moon of Mars
Enable an AI agent to recognise a natural satellite of Mars, assess its observed physical and orbital state, and judge the feasibility of observation or spacecraft interaction.
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 AI agent to recognise a natural satellite of Mars, assess its observed physical and orbital state, and judge the feasibility of observation or spacecraft interaction.
A moon of Mars is a natural satellite gravitationally bound to Mars, with Phobos and Deimos being the two known members of this class.
It can be Resolve a designation or observation to an individual natural satellite of Mars.; Predict visibility, occultations and illumination from a specified orbital solution.; Compare surface regions as observation, landing or sampling targets.; Assess candidate approach and surface-contact actions using local gravity, terrain and uncertainty.; Compare origin hypotheses against compositional, structural and dynamical evidence..
Distinguishing features
The candidate is a naturally occurring body rather than manufactured spacecraft or mission debris.
An orbital solution supports sustained motion gravitationally bound to Mars rather than a flyby or apparent proximity.
Mars is the body's immediate planetary primary; merely sharing Mars's heliocentric orbital region is insufficient.
The referent is a discrete satellite body rather than a surface feature of Mars or a diffuse dust population.
Scope
+ Membership in the class of natural satellites gravitationally bound to Mars
+ Mars-relative orbit, rotation and their evolution
+ Satellite shape, mass, gravity and internal-structure evidence
+ Surface terrain, regolith, composition and exposure environment
+ Observation, proximity operations and surface-interaction constraints
- Mars as a planet, including its geology and atmosphere except where they affect a satellite
- Artificial satellites and spacecraft orbiting Mars
- Heliocentric asteroids that merely approach Mars
- Mission hardware design and mission programme management
- Detached dust populations and rings as independent physical systems
Characteristics
- Satellite identity and membership evidence
- Designation and aliases; confirmed, candidate or disputed membership Connects observations to one body and prevents an uncertain detection from becoming an assumed moon.
- Primary body
- Mars, supported by an orbital solution Defines membership in this registry kind.
- Mars-relative orbital solution
- Position in km and velocity in km/s, or orbital elements; epoch, reference frame and uncertainty required Supports identification, prediction of visibility and spacecraft encounter planning.
- Shape and dimensions
- Principal dimensions in km; shape model with body-fixed frame and resolution An irregular body's local surface and clearance cannot be represented adequately by one radius.
- Gravitational parameter
- km³/s², with uncertainty and estimation method Constrains trajectories, surface attraction and interpretations of bulk density.
- Rotation state
- Spin period in h, pole orientation in degrees, libration and evidence for or against synchronous rotation Determines which terrain faces Mars, the Sun and approaching spacecraft.
- Surface material evidence
- Spectral classes, inferred constituents and regolith descriptions, each with confidence and spatial coverage Supports scientific interpretation and contact planning without treating remote inference as direct sampling.
- Local surface environment
- Temperature in K, effective acceleration in m/s² and illumination or eclipse duration in s; location and epoch required Constrains instrument operation, landing, anchoring and material disturbance.
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 · 17 findings · 28 questions.
Martian satellite identity Establishes which natural body is represented and why it qualifies as a moon of Mars.
Apparent proximity to Mars, a provisional detection and an established natural satellite require different treatment.
Designation and observations
Connects names and detections to a single satellite.
Identity evidence
Record designation authority, aliases and the observations that establish continuity of identity.
- Which designation and aliases identify this body, and which authority or publication establishes them? provenance
- Which observations demonstrate that separate detections refer to the same satellite? provenance
Natural satellite boundary
Tests natural origin and Mars-bound satellite status.
Mars-bound membership
Require evidence for a natural body orbiting Mars and retain uncertainty about ambiguous membership.
- What evidence distinguishes this body from an artificial Mars orbiter or mission debris? boundary
- Over what observational interval does the orbital solution establish bound motion around Mars rather than a passing encounter? measurement
Mars-relative dynamics Describes orbital motion, rotation and interactions with Mars.
A Martian moon's state and accessibility depend on its orbit and orientation within the Mars system.
Orbit and prediction
Makes position estimates and their limits explicit.
Orbital solution validity
Record a traceable Mars-relative ephemeris or orbital solution with uncertainty and a usable time interval.
- Which epoch, reference frame, Mars gravity model and observations underlie the orbital solution? provenance
- How does predicted position uncertainty grow over the proposed observation or encounter interval? measurement
Rotation and tidal evolution
Relates surface orientation and long-term dynamics to Mars.
Spin-orbit behaviour
Distinguish measured rotation and orbital change from assumptions about tidal locking or future evolution.
- What measurements constrain spin, pole direction and libration relative to the Mars-facing orientation? measurement
- What evidence constrains orbital drift, and which assumptions control any projected inward or outward evolution? provenance
Body structure and origin Connects shape and gravity measurements to internal structure and formation hypotheses.
The model must support physical interaction while preventing uncertain origin explanations from becoming defining properties.
Shape, mass and gravity
Describes the satellite as an extended body within Mars's gravitational environment.
Resolved physical body
Record compatible shape and gravity estimates rather than assuming a spherical surface or uniform density.
- Which shape model resolves the body's dimensions and terrain, and where are its largest coverage gaps? measurement
- Which measurements constrain gravitational parameter and bulk density, and how do their uncertainties affect local gravity estimates? measurement
Interior and formation evidence
Separates physical observations from interpretations of assembly and origin.
Origin hypothesis comparison
Track competing explanations for the satellite's origin against composition, structure and orbital evidence.
- Which observations constrain porosity, internal coherence or layering, and which conclusions remain model-dependent? provenance
- Which evidence discriminates among proposed capture, impact-related or other formation histories for this Martian satellite? provenance
Surface and Mars-system exposure Describes terrain, surface materials and environmental conditions across the satellite.
Scientific interpretation and surface access require local evidence, including effects of orientation and eclipses by Mars.
Terrain and regolith
Locates surface features and characterises material at the scale of intended use.
Local surface properties
Tie terrain and regolith assessments to mapped regions, spatial resolution and measurement methods.
- Where are slopes, craters, boulders and other relevant terrain features resolved in the body-fixed map? measurement
- What evidence constrains regolith grain size, depth and mechanical behaviour at a proposed contact site? provenance
Composition and exposure
Connects material interpretation to illumination, thermal conditions and surface alteration.
Surface observation context
Preserve the observing conditions needed to interpret spectra and thermal measurements.
- Which surface constituents are supported by measurements, and how do viewing geometry and surface alteration limit identification? provenance
- How do rotation, seasonal geometry and eclipses by Mars affect illumination and temperature at the region of interest? measurement
Observation and spacecraft interaction Translates satellite state and uncertainty into constraints on observation and physical access.
An agent needs to judge specific actions in the combined environment of the moon and Mars.
Remote observation
Determines when a target region can be measured from a specified observer.
Observation opportunity
Evaluate visibility and achievable measurement quality using observer geometry and satellite orientation.
- When is the target region visible and sufficiently illuminated from the specified observer, accounting for Mars occultation and eclipse? action
- What spatial resolution, phase angle and positional uncertainty would the proposed observation have? measurement
Proximity and surface contact
Assesses approach, landing, anchoring and sampling against local conditions.
Interaction feasibility
Require local terrain and dynamical evidence before judging an interaction feasible.
- Which approach or station-keeping trajectories are feasible when Mars's gravity, the moon's irregular gravity and rotation are included? action
- What limits do effective surface gravity, material strength and terrain uncertainty place on touchdown, anchoring or sampling? action
- Could material disturbed by the proposed action escape the local surface or recontact the spacecraft, and what analysis supports that assessment? 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 the class of natural Martian satellites, not one unspecified individual moon.
- The origins of Phobos and Deimos remain unsettled; capture and formation from impact-generated debris should not be presented as established explanations.
- Numerical values are approximate recall values; precision work should verify reference conventions and adopted physical parameters.
- Which of these check these first hold for the sense of moon of Mars this model covers, and on what evidence? provenance
Identifiers and schemes
Recalled without web access and unsourced; every item is a lead to verify.
- Roman-numeral planetary satellite designation - Mars I (Phobos); Mars II (Deimos) - These designate individual moons, not varieties of moon.
- Which of these identifiers and schemes hold for the sense of moon of Mars this model covers, and on what evidence? provenance
Standards and regulation
Recalled without web access and unsourced; every item is a lead to verify.
- The International Astronomical Union, through its Working Group for Planetary System Nomenclature, oversees official names for planetary satellites and their surface features.
- Which of these standards and regulation hold for the sense of moon of Mars this model covers, and on what evidence? provenance
Real-world use
Recalled without web access and unsourced; every item is a lead to verify.
- Studying the origin and evolution of the Martian satellite system.
- Investigating tidal interactions between Mars and its satellites.
- Using spacecraft observations to constrain satellite shape, gravity, surface composition and regolith properties.
- Which of these real-world use hold for the sense of moon of Mars 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 - Approximately 22 for Phobos and 12 for Deimos; both are irregularly shaped - km
- Orbital semimajor axis measured from the centre of Mars - Approximately 9376 for Phobos and 23463 for Deimos - km
- Sidereal orbital period - Approximately 7.65 for Phobos and 30.3 for Deimos - hours
- Which of these typical measurements hold for the sense of moon of Mars 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.
- Phobos undergoes tidal orbital decay and is expected eventually to break apart or collide with Mars.
- Weak surface gravity and irregular shapes complicate spacecraft landing, anchoring and operations near either moon.
- Which of these failure modes and hazards hold for the sense of moon of Mars 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 class includes bodies orbiting other primary bodies; a moon of Mars specifically orbits Mars.
- Phobos - An individual member of the class: the larger, inner Martian moon.
- Deimos - An individual member of the class: the smaller, outer Martian moon.
- artificial satellite of Mars - A manufactured object placed in Martian orbit, rather than a naturally occurring body.
- Mars Trojan asteroid - Orbits the Sun in a 1:1 resonance with Mars rather than orbiting Mars as a satellite.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of moon of Mars this model covers, and on what evidence? provenance
What the second pass must settle
- Does the existing Vercy catalogue already contain a natural-satellite or Martian-moon model that this entry should reference or specialise?
- Which authoritative designation records and orbital solutions establish the current confirmed membership of this kind?
- Which shape, gravity and rotation models provide sufficient coverage and uncertainty estimates for each member?
- Which formation and internal-structure hypotheses remain compatible with the available evidence?
- Which surface mechanical properties and disturbed-material behaviours remain insufficiently measured for reliable contact planning?