Near Earth Object

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://github.com/api-evangelist/nasa/blob/main/json-schema/near-earth-object.json",
  "title": "Near Earth Object",
  "description": "A near-Earth asteroid tracked by NASA's NeoWs service.",
  "type": "object",
  "properties": {
    "id": {
      "type": "string",
      "description": "Unique identifier for the NEO."
    },
    "neo_reference_id": {
      "type": "string",
      "description": "NEO reference identifier."
    },
    "name": {
      "type": "string",
      "description": "Name or designation of the asteroid."
    },
    "nasa_jpl_url": {
      "type": "string",
      "format": "uri",
      "description": "URL to the NASA JPL page for this object."
    },
    "absolute_magnitude_h": {
      "type": "number",
      "description": "Absolute magnitude (H) of the asteroid."
    },
    "estimated_diameter": {
      "type": "object",
      "description": "Estimated diameter in various units.",
      "properties": {
        "kilometers": { "$ref": "#/$defs/diameterRange" },
        "meters": { "$ref": "#/$defs/diameterRange" },
        "miles": { "$ref": "#/$defs/diameterRange" },
        "feet": { "$ref": "#/$defs/diameterRange" }
      }
    },
    "is_potentially_hazardous_asteroid": {
      "type": "boolean",
      "description": "Whether the asteroid is classified as potentially hazardous."
    },
    "close_approach_data": {
      "type": "array",
      "items": { "$ref": "close-approach.json" },
      "description": "List of close approach events."
    },
    "is_sentry_object": {
      "type": "boolean",
      "description": "Whether this object is tracked by the Sentry impact monitoring system."
    }
  },
  "required": ["id", "name", "is_potentially_hazardous_asteroid"],
  "$defs": {
    "diameterRange": {
      "type": "object",
      "properties": {
        "estimated_diameter_min": { "type": "number" },
        "estimated_diameter_max": { "type": "number" }
      }
    }
  }
}