Io
Io is one of the four Galilean moons of Jupiter. It is the third-largest Galilean moon and the fourth-largest moon in the Solar System.
Facts About Io:
- Io is the fifth Moon from Jupiter and the innermost Galilean moon.
- It is the most geologically active object in the Solar System (over 400 active volcanoes).
- Volcanoes produce plumes of sulfur and sulfur dioxide that climb as high as 500 km above the surface. The sulfur is what gives Io its yellow colour.
Classification: Moon (orbiting Jupiter)
Names: Io, Jupiter I
Discovered: 1610 by Galileo Galilei
Naming: Named after the Greek mythological priestess of Hera who became one of the lovers of Zeus.
Magnitude: 5.0200 (app)
Mass: 8.931938e+22 kg
Orbit Radius: 421,700 km
Orbital Period: 1.769 Earth days (42.459 hours)
Orbital Speed: 17.3340 km/s
Eccentricity: 0.00410000
Albedo: 0.6300
Volume: 25300000000 km3
Density: 3.5280 g/cm3
Surface Area: 41910000 km2
Surface Gravity: 0.1830 g
Escape Velocity: 2.5580 km/s
Adjective: Ionian