Dimorphos is a small asteroid satellite that was discovered in 2003. It is the minor-planet moon of a synchronous binary system with 65803 Didymos as the primary asteroid. After being provisionally designated as S/2003 1 with informal nicknames such as "Didymos B" and "Didymoon", the Working Group Small Body Nomenclature of the International Astronomical Union gave the satellite its official name on 23 June 2020. At a diameter of 170 metres, it is one of the smallest astronomical objects that has been given a permanent name. Dimorphos is the target of NASA's Double Asteroid Redirection Test, a mission spacecraft which was launched on 24 November 2021 with a planned impact between 26 September and 1 October 2022. The DART mission is a test of planetary defence against asteroids. A flyby mini-satellite named LICIACube, provided by the Italian Space Agency, will photograph the collision. The European Space Agency's Hera mission will observe the asteroid after the impact.

Read more in the app

Asteroid-smash aftermath: Why Europe is sending a probe to DART-battered Dimorphos

Watch a Nicely Stabilized Video of DART Flying Past Didymos and Slamming Into Dimorphos

NASA's DART asteroid impact won't make Dimorphos hit Earth — but here's what would happen if it did

Astronomers stunned as binary asteroid Didymos-Dimorphos brightens after DART space rock impact

NASA’s DART Spacecraft Successfully Impacts Asteroid Moonlet Dimorphos

NASA's DART mission successfully smashed into asteroid Dimorphos

When will we know how much DART changed the orbit of asteroid Dimorphos?

DART Impact Day: How To Watch Live Coverage of Spacecraft’s Impact With Asteroid Dimorphos

DART asteroid crash: What time will NASA probe hit Dimorphos on Sept. 26?

NASA’s DART Confirmed on Target To Impact Asteroid Dimorphos

Nasa Dart asteroid spacecraft: Mission to smash into Dimorphos space rock launches