The Comet Interceptor is a robotic spacecraft mission led by the European Space Agency (ESA) planned for launch in 2029.

[2] The spacecraft will be "parked" at the Sun-Earth L2 point and wait for up to three years for a long-period comet to fly by at a reachable trajectory and speed.

[1] Long-period comets have highly eccentric orbits and periods ranging from 200 years to millions of years,[3] so they are usually discovered only months before they pass through the inner Solar System and return to the distant reaches of the outer Solar System, which is too little time to plan and launch a mission.

Comet Interceptor will share the launch vehicle with ESA's ARIEL space telescope, which is also bound for Lagrange point 2.

[9][10] Each of the three spacecraft will sample gas composition, dust flux, density, magnetic fields, and plasma and solar wind interactions, to build up a 3D profile of the region around the comet.