moon of Uranus
Enable an agent to recognise a natural satellite of Uranus, assess evidence about its orbit and physical state, and plan observations while preserving uncertainty.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
recalled by Codex without web access - no source was read
Researched by: Codex
Purpose and description
Enable an agent to recognise a natural satellite of Uranus, assess evidence about its orbit and physical state, and plan observations while preserving uncertainty.
A moon of Uranus is a natural satellite gravitationally bound to Uranus and orbiting it within the planet's satellite system.
It can be Resolve names and provisional designations to one satellite identity.; Assess whether detections support membership in the Uranian satellite system.; Predict apparent position and illumination using a dated orbit solution.; Select observation windows that account for Uranus glare, ring overlap and ephemeris uncertainty.; Compare orbital or physical hypotheses against measurements and their limitations.; Identify follow-up observations that could resolve uncertain classification, composition or activity..
Distinguishing features
Evidence supports a natural body gravitationally bound to Uranus rather than a transient close encounter or a projected background source.
Repeated detections can be associated with a persistent individual body rather than a ring arc, diffuse structure or imaging artefact.
Its primary is Uranus; apparent proximity to Uranus alone does not establish membership.
Natural origin separates the body from an artificial Uranus orbiter.
A designation or discovery claim is supported by an orbit solution or explicitly retained as a candidate rather than treated as confirmation.
Scope
+ Satellite identity, designations and evidence that Uranus is its primary
+ Uranus-centred orbital motion and dynamical classification
+ Size, shape, mass, rotation and physical composition where constrained
+ Surface, interior and activity interpretations supported by observations
+ Observation planning, measurement provenance and uncertainty
- Uranus as a planet, including its global atmospheric and interior models
- The Uranian ring system as a collective structure
- Artificial spacecraft orbiting or visiting Uranus
- Heliocentric bodies that merely pass near Uranus
- Other planets' natural satellites except as comparative evidence
- Mission engineering and spacecraft operations
Characteristics
- Satellite identity and recognition status
- Candidate, provisionally designated or named; responsible authority and assessment date Prevents duplicate identities and distinguishes a detection claim from an established satellite.
- Primary-body relationship
- Uranus; supporting astrometry, orbit solution and confidence Establishes the defining relationship for membership in this registered kind.
- Orbit solution
- Position in km and velocity in km/s, or orbital elements; epoch, reference frame, uncertainties and solution type Supports identification, prediction and analysis without confusing incompatible orbital representations.
- Orbital orientation and dynamical grouping
- Prograde or retrograde in a stated frame; regular, irregular or unresolved under an explicit classification Separates orbital descriptions from hypotheses about formation or capture.
- Size and shape
- Radius or principal-axis dimensions in km; resolved measurement or assumed-albedo estimate Distinguishes measured geometry from size inferred through brightness assumptions.
- Mass and bulk density
- Mass in kg or gravitational parameter in km³/s²; density in kg/m³; uncertainty or upper limit Constrains gravitational interactions and interior interpretations when sufficient evidence exists.
- Rotation and illumination geometry
- Rotation period in h; pole direction in a stated frame; subsolar latitude and phase angle in degrees Connects rotation and Uranian seasonal geometry to observable terrain and thermal conditions.
- Surface-material interpretation
- Spectrally supported materials, tentative assignments or unconstrained; wavelength coverage and terrain association Keeps material identifications tied to diagnostic evidence rather than assumed similarity to other moons.
- Geological and interior interpretation
- Observed features and separately recorded hypotheses; supported, tentative, disputed or unconstrained Prevents inferred activity, differentiation or subsurface liquid from becoming unsupported facts.
- Observational accessibility
- Apparent magnitude by band, angular separation from Uranus in arcsec, angular size in mas and ephemeris uncertainty Determines whether a proposed instrument can detect, distinguish or resolve the satellite.
Where this came from
wikidata · CC0 1.0
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 6 bundles · 11 layers · 18 findings · 28 questions.
Uranian membership and identity Establishes which individual body is being described and why it qualifies as a natural satellite of Uranus.
Apparent proximity, discovery reports and changing designations must not create false or duplicate satellites.
Designation and detection history
Connects names and designations to traceable detections of one body.
Identity evidence
Record the evidence connecting discovery detections, later recoveries and adopted designations.
- Which authority or publication assigns each name or provisional designation to this satellite? provenance
- What evidence establishes that detections from different epochs concern the same body? boundary
Natural satellite membership
Tests natural origin and the gravitational relationship to Uranus.
Membership evidence
Separate confirmed membership from unresolved candidates, ring structures and passing objects.
- What astrometric arc and dynamical analysis support a bound orbit about Uranus? measurement
- What evidence distinguishes this source from an artificial object, ring feature or unrelated background body? boundary
Uranus-centred orbit and interactions Describes motion relative to Uranus and interactions within its satellite and ring system.
Reference-frame choices and neighbouring bodies affect classification, predictions and stability interpretations.
Orbit representation
Makes the orbit reproducible and its orientation interpretable.
Dated orbit solution
Record the fitted orbit with the conventions and uncertainties needed to use it.
- What epoch, origin, reference plane and element convention define the Uranus-centred orbit? definition
- How uncertain are the orbital parameters and predicted positions over the intended observation interval? measurement
Satellite and ring coupling
Assesses relationships to neighbouring moons and Uranian rings without assuming interaction from proximity.
Dynamical relationships
Record supported resonances, perturbations and stability constraints separately from proposed ones.
- Which interactions with Uranus, other moons or rings are supported by observations or dynamical calculations? provenance
- What calculation and time interval support any claimed resonance, ring influence or orbital instability? measurement
Physical body and rotation Characterises the individual moon's geometry, gravitational properties and rotational state.
A faint unresolved satellite and a well-observed large moon require different levels of physical inference within the same model.
Dimensions and gravity
Distinguishes direct constraints from quantities inferred through assumptions.
Size, mass and density constraints
Preserve the measurement method and dependencies behind physical estimates.
- Is the reported size based on resolved images, occultation, thermal emission or brightness with an assumed albedo? provenance
- Are mass and volume independently constrained well enough to report a meaningful bulk density? measurement
Spin and seasonal exposure
Connects satellite rotation to illumination and viewing geometry in the Uranian system.
Rotation and terrain visibility
Record measured rotational behaviour and distinguish observed terrain from unseen regions.
- What observations establish the spin period, pole orientation or synchronous rotation rather than merely assuming them? measurement
- How do Uranus's seasonal geometry and the moon's spin determine which terrain is illuminated and observable at the target epoch? action
Surface, interior and environment Connects observable terrain and spectra to carefully qualified physical interpretations.
Evidence for materials, geological history or internal activity must remain specific to the moon and its observational coverage.
Surface record
Organises terrain observations and material identifications by location and observing conditions.
Terrain and material evidence
Separate directly observed morphology and spectral signatures from interpretations of their origin.
- Which terrain features or spectral signatures are actually observed, at what resolution and over what fraction of the surface? measurement
- Which proposed materials are diagnostically supported, and which remain ambiguous because of mixing, irradiation or limited spectral coverage? boundary
Interior and environmental processes
Assesses internal processes and exposure to the Uranian environment through explicit evidence chains.
Process hypotheses
Record hypotheses about heating, internal structure and environmental alteration without treating them as settled observations.
- What moon-specific evidence constrains differentiation, tidal heating, past activity or possible subsurface liquid? provenance
- What evidence distinguishes effects of Uranus's magnetospheric environment from impacts, solar exposure or internal processes? boundary
Observation and evidence management Turns uncertain satellite knowledge into practical observation choices and defensible updates.
Glare from Uranus, projected ring overlap and incomplete coverage can limit both detection and interpretation.
Observation feasibility
Evaluates whether a proposed observation can distinguish the moon and measure the intended property.
Uranus-relative observation window
Use predicted geometry and instrument capability to select informative observations.
- At the proposed epoch, what are the moon's brightness, separation from Uranus and projected overlap with rings or other moons? measurement
- Which instrument, wavelength band and timing can achieve the required detection or spatial resolution under those conditions? action
Evidence revision
Preserves the limits of available observations and guides updates when new data arrive.
Coverage and conflicting estimates
Track competing estimates, observational gaps and the evidence needed to resolve them.
- Which estimates share underlying observations or assumptions, and which provide independent constraints? provenance
- Which follow-up observation would best resolve the most consequential uncertainty about this moon? action
Evidence and external alignment What the world already says about this thing, gathered so the model can be checked against it.
A model that cannot be lined up against existing standards, identifiers and practice cannot be adopted by anyone who already uses them.
Reported evidence
Findings from the breadth pass, kept separate from the structural claims.
Check these first
Recalled without web access and unsourced; every item is a lead to verify.
- This describes a class of objects, not one particular named moon.
- The measurements apply only to the five major moons; small inner moons and distant irregular satellites fall outside these ranges.
- This is recalled knowledge without source verification; current satellite counts, recently assigned names and evidence for subsurface oceans require checking.
- Which of these check these first hold for the sense of moon of Uranus this model covers, and on what evidence? provenance
Kinds and varieties
Recalled without web access and unsourced; every item is a lead to verify.
- Inner small regular satellites
- Major regular satellites: Miranda, Ariel, Umbriel, Titania and Oberon
- Outer irregular satellites
- Which of these kinds and varieties hold for the sense of moon of Uranus this model covers, and on what evidence? provenance
Identifiers and schemes
Recalled without web access and unsourced; every item is a lead to verify.
- IAU provisional satellite designation - S/YYYY U N - YYYY is the discovery year, U identifies Uranus, and N is a sequential discovery number; conventionally written as, for example, S/1986 U 1.
- Permanent satellite designation - Uranus followed by a Roman numeral - For example, Uranus I designates Ariel; the numeral does not indicate current orbital distance order.
- Which of these identifiers and schemes hold for the sense of moon of Uranus this model covers, and on what evidence? provenance
Standards and regulation
Recalled without web access and unsourced; every item is a lead to verify.
- International Astronomical Union naming convention: Uranian moons receive names drawn from characters in the works of William Shakespeare and Alexander Pope.
- Which of these standards and regulation hold for the sense of moon of Uranus this model covers, and on what evidence? provenance
Real-world use
Recalled without web access and unsourced; every item is a lead to verify.
- Investigating the formation and evolution of planetary satellite systems.
- Studying tidal interactions, orbital resonances and ring-satellite dynamics.
- Investigating icy surface geology and possible subsurface oceans.
- Constraining Uranus's gravitational field and system mass through satellite orbital observations.
- Which of these real-world use hold for the sense of moon of Uranus this model covers, and on what evidence? provenance
Typical measurements
Recalled without web access and unsourced; every item is a lead to verify.
- Mean diameter of the five major moons - Approximately 470-1580 - km
- Orbital period of the five major moons - Approximately 1.41-13.46 - Earth days
- Orbital semimajor axis of the five major moons, measured from Uranus's centre - Approximately 130000-584000 - km
- Which of these typical measurements hold for the sense of moon of Uranus this model covers, and on what evidence? provenance
Failure modes and hazards
Recalled without web access and unsourced; every item is a lead to verify.
- Dynamical studies indicate that some closely spaced inner moons may undergo orbit crossing and collisions over long timescales; predicted timing depends on uncertain masses and model assumptions.
- Which of these failure modes and hazards hold for the sense of moon of Uranus this model covers, and on what evidence? provenance
Neighbouring kinds and how to tell them apart
Recalled without web access and unsourced; every item is a lead to verify.
- Natural satellite - The broader category includes natural satellites of other bodies; this entry requires Uranus as the primary.
- Moon - The capitalized proper name denotes Earth's natural satellite, whereas this entry covers natural satellites of Uranus.
- Ring particle of Uranus - A ring particle is treated as a constituent of a distributed ring, whereas a moon is catalogued as an individual satellite; the size boundary is not universal.
- Artificial satellite of Uranus - An artificial satellite would be human-made; a moon is naturally occurring.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of moon of Uranus this model covers, and on what evidence? provenance
What the second pass must settle
- Which authoritative catalogue and dated evidence establish the current membership and designation status of Uranian satellite candidates?
- Which explicit criteria should govern regular or irregular classification where orbital properties do not yield an unambiguous grouping?
- How should the boundary between an individual small satellite and a persistent ring-associated clump be assessed in marginal cases?
- For each moon, which physical properties are independently measured and which depend on assumed albedo, shape, density or rotational state?
- Which proposed interior, activity or origin interpretations remain distinguishable with existing observations, and what additional evidence would settle them?