JPL SSD/CNEOS API Service

Welcome to JPL’s SSD (Solar System Dynamics) and CNEOS (Center for Near-Earth Object Studies) API (Application Program Interface) service. This service provides an interface to machine-readable data (JSON-format) related to SSD and CNEOS.

Important Notes

Each API is limited to one request at a time: concurrent/simultaneous requests will be rejected.
Data formats can change without notice. You should always check the version field in the API output to detect any change (in which case, you should come back to this site to see what, if anything, in the data format/output changed).
There is no guarantee any particular API will be available indefinitely.
This service is made available on a best effort basis.
If you encounter unexpected errors, please let us know.

If you are looking for human-readable data, please go to the main websites for SSD and/or CNEOS.

APIs Available

The following APIs are available. A solid understanding of JSON is necessary to make use of these APIs.

API	Description
Fireball	Fireball atmospheric impact data reported by US Government sensors
Horizons	Horizons system programattic (query-parameter-based) interface
Horizons File	Horizons system programattic (file-based) interface
Horizons Lookup	Horizons lookup service
JD Date/Time Converter	Julian Day number to/from calendar date/time converter
NHATS	Human-accessible NEOs data
Periodic Orbits	Interactive interface to database of periodic orbits
SB Close Approach	Asteroid and comet close approaches to the planets in the past and future
SB Identification	Small-body identification within a specified FOV at a specific time
SB Mission Design	Small-body mission design tool
SB Observability	Provides a list of small-bodies observable on a specific date
SB Radar	Small-body radar astrometry data
SB Satellites	Small-body satellite data
SBDB	Small-Body DataBase (SBDB) - primarily orbital data on all known asteroids and comets
SBDB Query	Small-Body DataBase (SBDB) query tool
Scout	NEOCP orbits, ephemerides, and impact risk data
Sentry	NEO Earth impact risk assessment data

REST Compliance

Every attempt has been made to ensure our APIs follow the REST architecture style. Although URI path mapping is often associated with REST APIs, they are not a requirement of REST. Because these APIs only get data from a database (no updates or deletes), query parameters are specified instead of using URI path mapping. Similarly, only GET and POST HTTP-request types are supported.

NASA API Service

For additional NASA APIs, visit the webpage at https://api.nasa.gov/.