# Dimorphos
Who / What
Dimorphos is a natural satellite or moon orbiting the near-Earth asteroid Didymos. It belongs to a binary asteroid system, forming a pair with Didymos itself. As of current astronomical knowledge, it is classified as a small celestial body, primarily notable for its role in space missions aimed at planetary defense.
Background & History
Dimorphos was discovered on **20 November 2003** by Petr Pravec and collaborators from around the world using ground-based telescopes. Initially designated as S/2003 (65803) 1, it gained formal designation Didymos I upon its recognition within the binary system of asteroid 65803 Didymos. The discovery marked a significant milestone in understanding binary asteroids and their dynamics.
Why Notable
Dimorphos holds particular importance due to its role in NASA’s **DART (Double Asteroid Redirection Test)** mission, which intentionally impacted the moon in September 2022 to test planetary defense strategies. Its small size (~177 meters) and proximity to Earth make it a critical target for studying asteroid deflection techniques. Additionally, Dimorphos provides insights into the formation and evolution of binary systems.
In the News
As part of NASA’s DART mission, Dimorphos has garnered global attention due to its pivotal role in testing how humanity might deflect an incoming asteroid threat. The mission’s successful impact altered Dimorphos’ orbit around Didymos, offering real-world data on planetary defense strategies and sparking discussions about future space missions aimed at protecting Earth.
