{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.wm-spc-002","code":"wm-spc-002-celestial-body","url":"https://ver.cy/models/wm-spc-002-celestial-body/","name":"Celestial Body","alternateNames":[],"kind":"world-model","status":"todo","version":"unversioned","language":"en","classifiers":{"family":"World Models","category":"Physical world and living systems","entryKind":"standalone-mm","plane":"","domain":["PHY.SPC.BDY"],"industry":["Cross-industry"],"navPath":"NAV.PHY.SPC.BDY","tags":["celestial","body","phy.spc.bdy"],"facets":{}},"whatItIs":"A celestial body is a natural object in space, such as a star, planet, dwarf planet, moon, asteroid or comet, identified and characterized by its orbit and physical properties. The class covers natural bodies only; artificial satellites and debris are orbital objects, and observations of a body are recorded as observations.","purpose":"Natural objects in space identified and characterised by orbit and physical properties.","scope":{"in":[],"out":[],"boundaries":[]},"distinguishingFeatures":["It covers natural bodies only; artificial satellites and debris are described as orbital objects.","Identity rests on designations from recognized authorities and on an orbit linking observations.","Orbits and physical parameters are estimates with uncertainty that change as observations accumulate.","It differs from an astronomical observation, which is a single measurement of one or more bodies."],"structure":{"bundles":[{"id":"SPC002-B1","name":"Identity and classification","description":"Which body this is and what kind it is.","layers":[{"id":"SPC002-B1-L1","name":"Designation and class","description":"Designations, names and dynamical or physical class.","findings":[{"id":"SPC002-F01","name":"Designation","description":"The official designation and name with the authority that assigned them.","questions":[{"text":"What designation and name has the responsible authority assigned to this body?","id":"SPC002-Q01"},{"text":"Has the body been linked to or merged with an earlier provisional designation?","id":"SPC002-Q02"}]},{"id":"SPC002-F02","name":"Classification","description":"The body's class, such as planet, moon, near-Earth asteroid or comet.","questions":[{"text":"Which class does the body belong to, and on which criteria?","id":"SPC002-Q03"},{"text":"Is the classification disputed or recently changed?","id":"SPC002-Q04"}]}]}]},{"id":"SPC002-B2","name":"Orbit and physical properties","description":"Where the body moves and what it is like.","layers":[{"id":"SPC002-B2-L1","name":"Orbit","description":"Orbital elements, epoch and uncertainty.","findings":[{"id":"SPC002-F03","name":"Orbit solution","description":"A set of orbital elements with epoch and uncertainty.","questions":[{"text":"What are the current orbital elements, and at which epoch?","id":"SPC002-Q05"},{"text":"How many observations and what arc length support the orbit, and how uncertain is it?","id":"SPC002-Q06"}]}]},{"id":"SPC002-B2-L2","name":"Physical characterization","description":"Size, mass, rotation and composition.","findings":[{"id":"SPC002-F04","name":"Physical parameters","description":"Measured or estimated size, mass, albedo and rotation period.","questions":[{"text":"Which physical parameters are measured and which are only estimated?","id":"SPC002-Q07"},{"text":"Which observations or missions provided the measurements?","id":"SPC002-Q08"}]}]}]},{"id":"SPC002-B3","name":"Risk and access","description":"Whether the body matters for Earth and missions.","layers":[{"id":"SPC002-B3-L1","name":"Close approaches and missions","description":"Close approaches, impact assessment and mission targeting.","findings":[{"id":"SPC002-F05","name":"Impact assessment","description":"Close approach and impact probability assessments for near-Earth objects.","questions":[{"text":"Does the body make close approaches to Earth, and what impact assessment is published?","id":"SPC002-Q09"},{"text":"Which official assessment body is responsible for the risk rating?","id":"SPC002-Q10"}]}]}]}]},"agentConduct":{"may":["Retrieve designations, orbital elements and physical parameters from authoritative catalogues.","Compute positions from published orbits and report their uncertainty.","Link observations to known bodies and report candidate new objects.","Summarize published close approach and impact assessments."],"mustNot":["Announce an impact threat that the responsible assessment bodies have not published.","Assign official names or designations, which are reserved to the recognized authority.","Present estimated physical parameters as measured.","Use outdated orbits for navigation or risk statements without stating their epoch."],"requiresHuman":["Reporting a potential new discovery to the responsible authority.","Communicating impact risk to the public or to emergency services.","Selecting a body as a mission target."]},"ethics":{"considerations":["False or exaggerated impact claims can cause public alarm and erode trust in science.","Naming of bodies and surface features can carry cultural meaning and should respect naming rules.","Claims to resources on celestial bodies raise questions of fairness under space law."],"affectedParties":["The general public","Astronomers and observers","Space agencies and mission teams"]},"owners":{"steward":"The international astronomical authority responsible for designations and nomenclature, with data centres that maintain orbit and physical catalogues.","roles":[],"masterSystems":["Minor body orbit catalogues","Planetary nomenclature gazetteers","Star and exoplanet catalogues","Ephemeris services"]},"relations":[{"target":"world-p11-space-and-orbital-objects","type":"neighbor","note":"Artificial satellites and debris are described there; natural bodies here."},{"target":"wm-spc-003-astronomical-observation","type":"references","note":"Observations of a body are recorded as astronomical observations."},{"target":"wm-spc-004-satellite-mission-programme","type":"related","note":"Missions may target or orbit celestial bodies."}],"interaction":{"identity":{"applicability":"required","items":["A body is identified by its designation from the responsible authority, such as a minor planet number and name or a provisional designation.","Stars are identified by catalogue numbers; ephemeris systems also assign numeric body identifiers."]},"properties":{"applicability":"required","items":["Orbital elements: semi-major axis in astronomical units, eccentricity, inclination in degrees, at a stated epoch.","Diameter or radius in kilometres and mass in kilograms, with uncertainty.","Rotation period in hours and geometric albedo as a dimensionless ratio.","Absolute magnitude for small bodies, measured in a stated photometric band."]},"recognition":{"applicability":"required","items":["A body is recognized by its position and motion consistent with a known orbit, and by brightness and spectrum.","Often confused with artificial satellites, space debris, image artefacts or background stars."]},"capabilities":{"applicability":"required","items":["Its future position can be predicted from its orbit within stated uncertainty.","New observations can be linked to it to refine the orbit.","It can be characterized remotely or by spacecraft visits."]},"hazards":{"applicability":"required","items":["Impact of near-Earth objects on Earth.","False alarms from short-arc orbits with large uncertainty.","Navigation errors for spacecraft using outdated ephemerides."]},"interfaces":{"applicability":"required","items":["IAU designation and nomenclature rules.","Minor Planet Center observation and orbit formats.","SPICE kernels for ephemerides used in mission planning."]},"context":{"applicability":"required","items":["Used in astronomy, planetary science, planetary defence and mission planning.","Activities on and around celestial bodies fall under the Outer Space Treaty."]}},"sources":[{"title":"Gazetteer of Planetary Nomenclature, IAU Working Group for Planetary System Nomenclature and USGS"},{"title":"Minor Planet Center, International Astronomical Union"},{"title":"Treaty on Principles Governing the Activities of States in the Exploration and Use of Outer Space (1967), United Nations"}],"openQuestions":["Planned model: boundary questions, research and every section remain to be written."],"resources":{"spec":"https://ver.cy/models/wm-spc-002-celestial-body/spec.yaml","agents":"https://ver.cy/models/wm-spc-002-celestial-body/AGENTS.md"},"provenance":{"origin":"planned (registry candidate)","builtFrom":["models/runtime-index.json","ver-cy/world-models/card-supplements/wm-spc-002-celestial-body.json"],"providers":[],"researchStatus":"todo","generatedAt":"","builder":"tools/build_cards.py@1.0.0"},"completeness":{"sections":{"classifiers":"filled","whatItIs":"filled","purpose":"filled","distinguishingFeatures":"filled","structure":"filled","agentConduct":"filled","ethics":"filled","owners":"filled","relations":"filled","interaction.identity":"filled","interaction.properties":"filled","interaction.recognition":"filled","interaction.capabilities":"filled","interaction.hazards":"filled","interaction.interfaces":"filled","interaction.context":"filled","sources":"filled"},"notes":{"_":"Planned entry, hidden from the catalogue until researched.","_supplement":"Sections authored in card supplement 1.0.1 by Claude (Opus 5.5) (2026-10-06, unreviewed). Written from the card's existing content and established practice in the field; no new sources were read. Unreviewed."},"score":1.0}}