Dactyl

Also known as Ida I, S/1993 (243) 1, (243) Ida I

moon of asteroid 243 Ida

Key facts

Discovered by: Ann Harch
Discovery site: Galileo spacecraft
Discovery date: 17 February 1994
Pronunciation: / ˈ d æ k t ɪ l / DAK -til
Named after: Dactyls
Alternative designations: 1993 (243) 1
Adjectives: Dactylian / d æ k ˈ t ɪ l i ə n /
Semi major axis: 90 km at time of discovery
Orbital period sidereal: prograde, ca. 20 h
Inclination: ca. 8°
Satellite of: Ida
Dimensions: 1.6 km × 1.4 km × 1.2 km
Equatorial escape velocity: 0.895 m/s
Synodic rotation period: synchronous
Temperature: 200 K (−73 °C; −100 °F)

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Wikidata facts

Image: Dactyl1.jpg

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time of discovery or invention: 1994-02-17
provisional designation: S/1993 (243) 1
semi-major axis of an orbit: 108
Commons category: Dactyl (moon)

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Article

Dactyl (/ˈdæktɪl/ DAK-til), formal designation (243) Ida I, is a small asteroid moon 1,200 by 1,400 by 1,600 m (3,900 by 4,600 by 5,200 ft), in size) that orbits 243 Ida, a main-belt asteroid. It was imaged by the Galileo spacecraft on August 28, 1993; Dactyl was discovered while examining the delayed image downloads from Galileo on February 17, 1994. It was provisionally designated S/1993 (243) 1. The satellite was named after the mythical creatures called dactyls, who, according to Greek mythology, lived on Mount Ida.

Orbit