SIZE COMPARISON
Io is 3.5x smaller than Earth
DATE OF DISCOVERY
Date object was discovered
AVERAGE ORBIT DISTANCE
Average of minimum and maximum distances from an object to the body it orbits.
149,598,262km
92,956,050miles
1.4959826 x 108km
MEAN ORBIT VELOCITY
The average speed of an object over an entire orbit.
107,218km/h
66,622mph
2.9783 x 104m/s
ORBIT ECCENTRICITY
The amount an object's orbit deviates from a perfect circle.
EQUATORIAL INCLINATION
The tilt of an objects equator in relation to the plane of the ecliptic.
EQUATORIAL RADIUS
The distance from the center of an object to its equator.
6,371.00km
3,958.8miles
6.3710 x 103km
EQUATORIAL CIRCUMFERENCE
The distance around an object at the equator.
40,030.2km
24,873.6miles
4.00302 x 104km
VOLUME
The amount of space an object occupies.
25,319,064,907km3
miles3
km3
1,083,206,916,846km3
259,875,159,532miles3
1.08321 x 1012km3
MASS
89,319,379,731,108,900,000,000kg
lbs
8.9319 x 1022kg
5,972,190,000,000,000,000,000,000kg
lbs
5.9722 x 1024kg
SURFACE AREA
The outer or uppermost part of a planet, moon, asteroid, comet or other body.
41,698,064.74km2
square miles
km2
510,064,472km2
196,936,994square miles
5.1006 x 108km2
SURFACE GRAVITY
The gravitational acceleration experienced at its surface at the equator.
9.80665m/s2
32.041ft/s2
m/s2
ESCAPE VELOCITY
The speed needed for an object to break away from the gravitational pull of a planet or moon.
40,284km/h
25,031mph
1.119 x 104m/s
ATMOSPHERIC CONSTITUENTS
The major gases surrounding a planet in layers.
Sulfur dioxide
Sulfur dioxide
Nitrogen, Oxygen
Nitrogen, Oxygen
N2, O2
Page Updated: May 16, 2024
