US Space Command

US Space Command Conjunction Data API

Conjunction data messages (collision warnings)

Documentation GitHub OpenAPI

Work with this as data

Every API here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for apis

7 MCP tools reach this

find_apisBrowse and filter every API in the catalog.
get_api_artifactsOne API's artifacts, grouped by type.
get_openapiThe primary OpenAPI for this API.
find_similar_apisAPIs that look like this one.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

All 92 tools

Call it yourself

curl for this page

This API

curl "https://apis.io/api/v1/apis/us-space-comman-conjunction-data-api"

All apis

curl "https://apis.io/api/v1/apis?limit=25"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

Free tier, no email required.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.

OpenAPI Specification

openapi: 3.0.1
info:
  title: Space-Track.org REST Authentication Conjunction Data API
  description: Space-Track.org is the official US Space Command (USSPACECOM) source for space situational awareness data. The REST API provides access to the satellite catalog (SATCAT), orbital element sets (GP/TLEs), conjunction data messages (CDMs), decay predictions (TIP), and space object history. Requires a free account. Authenticate via POST to /ajaxauth/login then use session cookies for subsequent requests.
  version: '1.0'
  contact:
    name: US Space Command / 18th Space Defense Squadron
    url: https://www.space-track.org
servers:
- url: https://www.space-track.org
security:
- sessionCookie: []
tags:
- name: Conjunction Data
  description: Conjunction data messages (collision warnings)
paths:
  /basicspacedata/query/class/cdm_public/format/{format}:
    get:
      tags:
      - Conjunction Data
      operationId: listConjunctionData
      summary: List Conjunction Data Messages (CDM)
      description: Returns publicly available Conjunction Data Messages (CDMs), which are notifications of potential close approaches between tracked objects. Sorted by collision probability descending.
      parameters:
      - name: format
        in: path
        required: true
        schema:
          type: string
          enum:
          - json
          - xml
          - csv
          default: json
      - name: SAT_1_ID
        in: query
        description: NORAD ID of primary object
        schema:
          type: string
      - name: SAT_2_ID
        in: query
        description: NORAD ID of secondary object
        schema:
          type: string
      - name: TCA_RANGE_START
        in: query
        description: Time of closest approach start filter (ISO 8601)
        schema:
          type: string
      - name: TCA_RANGE_END
        in: query
        description: Time of closest approach end filter (ISO 8601)
        schema:
          type: string
      - name: PC
        in: query
        description: Probability of collision filter (e.g., >0.0001)
        schema:
          type: string
      - name: MISS_DISTANCE
        in: query
        description: Miss distance filter (km)
        schema:
          type: string
      - name: orderby
        in: query
        schema:
          type: string
      - name: limit
        in: query
        schema:
          type: integer
      responses:
        '200':
          description: Conjunction data messages
          content:
            application/json:
              schema:
                type: array
                items:
                  $ref: '#/components/schemas/ConjunctionDataMessage'
        '401':
          description: Unauthorized
components:
  schemas:
    ConjunctionDataMessage:
      type: object
      description: Conjunction Data Message indicating potential close approach
      properties:
        CDM_ID:
          type: integer
        CREATED:
          type: string
          format: date-time
        EMERGENCY_REPORTABLE:
          type: string
        TCA:
          type: string
          format: date-time
          description: Time of closest approach
        MIN_RNG:
          type: number
          description: Minimum range (km)
        PC:
          type: number
          description: Probability of collision
        SAT_1_ID:
          type: integer
          description: NORAD ID of primary object
        SAT_1_NAME:
          type: string
        SAT_2_ID:
          type: integer
          description: NORAD ID of secondary object
        SAT_2_NAME:
          type: string
        SAT_1_TYPE:
          type: string
        SAT_2_TYPE:
          type: string
        MISS_DISTANCE:
          type: number
          description: Miss distance (km)
  securitySchemes:
    sessionCookie:
      type: apiKey
      in: cookie
      name: chocolatechip
      description: Session cookie obtained after successful login via POST /ajaxauth/login