Near-Earth Objects
Track all known asteroids passing near Earth from NASA JPL database.
Hazardous Asteroids
Potentially Hazardous Asteroids (PHA) highlighted with special alerts.
Close Approaches
Calendar of upcoming asteroid flybys with distance and size data.
Discovery Data
New asteroid discoveries and orbit calculations updated daily.
What Are Near-Earth Objects?
Near-Earth Objects (NEOs) are asteroids and comets with orbits that bring them close to Earth. We track:
- Near-Earth Asteroids (NEAs) - Rocky objects passing within 1.3 AU of the Sun
- Potentially Hazardous Asteroids (PHAs) - Objects >140m that approach within 0.05 AU of Earth
- Near-Earth Comets (NECs) - Icy bodies with close Earth approaches
Size Classifications
- Small - Under 25 meters (atmospheric burn-up)
- Medium - 25-140 meters (regional damage potential)
- Large - 140m-1km (country-scale destruction)
- Giant - Over 1km (global catastrophe potential)
NASA's Planetary Defense Coordination Office monitors all known PHAs. Over 2,300 PHAs have been discovered.
Hazard data sources
Events are aggregated from USGS, EMSC, NOAA, NASA EONET, NASA FIRMS and GDACS, then normalized and deduplicated.
Frequently asked questions
Is Earth in danger from asteroids?
No known asteroid poses significant risk in the next 100+ years. NASA monitors all large NEOs and would detect dangerous objects decades in advance.
How close do asteroids get to Earth?
Several asteroids pass closer than the Moon each month. Some pass within tens of thousands of kilometers - close in space terms but safely distant.
What makes an asteroid 'potentially hazardous'?
PHAs are asteroids >140 meters that come within 0.05 AU (7.5 million km) of Earth's orbit. Size + proximity = potential hazard classification.