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 and has been called a low-density rubble pile. It was discovered in 2003 at the Ondřejov Observatory. 
Dimorphos was the target of the Double Asteroid Redirection Test (DART), a NASA space mission that crashed with the moon in September 2022 on purpose. The ESA mission "Hera" is planned to arrive at the Didymos system in 2026 to further study the effects of the collision on the moon.