Dimorphos

(65803) Didymos I Dimorphos (provisional designation S/2003 (65803) 1) is a minor-planet moon of the near-Earth asteroid 65803 Didymos. It has a diameter of 170 metres (560 feet). It has been called a low-density rubble pile. It was discovered in 2003 at the Ondřejov Observatory.

the asteroid 65803 Didymos with it's moon called Dimorphos

Dimorphos was the target of the Double Asteroid Redirection Test (DART), a NASA space mission that crashed with Dimorphos in September 2022 on purpose.^[1][2] The European Space Agency mission Hera is planned to arrive at the Didymos system in 2026. It will study the effects of the collision on the moon.