The Amundsen-Ganswindt basin: An overlooked lunar peak-ring basin with multiple exploration opportunities
Bibliographic record
Abstract
The ~355 km diameter Amundsen-Ganswindt impact basin (81°S, 120°E) has been stratigraphically constrained as the oldest large basin in the South Pole-Aitken basin terrane. It partly overlaps the Artemis Exploration Zone, across which it deposited significant volumes of impact ejecta deposits. The basin is highly degraded and partially superposed by the similar-sized Schrödinger peak-ring impact basin, leading previous workers to question whether it contains any remnants of an original peak-ring. We have conducted a detailed geologic study of the Amundsen-Ganswindt basin and evaluated the scientific potential of this ancient structure in the context of global lunar exploration objectives that underpin future crewed and robotic exploration missions to the lunar south polar region. We have mapped the basin at a scale of 1:1,000,000 and identified high-value exploration targets, including remnants of an original peak ring and opportunities to sample this uplifted material. Given its age, both Amundsen-Ganswindt's peak ring and ejecta deposits will contain a high proportion of material from the South Pole-Aitken basin. In addition, material from the Schrödinger peak-ring impact basin — the second youngest basin on the Moon — are also available for sampling. Morphological evidence suggests that the Amundsen-Ganswindt basin influenced the final morphology of Schrödinger's rim and peak ring. The Amundsen-Ganswindt basin is also host to large, accessible permanently shadowed regions with orbital detections of water ice. Thus, we propose that the overlooked Amundsen-Ganswindt basin is an exceptional exploration target for future robotic and human exploration missions.
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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 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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".