Bibliographic record
Abstract
We measure the activity and orbital characteristics of the η-Aquariid meteor shower appropriate to meteoroids of 200 μm size (mass ≈ 5–10 μg) based on ∼4 × 104 stream orbits measured by the Canadian Meteor Orbit Radar during the years 2002–2014. Significant activity from the stream is found to last from April 25–May 21 (λ⊙ = 35°–60°) with the shower detectable approximately one week on either side of these dates just above the median background. The radiant at peak activity (λ⊙ = 45|$_{.}^{\circ}$|5) is located at αg = 337|$_{.}^{\circ}$|8, δg = −0|$_{.}^{\circ}$|6 and shows a consistent drift of Δαg = +0|$_{.}^{\circ}$|69, Δδg = +0|$_{.}^{\circ}$|60. The velocity of the stream throughout its active period remains within ≈1 km s−1 of Vg = 64.3 km s−1 found at the peak; however, there are indications this is an underestimate due to undercorrection for stream meteoroids having larger than average deceleration. The activity profile shows no mass dependence between μg to mg sizes, but a clear asymmetry with the slope of the ascending branch having B+ = 0.135 ± 0.003 and the descending branch B− = 0.078 ± 0.003. The average yearly equivalent radar-measured peak Zenithal Hourly Rate (ZHR) is 50–80 from 2002–2014, with outbursts in 2004 and 2013 exceeding ZHRs of 100. The mass index shows a minimum at the time of the flux maximum with 1.8 ≤ s ≤ 1.9.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 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".