{
  "name": "gcat-artificial-space-objects",
  "title": "GCAT: General Catalog of Artificial Space Objects",
  "description": "Every artificial object ever launched into space — from Sputnik in 1957 to the present — catalogued by Jonathan McDowell. Includes launch date, country, object type (payload, rocket body, debris, component), orbit class, and current status.",
  "version": "1.0.0",
  "licenses": [
    {
      "name": "odc-pddl",
      "title": "Open Data Commons Public Domain Dedication and License",
      "path": "http://opendatacommons.org/licenses/pddl/1.0/"
    }
  ],
  "sources": [
    {
      "title": "GCAT — Jonathan McDowell's General Catalog of Artificial Space Objects",
      "path": "https://planet4589.org/space/gcat/"
    }
  ],
  "resources": [
    {
      "name": "satcat",
      "title": "Satellite Catalog (satcat)",
      "description": "Standard catalog of all artificial space objects. One row per phase; most objects have a single phase. Covers all objects ever tracked in Earth orbit and beyond.",
      "path": "data/satcat.csv",
      "format": "csv",
      "mediatype": "text/csv",
      "encoding": "utf-8",
      "profile": "tabular-data-resource",
      "schema": {
        "fields": [
          {
            "name": "jcat",
            "title": "JCAT ID",
            "description": "Jonathan's Catalog ID — unique GCAT identifier. Prefix letter indicates catalog (S = standard satcat).",
            "type": "string"
          },
          {
            "name": "satcat",
            "title": "NORAD Catalog Number",
            "description": "US Space Force / NORAD catalog number. Not set for all objects.",
            "type": "string"
          },
          {
            "name": "name",
            "title": "Object Name",
            "description": "Official or common name of the space object.",
            "type": "string"
          },
          {
            "name": "launch_date",
            "title": "Launch Date",
            "description": "Date of launch (ISO 8601, YYYY-MM-DD). Partial dates (year only) appear when exact date is uncertain.",
            "type": "string",
            "format": "default"
          },
          {
            "name": "launch_year",
            "title": "Launch Year",
            "description": "Four-digit launch year, extracted from launch_date. Suitable for aggregation.",
            "type": "number"
          },
          {
            "name": "object_type",
            "title": "Object Type",
            "description": "Simplified object classification. Values: Payload, Rocket Body, Debris, Component, Suborbital Payload, Unknown. Derived from the GCAT SatType byte 1.",
            "type": "string",
            "constraints": {
              "enum": ["Payload", "Rocket Body", "Debris", "Component", "Suborbital Payload", "Unknown"]
            }
          },
          {
            "name": "state",
            "title": "State",
            "description": "ISO country code of the owning nation or organization (e.g. US, SU, CN, RU, FR). Historical codes like SU (Soviet Union) are preserved.",
            "type": "string"
          },
          {
            "name": "owner",
            "title": "Owner",
            "description": "Abbreviated name of the owning organization or agency.",
            "type": "string"
          },
          {
            "name": "status",
            "title": "Status",
            "description": "Current or final orbital status. Values: In Orbit, Decayed, Deorbited, Beyond Earth Orbit, Exploded.",
            "type": "string"
          },
          {
            "name": "orbit_class",
            "title": "Orbit Class",
            "description": "Operational orbit category code (e.g. LEO/I, GEO/S, MEO, HEO). See https://planet4589.org/space/gcat/web/intro/orbits.html for definitions.",
            "type": "string"
          },
          {
            "name": "perigee_km",
            "title": "Perigee (km)",
            "description": "Perigee altitude above Earth's surface in kilometres, at last known orbital epoch.",
            "type": "number"
          },
          {
            "name": "apogee_km",
            "title": "Apogee (km)",
            "description": "Apogee altitude above Earth's surface in kilometres, at last known orbital epoch.",
            "type": "number"
          },
          {
            "name": "inclination_deg",
            "title": "Inclination (degrees)",
            "description": "Orbital inclination in degrees, at last known orbital epoch.",
            "type": "number"
          }
        ],
        "missingValues": ["", "-", "?"]
      }
    },
    {
      "name": "objects-per-year",
      "title": "Objects Launched per Year by Type",
      "description": "Pre-aggregated count of objects launched per year, broken down by object type. Used for the bar chart view.",
      "path": "data/objects_per_year.csv",
      "format": "csv",
      "mediatype": "text/csv",
      "encoding": "utf-8",
      "profile": "tabular-data-resource",
      "schema": {
        "fields": [
          {
            "name": "year",
            "title": "Year",
            "type": "number"
          },
          {
            "name": "Payload",
            "title": "Payloads",
            "description": "Number of payloads launched.",
            "type": "number"
          },
          {
            "name": "Rocket Body",
            "title": "Rocket Bodies",
            "description": "Number of rocket bodies (launch vehicle stages) tracked.",
            "type": "number"
          },
          {
            "name": "Debris",
            "title": "Debris",
            "description": "Number of fragmentation debris pieces tracked.",
            "type": "number"
          },
          {
            "name": "Component",
            "title": "Components",
            "description": "Number of payload components tracked.",
            "type": "number"
          }
        ],
        "missingValues": [""]
      }
    }
  ],
  "views": [
    {
      "name": "objects-launched-per-year",
      "title": "70 Years of Space Launches: Objects by Type per Year",
      "resourceName": "objects-per-year",
      "specType": "simple",
      "spec": {
        "type": "bar",
        "group": "year",
        "series": ["Payload", "Rocket Body", "Debris", "Component"]
      }
    }
  ]
}