{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.star","code":"thing-q523","url":"https://ver.cy/models/thing/q523/","name":"star","alternateNames":["black neutron star","blitzar","radio star","G-type star","CEMP star","hypervelocity star","pre-main-sequence star","K-type star","solar-type star","peculiar star","S-type star","M-type star"],"kind":"thing","status":"published","version":"0.2.0-wave.1","language":"en","classifiers":{"family":"Thing Registry","category":"Physical world and living systems","entryKind":"thing","plane":"PHY","domain":["PHY.SPC"],"industry":[],"navPath":"","tags":[],"facets":{}},"whatItIs":"A luminous sphere of plasma held together by its own gravity, producing energy by nuclear fusion in its core for most of its life.","purpose":"Let an agent describe stars by spectral type, mass, luminosity, distance and evolutionary stage, and identify them across catalogues.","scope":{"in":[],"out":[],"boundaries":[]},"distinguishingFeatures":["Self-luminous through fusion, unlike planets","Classified on the Hertzsprung-Russell diagram","Evolves through stages from protostar to remnant","The Sun is a star"],"structure":{"bundles":[{"id":"identity","name":"Identity","description":"Names and catalogue numbers.","layers":[{"id":"names","name":"Names","description":"Proper names and designations.","findings":[{"id":"names-finding","name":"Designations","description":"The names and catalogue numbers.","questions":[{"text":"Which designations identify this star?","kind":"provenance"},{"text":"Is its proper name IAU-approved?","kind":"provenance"}]}]},{"id":"multiplicity","name":"Multiplicity","description":"Single or multiple.","findings":[{"id":"multiplicity-finding","name":"System membership","description":"Whether it is part of a multiple system.","questions":[{"text":"Is this a single star or part of a multiple system?","kind":"definition"},{"text":"Which component is meant?","kind":"boundary"}]}]}]},{"id":"classification","name":"Classification","description":"Spectral type and stage.","layers":[{"id":"spectral","name":"Spectral type","description":"Type and luminosity class.","findings":[{"id":"spectral-finding","name":"Spectral class","description":"The spectral classification.","questions":[{"text":"What is its spectral type and luminosity class?","kind":"definition"},{"text":"How was it classified?","kind":"provenance"}]}]},{"id":"stage","name":"Evolutionary stage","description":"Main sequence, giant, remnant.","findings":[{"id":"stage-finding","name":"Stage","description":"The stage of evolution.","questions":[{"text":"What evolutionary stage is it in?","kind":"definition"},{"text":"How will it evolve?","kind":"definition"}]}]}]},{"id":"physical","name":"Physical properties","description":"Mass, temperature and distance.","layers":[{"id":"parameters","name":"Parameters","description":"Mass, radius, temperature, luminosity.","findings":[{"id":"parameters-finding","name":"Parameters","description":"Measured or derived values.","questions":[{"text":"What are its mass, radius, temperature and luminosity?","kind":"measurement"},{"text":"Which are measured and which modelled?","kind":"provenance"}]}]},{"id":"distance","name":"Distance","description":"Parallax and other methods.","findings":[{"id":"distance-finding","name":"Distance","description":"The distance and method.","questions":[{"text":"How far away is it, and by which method?","kind":"measurement"},{"text":"What is the uncertainty?","kind":"measurement"}]}]}]},{"id":"observation","name":"Observation","description":"Seeing and using it.","layers":[{"id":"visibility","name":"Visibility","description":"Magnitude and position.","findings":[{"id":"visibility-finding","name":"Visibility","description":"Brightness and when it is visible.","questions":[{"text":"What is its apparent magnitude, and when is it visible?","kind":"measurement"},{"text":"In which constellation is it?","kind":"definition"}]}]},{"id":"variability","name":"Variability","description":"Changes in brightness.","findings":[{"id":"variability-finding","name":"Variability","description":"Whether it varies.","questions":[{"text":"Is its brightness variable, with what period?","kind":"measurement"},{"text":"What causes the variation?","kind":"definition"}]}]}]}]},"agentConduct":{"may":["Report a star's designation, position, magnitude and type from astronomical catalogues.","Explain whether a magnitude is apparent or absolute."],"mustNot":["Tell people that a star name bought from a commercial service is official.","Treat a known binary or multiple system as a single star.","Advise looking at the Sun without proper eye protection."],"requiresHuman":["Correcting a published catalogue record that others rely on."]},"ethics":{"considerations":["Selling star names exploits trust and grief; honesty about naming protects people.","Stars belong to everyone's sky, and light pollution takes them away."],"affectedParties":["Buyers of novelty star names","Sky watchers and astronomers"]},"owners":{"steward":"Nobody owns a star; the International Astronomical Union governs official names.","roles":[],"masterSystems":["Star catalogues maintained by the astronomical community"]},"relations":[{"target":"Q1027098","type":"parent","note":"registry parent class"},{"target":"Q1146001","type":"parent","note":"registry parent class"},{"target":"Q6999","type":"parent","note":"registry parent class"},{"target":"astronomical object","type":"related","note":"the most studied class"},{"target":"planet","type":"related","note":"planetary systems orbit stars"},{"target":"galaxy","type":"related","note":"stars group into galaxies"},{"target":"star as celebrity or symbol","type":"related","note":"homonyms"}],"interaction":{"identity":{"applicability":"required","items":["Vercy registry: vr.tr.star","Wikidata: Q523 (https://www.wikidata.org/wiki/Q523)","HD number: Henry Draper catalogue bright stars","Gaia DR3 source id: numeric about 1.8 billion sources","Bayer designation: Greek letter plus constellation for example Alpha Centauri"]},"properties":{"applicability":"required","items":["mass: 0.08-150+ solar masses","surface temperature: 2000-50000 K","luminosity: 10^-4 to 10^6 solar luminosities"]},"recognition":{"applicability":"required","items":["Point sources that do not move against each other over a night, unlike planets","Colour indicates temperature","Bright stars have proper names; most have only catalogue numbers","A point of light in the night sky, twinkling from the ground; colour ranges from blue-white to red."]},"capabilities":{"applicability":"required","items":["observe it, by eye or telescope","classify it, by spectral type and luminosity class","measure it, for distance, mass, temperature and composition","navigate by it, in celestial navigation"]},"hazards":{"applicability":"required","items":["Believing purchased star names are official","Mixing apparent and absolute magnitude","Treating a binary system as one star"]},"interfaces":{"applicability":"required","items":["IAU Working Group on Star Names","Commercial \"star naming\" has no official standing"]},"context":{"applicability":"required","items":["Understanding the universe, navigation, timekeeping and the origin of chemical elements.","by spectral type: O, B, A, F, G, K, M","by luminosity class: supergiant to dwarf","remnants: white dwarf, neutron star, black hole","variable and binary stars"]}},"sources":[{"title":"Wikidata item Q523: star","url":"https://www.wikidata.org/wiki/Q523","note":"identity and sense of the item"},{"title":"Wikipedia: Star","url":"https://en.wikipedia.org/wiki/Star","note":"general description of the item"}],"openQuestions":["Should named stars be registered as instances with Gaia identifiers?","How should multiple star systems be modelled?","Which spectral classification version should be used?"],"resources":{"spec":"/models/things/publications/thing-q523/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-q523/spec.json"],"providers":["Claude"],"researchStatus":"unreviewed","generatedAt":"2026-09-11T04:35:51Z","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":{"_gate":"Published through the thing publication gate 1.0 on 2026-10-06T19:52:00+00:00: completeness 1.00; sense: Wikidata description; 2 live sources; review by codex: pass"},"score":1.0}}