Asteroid
Ida
TypeAsteroid
Mass~4 × 10¹⁶ kg
Diameter31 km
Orbital Radius428 million km
Orbital Period1,768 days
Rotation Period4.63 hours
Known Moons1
Surface Gravity~0.01 m/s²
Average Temp-100 °C
AtmosphereNone
Discovered ByJohann Palisa
Discovery Year1884
About Ida
The first asteroid known to possess a moon. Galileo spotted 1.4 km Dactyl orbiting it in 1993. A member of the Koronis collision family, heavily cratered and elongated.
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