Warning. Due to some maintenance activities, some tools and services may not be available.

The May monthly update is still ongoing. Some objects, may be temporarily unavailable.

Warning: we are performing some maintenance activities on our system. Some services, including the ephemeris and APIs, may be unavailable.  

Warning: the Observation Planning Tool is currently under maintenance. It will be accessible as soon as possible.

The portal is under maintenance. Some of its features may not be available. Sorry for the inconvenience.

Attention. The NEOCC Priority List will soon be decommissioned. The data in the table, as well as the response from the corresponding REST API, are still valid for now, but will be turned off in...

The portal is under maintenance, we apologize for the inconvenience.

Our search engine provides a comprehensive exploration of the entire asteroid database, offering a wide range of filtering options based on object group, risk class, orbital parameters,...

Orbit Properties This page contains information about orbital properties of the object, as computed by the Aegis Orbit Determination and Impact Monitoring system. Orbital elements at a refence...

The NEOCC is ESA's centre for observing and computing asteroid orbits and assessing their impact risk.

Albedo The ratio of reflected sunlight to incident sunlight. Given an albedo and the distance of the asteroid from the Sun and the observer, the size of an object can be estimated from its...

Close Approach Fact Sheet for asteroid 2024 YR4 (version 1.0)

Planetary Defence involves a collaborative effort among various organizations, including the European Space Agency (ESA), NASA, the Jet Propulsion Laboratory (JPL), and the Center for Near Earth...

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