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Record W4411609280 · doi:10.4006/0836-1398-38.2.95

Orbital evolution of the Neptunian moons Hippocamp and Proteus

2025· article· en· W4411609280 on OpenAlexvenueno aff
Leslie A. King

Bibliographic record

VenuePhysics Essays · 2025
Typearticle
Languageen
FieldPhysics and Astronomy
TopicAstro and Planetary Science
Canadian institutionsnot available
Fundersnot available
KeywordsPhysicsTrans-Neptunian objectAstrobiologyProteusBiologySolar System

Abstract

fetched live from OpenAlex

The origin and fate of most of the satellites that now orbit Neptune are reasonably well understood, but the orbital evolution of Hippocamp and Proteus is less clear. Proteus is the second largest moon of Neptune, whereas Hippocamp is much smaller. There is increasing evidence that cosmological expansion, as described by the Hubble‐Lemaître parameter, occurs in the Solar System. For Hippocamp and Proteus, orbital analysis based on local cosmological expansion shows that neither can be original moons of Neptune since both have only been outside the synchronous (stationary) orbit of Neptune for about 3.3 × 10 9 years (3.3 Gyr). It has previously been suggested that they represent the residues from the break-up of an earlier moon. Furthermore, the orbits of Hippocamp and Proteus coincided at that time. This supports earlier ideas that these two moons arose from the fragmentation of an original body. It may be noted that this epoch, i.e., 3.3 Gyr ago, is consistent with timings in those theories of the “Late Heavy Bombardment,” whereby planets and their satellites experienced major asteroid impacts long after the formation of the Solar System. These results are in conflict with the widely held view that cosmological expansion does not operate at the local level.

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 distilled prediction

Teacher imitation

Not calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.

metaresearch head score (Codex)0.000
metaresearch head score (Gemma)0.000
Version: codex-gemma-dda1882f352aValidation status: machine_predicted_unvalidated
Candidate categoriesnone
Consensus categoriesnone
DomainCandidate signal: none · Consensus signal: none
Study designCandidate signal: Theoretical or conceptual · Consensus signal: Theoretical or conceptual
GenreCandidate signal: Empirical · Consensus signal: Empirical
Teacher disagreement score0.258
Threshold uncertainty score0.206

Codex and Gemma teacher scores by category

CategoryCodexGemma
Metaresearch0.0000.000
Meta-epidemiology (narrow)0.0000.000
Meta-epidemiology (broad)0.0000.000
Bibliometrics0.0000.000
Science and technology studies0.0000.000
Scholarly communication0.0000.000
Open science0.0000.000
Research integrity0.0000.000
Insufficient payload (model declined to judge)0.0000.000

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.

Opus teacher head0.005
GPT teacher head0.200
Teacher spread0.195 · how far apart the two teachers sit on this one work
Validation statusscore_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it

Classification

machine, unvalidated

Machine predicted; a candidate call from one teacher head, not a consensus.

The models applied no category: nothing in the taxonomy fit this work.
Study designTheoretical or conceptual
Domainnot available
GenreEmpirical

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".

Quick stats

Citations0
Published2025
Admission routes1
Has abstractyes

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