Possible Disintegration of Main-belt Asteroid 2008 BJ<sub>22</sub>
Bibliographic record
Abstract
Abstract Active asteroids are a mysterious population of objects on asteroid-like orbits that display comet-like activity produced by a diverse variety of mechanisms, providing glimpses of the ongoing evolution of the asteroid belt and near-Earth objects. We report the identification of a new active asteroid 2008 BJ 22 , from images obtained by the Subaru Telescope in 2008. The object was not detected in earlier Canada–France–Hawaii Telescope images obtained in 2005 down to a 3 σ limiting magnitude of m r ∼ 24, corresponding to a V -band absolute magnitude of H V > 18.4, more than 3 mag fainter than the absolute magnitude computed from 2008 data. Analysis of later images obtained by the Dark Energy Camera on the 4.0 m Victor M. Blanco Telescope in 2013 set the object’s current V -band absolute magnitude at H V > 19.3. These results suggest that 2008 BJ 22 was discovered in an active state in 2008 January.
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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 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.001 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 0.001 |
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".