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Published

star

vr.tr.star · thing-q523

Let an agent describe stars by spectral type, mass, luminosity, distance and evolutionary stage, and identify them across catalogues.

Thing Registry Physical world and living systems PHY.SPC
Bundle → Layer → Finding → QuestionsClassifiersWhat it isWhy it existsDistinguishing featuresWhat robots and AI may and may not doMoral aspectsOwnersLinks to other meta-modelsIdentity and identifiersDirect propertiesRecognitionCapabilities and actionsHazards and failure modesStandards and interfacesContext of useSources

Bundle → Layer → Finding → Questions Filled

4 bundles · 8 layers · 8 findings · 16 questions

Identity Names and catalogue numbers.

Names

Proper names and designations.

Designations

The names and catalogue numbers.

  1. Which designations identify this star? provenance
  2. Is its proper name IAU-approved? provenance

Multiplicity

Single or multiple.

System membership

Whether it is part of a multiple system.

  1. Is this a single star or part of a multiple system? definition
  2. Which component is meant? boundary
Classification Spectral type and stage.

Spectral type

Type and luminosity class.

Spectral class

The spectral classification.

  1. What is its spectral type and luminosity class? definition
  2. How was it classified? provenance

Evolutionary stage

Main sequence, giant, remnant.

Stage

The stage of evolution.

  1. What evolutionary stage is it in? definition
  2. How will it evolve? definition
Physical properties Mass, temperature and distance.

Parameters

Mass, radius, temperature, luminosity.

Parameters

Measured or derived values.

  1. What are its mass, radius, temperature and luminosity? measurement
  2. Which are measured and which modelled? provenance

Distance

Parallax and other methods.

Distance

The distance and method.

  1. How far away is it, and by which method? measurement
  2. What is the uncertainty? measurement
Observation Seeing and using it.

Visibility

Magnitude and position.

Visibility

Brightness and when it is visible.

  1. What is its apparent magnitude, and when is it visible? measurement
  2. In which constellation is it? definition

Variability

Changes in brightness.

Variability

Whether it varies.

  1. Is its brightness variable, with what period? measurement
  2. What causes the variation? definition

Classifiers Filled

Family
Thing Registry
Category
Physical world and living systems
Entry kind
thing
Plane
PHY
Domain
PHY.SPC
Other names and narrower kinds
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

What it is Filled

A luminous sphere of plasma held together by its own gravity, producing energy by nuclear fusion in its core for most of its life.

Why it exists Filled

Let an agent describe stars by spectral type, mass, luminosity, distance and evolutionary stage, and identify them across catalogues.

Distinguishing features Filled

  • Self-luminous through fusion, unlike planets
  • Classified on the Hertzsprung-Russell diagram
  • Evolves through stages from protostar to remnant
  • The Sun is a star

What robots and AI may and may not do Filled

Must not

  • 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.

Only with a human decision

  • Correcting a published catalogue record that others rely on.

May

  • Report a star's designation, position, magnitude and type from astronomical catalogues.
  • Explain whether a magnitude is apparent or absolute.

Moral aspects Filled

  • Selling star names exploits trust and grief; honesty about naming protects people.
  • Stars belong to everyone's sky, and light pollution takes them away.

Who is affected

  • Buyers of novelty star names
  • Sky watchers and astronomers

Owners Filled

Steward

Nobody owns a star; the International Astronomical Union governs official names.

Master systems

  • Star catalogues maintained by the astronomical community

Links to other meta-models Filled

parent

  • Q1027098 - registry parent class
  • Q1146001 - registry parent class
  • Q6999 - registry parent class

related

  • astronomical object - the most studied class
  • planet - planetary systems orbit stars
  • galaxy - stars group into galaxies
  • star as celebrity or symbol - homonyms

What else AI and robots need to interact with it Filled

Identity and identifiers required Filled

  • 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

Direct properties required Filled

  • mass: 0.08-150+ solar masses
  • surface temperature: 2000-50000 K
  • luminosity: 10^-4 to 10^6 solar luminosities

Recognition required Filled

  • 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 and actions required Filled

  • 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 and failure modes required Filled

  • Believing purchased star names are official
  • Mixing apparent and absolute magnitude
  • Treating a binary system as one star

Standards and interfaces required Filled

  • IAU Working Group on Star Names
  • Commercial "star naming" has no official standing

Context of use required Filled

  • 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 Filled

  1. Wikidata item Q523: star - identity and sense of the item
  2. Wikipedia: Star - general description of the item

Open questions

  • Should named stars be registered as instances with Gaia identifiers?
  • How should multiple star systems be modelled?
  • Which spectral classification version should be used?

Machine files

Card as JSON Specification Card backlog vercy.card/1

Provenance

thing registry research (pass 2) · unreviewed

Built from: models/things/publications/thing-q523/spec.json