Galilean moons + Includes
| Io |
Albedo
0.63
Apoapsis
423,529 km (0.00283 AU, 263,168.72 mi)
Color
#CCDD11
Composition
silicate rock and iron
Creation magnetic moment
2.1e+22 N-m/T
Date of discovery
7 January 1610
Escape speed
2.558 km/s (9,208.98 km/h, 1.589 mi/s, 5,722.195 mph)
Inclination
6.98132e-4 rad (0.04 °, 0.0444 grad)
Lunar mass
8.93194e+22 kg (1.216 M☾, 0.0149 M⊕)
Lunar surface area
41,698,065 km² (16,099,712.904 mi², 1.1 A☾, 0.0817 A⊕)
Magnetic decay time
1,098.14 a (401,095.635 da)
Magnetic half life
761.17 a (278,017.343 da)
Mean radius
1,821.6 km (1,131.89 mi)
Mean temperature
130 K (-143.15 °C, -225.67 °F, 234 °R)
Orbital eccentricity
0.0041
Orbital speed
17.34 km/s (62,424 km/h, 10.775 mi/s, 38,788.475 mph)
Order
5
Periapsis
420,071 km (0.00281 AU, 261,020.018 mi)
Planet density
3,528 kg/m³ (3.528 g/ml, 220.246 lb/ft³)
Present magnetic moment
7.86e+19 N-m/T
Rotation speed
0.0749 km/s (269.568 km/h, 0.0465 mi/s, 167.502 mph)
Semi-major axis
421,800 km (0.00282 AU, 262,094.369 mi)
Sidereal day
42.456 h (1.769 da)
Sidereal period
1.769 da (0.00484 a)
Surface gravity
1.796 m/s² (5.893 ft/s², 0.183 g)
Surface magnetic flux density
1.3e-6 T
Discoverer
Simon Marius +, Galileo Galilei +
Member of
Galilean moons +, Moon +
Primary
Jupiter +
Categories Astronomy +, Jupiter +, Moon +, Solar system +
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