{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.periodic-comet","code":"thing-q11416914","url":"https://ver.cy/models/thing/q11416914/","name":"periodic comet","alternateNames":["Chiron-type comet","Encke-type comet","Halley-type comet","Jupiter-family comet","350P/McNaught","quasi-Hilda comet"],"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 comet with a stable orbit and an orbital period of less than 200 years, designated with a P; groups include Jupiter-family, Encke-type, Halley-type and Chiron-type comets.","purpose":"Let an agent describe periodic comets by designation, orbit, return dates, brightness predictions and observation, with sourced ephemerides.","scope":{"in":[],"out":[],"boundaries":[]},"distinguishingFeatures":["Returns regularly","Numbered P designations","Brightness is hard to predict","Often perturbed by Jupiter"],"structure":{"bundles":[{"id":"identity","name":"Identity","description":"Which comet.","layers":[{"id":"designation","name":"Designation","description":"Name and number.","findings":[{"id":"designation-finding","name":"Designation","description":"Designation.","questions":[{"text":"What is the comet designation and discoverer?","kind":"provenance"},{"text":"Which family does it belong to?","kind":"definition"}]}]},{"id":"orbit","name":"Orbit","description":"Elements.","findings":[{"id":"orbit-finding","name":"Orbit","description":"Orbit.","questions":[{"text":"What are its period and perihelion distance?","kind":"measurement"},{"text":"From which orbit solution?","kind":"provenance"}]}]}]},{"id":"return","name":"Return","description":"Next apparition.","layers":[{"id":"perihelion","name":"Perihelion","description":"Date.","findings":[{"id":"perihelion-finding","name":"Perihelion","description":"Next perihelion.","questions":[{"text":"When is the next perihelion?","kind":"provenance"},{"text":"How reliable is the prediction?","kind":"boundary"}]}]},{"id":"brightness","name":"Brightness","description":"Magnitude.","findings":[{"id":"brightness-finding","name":"Brightness","description":"Brightness forecast.","questions":[{"text":"What brightness is forecast, and how uncertain is it?","kind":"measurement"},{"text":"Will it need binoculars or a telescope?","kind":"boundary"}]}]}]},{"id":"observing","name":"Observing","description":"Seeing it.","layers":[{"id":"where","name":"Where","description":"Sky position.","findings":[{"id":"where-finding","name":"Where","description":"Sky position.","questions":[{"text":"Where in the sky is it on this date?","kind":"provenance"},{"text":"Which ephemeris service shows it?","kind":"provenance"}]}]},{"id":"report","name":"Report","description":"Observations.","findings":[{"id":"report-finding","name":"Report","description":"Reporting observations.","questions":[{"text":"How can observations or images be submitted?","kind":"action"},{"text":"Which organisation collects them?","kind":"provenance"}]}]}]},{"id":"science","name":"Science","description":"Physics.","layers":[{"id":"composition","name":"Composition","description":"Ices and dust.","findings":[{"id":"composition-finding","name":"Composition","description":"Composition.","questions":[{"text":"What is known about its composition?","kind":"provenance"},{"text":"Has a spacecraft visited it?","kind":"provenance"}]}]},{"id":"showers","name":"Meteor showers","description":"Debris.","findings":[{"id":"showers-finding","name":"Meteor showers","description":"Associated meteor showers.","questions":[{"text":"Is it the parent of a meteor shower?","kind":"provenance"},{"text":"When does the shower peak?","kind":"provenance"}]}]}]}]},"agentConduct":{"may":["Report orbits, designations and apparitions of periodic comets from official catalogues.","Help observers plan sightings with published ephemerides."],"mustNot":["Spread false claims that a comet will strike Earth or cause disasters.","Report a new comet discovery before it is confirmed by the designating body.","Assign or alter official comet designations."],"requiresHuman":["Announcing a possible discovery or close approach to the public."]},"ethics":{"considerations":["Comet scares have caused panic and been used for fraud."],"affectedParties":["The public","Amateur and professional astronomers"]},"owners":{"steward":"Nobody owns them; the international astronomical bodies assign designations and keep orbit records.","roles":[],"masterSystems":["Minor Planet Center orbit databases"]},"relations":[{"target":"Q138568992","type":"parent","note":"registry parent class"},{"target":"comet","type":"related","note":"category"},{"target":"Minor Planet Center","type":"related","note":"authority"},{"target":"Halley's Comet","type":"related","note":"example"},{"target":"long-period comet","type":"related","note":"other class"}],"interaction":{"identity":{"applicability":"required","items":["Vercy registry: vr.tr.periodic-comet","Wikidata: Q11416914 (https://www.wikidata.org/wiki/Q11416914)","MPC comet designation: nP/Name periodic comets"]},"properties":{"applicability":"required","items":["orbital period: under 200 years - definition"]},"recognition":{"applicability":"required","items":["Designations such as 1P/Halley or 2P/Encke","Coma and tail near perihelion","Long-period comets use C/ designations","A fuzzy coma with or without a tail, seen through binoculars or telescopes; rarely naked-eye."]},"capabilities":{"applicability":"required","items":["look up designations and periods","find next perihelion and visibility","distinguish comet families","report observations to databases"]},"hazards":{"applicability":"required","items":["Overpromising brightness","Using outdated ephemerides"]},"interfaces":{"applicability":"required","items":["IAU comet naming rules"]},"context":{"applicability":"required","items":["Solar system science and public observing.","Jupiter-family comets","Encke-type comets","Halley-type comets","Chiron-type comets","quasi-Hilda comets"]}},"sources":[{"title":"Wikidata item Q11416914: periodic comet","url":"https://www.wikidata.org/wiki/Q11416914","note":"identity and sense of the item"},{"title":"Wikipedia: Periodic comet","url":"https://en.wikipedia.org/wiki/Periodic_comet","note":"general description of the item"}],"openQuestions":["Should comet families be separate entries?","How should ephemerides be linked?","How should brightness forecasts be qualified?"],"resources":{"spec":"/models/things/publications/thing-q11416914/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-q11416914/spec.json"],"providers":["Claude"],"researchStatus":"unreviewed","generatedAt":"2026-09-11T10:43:20Z","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 2026-10-07T10:10:25+00:00: completeness 1.00; sense: Wikidata description; 2 live sources; review by codex: pass"},"score":1.0}}