Dimorphos

Dimorphos is a natural satellite of the near-Earth asteroid 65803 Didymos, discovered in 2003 by Petr Pravec and colleagues. It is estimated to have a diameter of 177 meters and was the target of the Double Asteroid Redirection Test (DART) mission, which collided a spacecraft with it on September 26, 2022, altering its orbit around Didymos. The DART impact reduced Dimorphos's orbital period by 33 minutes and ejected over a million kilograms of debris into space, producing a dust plume and a long dust tail. The impact is predicted to have caused global resurfacing and deformation of Dimorphos's shape, and it may have either significantly deformed it into an ellipsoidal shape or sent it into a chaotically tumbling rotation. The ESA's Hera mission is planned to arrive at the Didymos system in 2026 to further study the effects of the DART impact on Dimorphos.learn more on wikipedia