Asteroid and Comet Close Approaches to Earth by Date Window (NASA JPL)

jplssd/close-approaches

Close approaches of asteroids and comets to Earth in a date window, soonest first: for each the object designation and full name, the close-approach time (TDB), the nominal, minimum and maximum approach distance in astronomical units (1 au is about 149.6 million km; the Moon is about 0.00257 au), the relative velocity and the velocity at infinity in km/s, the time uncertainty, and the absolute magnitude H (smaller is larger; H 22 is roughly 140 m). Filter by a maximum distance in au (default 0.05), an optional maximum H, and a limit of 1 to 100 (default 20). Give dates as YYYY-MM-DD; the start can also be now and the end a number of days ahead such as +30. Also returns the total number of matches. NASA/JPL Solar System Dynamics data, served by Eden Engine; not an official NASA or JPL product.

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Price

$0.0026 per call

You pay the price shown. If a call turns out to cost more than its quote, you pay the actual price, capped at twice the quote. No monthly minimum. Top-ups start at $0.50.

Data source

NASA/JPL Solar System Dynamics

Source: NASA/JPL Solar System Dynamics, Small-Body Database APIs (https://ssd-api.jpl.nasa.gov). U.S. government data. Served by Eden Engine; not an official NASA or JPL product.

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agent

// 1. search: find the tool
omnial_search({ query: "what you need" })

// 2. inspect: price and input schema
omnial_inspect({ tool: "jplssd/close-approaches" })

// 3. learn: read the usage guide at runtime
omnial_learn({ tool: "jplssd/close-approaches" })

// 4. run: price the exact call first, then run it
omnial_execute({ tool: "jplssd/close-approaches", input: { /* see input_schema */ }, dry_run: true })
omnial_execute({ tool: "jplssd/close-approaches", input: { /* ... */ } })

// 5. settle: the call is charged when it finishes, nothing to do

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Pricing

Every charge this tool can incur.

Charge	Price
Per call	$0.0026

Updated: Oct 26, 2026

Input and output schemas

Input schema

input_schema.json

{
  "type": "object",
  "required": [
    "dateMin",
    "dateMax"
  ],
  "properties": {
    "hMax": {
      "type": "number",
      "maximum": 40,
      "minimum": 0,
      "description": "Largest absolute magnitude H to include; a lower value keeps only larger objects. Leave out for all sizes."
    },
    "limit": {
      "type": "integer",
      "default": 20,
      "maximum": 100,
      "minimum": 1,
      "description": "Most approaches to return, 1 to 100. Default 20."
    },
    "dateMax": {
      "type": "string",
      "pattern": "^(?:\\+\\d{1,4}|\\d{4}-\\d{2}-\\d{2})$",
      "description": "End of the window: YYYY-MM-DD, or days ahead of the start as +30."
    },
    "dateMin": {
      "type": "string",
      "pattern": "^(?:now|\\d{4}-\\d{2}-\\d{2})$",
      "description": "Start of the window: YYYY-MM-DD, or now."
    },
    "distMax": {
      "type": "number",
      "default": 0.05,
      "maximum": 1,
      "minimum": 0.0001,
      "description": "Largest approach distance to include, in astronomical units. Default 0.05 (about 19 Moon distances)."
    }
  },
  "additionalProperties": false
}

Output schema

output_schema.json

{
  "type": "object",
  "required": [
    "count",
    "total",
    "approaches"
  ],
  "properties": {
    "count": {
      "type": "integer",
      "description": "Approaches in this answer."
    },
    "total": {
      "type": "integer",
      "description": "Approaches matching the window before the limit."
    },
    "approaches": {
      "type": "array",
      "items": {
        "type": "object",
        "required": [
          "designation",
          "closeApproachTime",
          "distanceAu"
        ],
        "properties": {
          "orbitId": {
            "type": [
              "string",
              "null"
            ],
            "description": "Orbit solution identifier."
          },
          "fullName": {
            "type": [
              "string",
              "null"
            ],
            "description": "Full name with designation."
          },
          "distanceAu": {
            "type": "number",
            "description": "Nominal approach distance in astronomical units."
          },
          "julianDate": {
            "type": [
              "number",
              "null"
            ],
            "description": "Close-approach time as a Julian date (TDB)."
          },
          "designation": {
            "type": "string",
            "description": "Object designation, for example 2026 TT3."
          },
          "distanceMaxAu": {
            "type": [
              "number",
              "null"
            ],
            "description": "Maximum plausible approach distance, au."
          },
          "distanceMinAu": {
            "type": [
              "number",
              "null"
            ],
            "description": "Minimum plausible approach distance, au."
          },
          "timeUncertainty": {
            "type": [
              "string",
              "null"
            ],
            "description": "3-sigma uncertainty of the approach time, for example < 00:01 or 03:12."
          },
          "absoluteMagnitude": {
            "type": [
              "number",
              "null"
            ],
            "description": "Absolute magnitude H; smaller means larger."
          },
          "closeApproachTime": {
            "type": "string",
            "description": "Close-approach time (TDB) as YYYY-Mon-DD HH:MM."
          },
          "relativeVelocityKmS": {
            "type": [
              "number",
              "null"
            ],
            "description": "Velocity relative to Earth at approach, km/s."
          },
          "velocityInfinityKmS": {
            "type": [
              "number",
              "null"
            ],
            "description": "Velocity relative to Earth at infinity, km/s."
          }
        },
        "additionalProperties": false
      },
      "description": "Approaches soonest first; empty when nothing matches."
    }
  },
  "additionalProperties": false
}