JPL / CNEOS Close-Approach Data
NASA JPL's Center for Near-Earth Object Studies computes close-approach tables and impact-risk (Sentry) summaries for asteroids and comets, served through the Solar System Dynamics APIs. CONNECTED: close approaches, the Sentry table and recent database entries are fetched live and shown at /neo.
Provider status
- Status
- connected
- Data shown
- none on this page — see /space-weather
- Endpoint
- ssd-api.jpl.nasa.gov/
- Licence
- Public NASA/JPL data (SSD/CNEOS APIs).
- Fetched at
- —
- Stale
- no
This is JPL / CNEOS Close-Approach Data's catalogue entry: what it is, what it serves, and under what terms. It carries no measurement — the live readings from this provider are fetched at request time and shown at /space-weather, each with the provider's own timestamp.
What it provides
- Near-Earth object close-approach tables
- Impact-risk (Sentry) summaries
- Small-body ephemerides
Limitations
Connected end-to-end since 2026-08-29. Close-approach times are TDB, not UTC, and are labelled as such rather than converted. Every approach distance is a prediction from a fitted orbit and travels with the provider's 3-sigma bounds. Impact probabilities are JPL's own, with JPL's statement that they can be inaccurate by a factor of a few and occasionally by ten or more; AsteriaStar computes none of its own. JPL's Fair Use Policy permits only one request at a time, which the runtime enforces.
Organisation & phenomena
Knowledge connections
- Associated withIAU Minor Planet Center
- Associated withCNEOS
- Associated withIAU Minor Planet Center
Sources
The primary and reference sources this topic draws on.
- NASA JPLJet Propulsion Laboratory / Solar System Dynamics
Orbital data, ephemerides, and small-body parameters for planets, asteroids, and comets.