The Mars 2020 Three Forks Sample Depot
Bibliographic record
Abstract
The Perseverance rover continues to make progress on the task of collecting and documenting a set of Martian samples for future return to Earth by the Mars Sample Return program [1]. Near the end of 2022 the rover had acquired, sealed, and stored onboard a total of 15 rock cores, 2 regolith samples, 1 ambient atmosphere sample, and 3 witness tubes [2]. Of these 21 sealed tubes, 10 have been selected for inclusion in a first depot located in the Three Forks region on the floor of Jezero crater near an outflow basin [3]. In December of 2022 the rover began the construction of this depot. The Three Forks region was chosen for the depot location because it is an area with flat terrain, no large rocks, and enough area for the Perseverance rover and potential future robotic vehicles to maneuver around the depot without disturbing the sample tubes [4]. The individual sample core tips are imaged by the Mastcam-Z [5] and Cachecam [6] cameras prior to tube sealing and subsequent storage. These images document the texture and color of the samples and form an important component of the overall sample documentation data set [7]. After the sample tubes are dropped in the depot at pre-designated zones, images of the tubes are acquired with the Front Hazcam, Navcam cameras, and optionally the WATSON camera [8]. These images serve two purposes: a) to provide confirmation of the tube state to the operations team during sample depot construction and b) formally record the location of the tubes within the Three Forks region for the potential retrieval of the tubes by later missions. At the time of this writing, construction of the Three Forks sample depot by the rover operations team was underway, with depot completion expected by February 2023. References: [1] Farley, K.A., Space Sci Rev 216, 142 (2020). [2] Herd, C.D.K, et al., LPSC 2023. [3] September 2022 - MSR/M2020 Sample Depot Science Community Workshop. [4] N. Williams, Golombek, LPSC 2023. [5] Bell, J.F. III, Maki, J.N., et al. Space Sci Rev 217, 24 (2021). [6] Maki, J.N.. et al. Space Sci Rev 216, 137 (2020). [7] Maki et al., LPSC 2022. [8] Bhartia, R., et al., Space Sci Rev 217, 58 (2021).
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 | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.002 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.002 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.112 | 0.055 |
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".