NASA Asteroid Tracker
Real-time near-Earth asteroid data sourced directly from NASA CNEOS and JPL — updated every hour, with orbital parameters, risk scores, and close approach data.
Current Top Risk Asteroids
Data Sources
NASA CNEOS
Center for Near Earth Object Studies — primary source for close approach data, sizes, and velocities.
cneos.jpl.nasa.gov →NASA NeoWs API
Near Earth Object Web Service — the API we use to fetch daily NEO feeds and orbital parameters.
api.nasa.gov →JPL Small-Body Database
Jet Propulsion Laboratory — source for Keplerian orbital elements and Earth MOID values.
ssd.jpl.nasa.gov →Our Risk Index
Proprietary algorithm combining MOID, diameter, velocity, PHA status and orbit reliability into a 0–100 score.
How it works →How NASA Tracks Asteroids
NASA's Planetary Defense Coordination Office oversees the detection, tracking, and characterization of near-Earth objects. Ground-based telescopes around the world continuously scan the sky, reporting observations to the Minor Planet Center, which maintains the official catalogue of known asteroids.
Once an asteroid is detected, its orbit is computed using the observed positions. The quality of this computation is expressed as a condition code (0 = best, 9 = uncertain). As more observations accumulate over time, the orbit becomes increasingly precise.
The data we use comes from NASA's public APIs, updated daily. We re-fetch and process this data every hour to ensure you always see the latest information.
Full Tracker with 3D Orbits
View interactive 3D orbital visualizations, detailed risk analysis, and NASA-sourced asteroid images.
Open Full Tracker →