Dimorphos

Quick Facts: Who was Dimorphos?

Subject:

Dimorphos

Known for:

Natural satellite of asteroid Didymos, famous for the DART impact test.

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2Day Chrono-Wiki & Primary Historical Archives

Origins & Early Life

Dimorphos (formal designation (65803) Didymos I; provisional designation S/2003 (65803) 1) is a natural satellite or moon of the near-Earth asteroid 65803 Didymos, with which it forms a binary system. The moon was discovered on 20 November 2003 by Petr Pravec in collaboration with other astronomers worldwide. Dimorphos has a diameter of 177 meters (581 ft) across its longest extent.

Career & Major Achievements

Dimorphos is the second smallest asteroid photographed and visited by a spacecraft, after Kamoʻoalewa. It was the target of the Double Asteroid Redirection Test (DART), a NASA space mission that deliberately collided a spacecraft with the moon on 26 September 2022 to alter its orbit around Didymos.

Enduring Legacy & Impact

Before the impact by DART, Dimorphos had a shape of an oblate spheroid with a surface covered in boulders but virtually no craters. The moon is thought to have formed when Didymos shed its mass due to its rapid rotation, which formed an orbiting ring of debris that conglomerated into a low-density rubble pile that became Dimorphos today.

Chronological Milestones & Life Events

1. 2003: 2003 Milestone — Dimorphos (formal designation (65803) Didymos I; provisional designation S/2003 (65803) 1) is a natural satellite or moon of the near-Earth asteroid 65803 Didymos, with which it forms a binary system.
2. 2022: 2022 Milestone — It was the target of the Double Asteroid Redirection Test (DART), a NASA space mission that deliberately collided a spacecraft with the moon on 26 September 2022 to alter its orbit around Didymos.

Notable Quotes by Dimorphos

“The DART impact reduced Dimorphos's orbital period around Didymos by 33 minutes.” (2022)

Historical Fact-Check Quiz: Dimorphos

True or False: “The DART impact was intended to prove that asteroid orbits are completely immutable and cannot be altered by external forces.”

Answer (FALSE ❌): The DART impact was specifically designed to demonstrate that asteroid orbits *can* be altered by external forces, successfully reducing Dimorphos's orbital period.

Contemporary Figures & Related Historical Timelines

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• Alexander Vovin — Historical peer (Died in 2022) (2022): Pioneering Russian-American linguist specializing in East Asian languages, particularly Japanese.

Frequently Asked Questions about Dimorphos