Asteroid Terrestrial-impact Last Alert System   

ATLAS is an asteroid impact early warning system developed by the University of Hawaii and funded by NASA. It consists of four telescopes (Hawaii ×2, Chile, South Africa), which automatically scan the whole sky several times every night looking for moving objects.  

ATLAS will provide a warning time depending on the size of the asteroid -- larger asteroids can be detected further from Earth. ATLAS will see a small (~20 meter) asteroid several days out, and a 100 meter asteroid several weeks out. A 100 meter asteroid has approximately 10 times the destructive force of the 2021 Tonga volcanic eruption.

ATLAS Discovery Totals
Near-Earth Asteroids
Potentially Hazardous Asteroids


ATLAS 2 on Maunaloa

ATLAS promptly submits observations of new Near Earth Asteroids to the Minor Planet Center, where they appear on the NEO confirmation page. Astronomers all across the world check this webpage every night and collect further measurements needed to calculate the asteroids' orbits and determine if they could threaten Earth.

Meanwhile, the Scout Hazard Assessment webpage maintained by NASA-JPL's Center for Near Earth Object Studies interprets the observations using sophisticated computer programs, checking for immediate threats and requesting further measurements of asteroids whose orbits remain uncertain. Both websites are publicly accessible to anyone in the world.

ATLAS also processes the survey data to search for stationary transients, which are reported to the IAU Transient Name Server. These include supernovae, CVs, stellar outbursts, and fast transients such as GRB afterglows.  We also have an agreement with LIGO to search for electromagnetic counterparts to gravitational wave sources. Our colleagues in Queen’s University Belfast, Harvard, and the Space Telescope Science Institute help run these programmes. We are in the top 3 reporting groups worldwide, with more than 300 supernovae candidates found during 2016.  A full list of ATLAS transient discoveries can be accessed here

Project Status

System Design

Asteroid Threat

Other Science