The revised CPMS model estimates that there will be no viable bioburden remaining on or near the exterior surfaces of the EC spacecraft upon its arrival at Jupiter following the completion of the MEGA trajectory.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.001 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".