Galilean Satellite Fact Sheet

Information on the Jupiter's satellites Callisto, Ganymede, Europa, and Io and comparison with other solar system bodies.

  CALLISTO GANYMEDE  EUROPA     IO       MOON   MERCURY   PLUTO   TITAN   TRITON   CERES   EARTH 
Diameter (km) 4821 5262 3122 3643   3475 4879 2390 5150 2705 950 12,756
Mass (1021kg) 107.6 148.2 48.0 89.3   73.5 330.2 12.5 134.6 21.5 0.87 5970
Density (kg/m3) 1830 1940 3010 3530   3340 5427 1750 1881 2050 2000 5515
Gravity (m/s2) 1.24 1.43 1.31 1.80   1.6 3.7 0.6 1.35 0.78 0.26 9.8
Escape Velocity (km/s) 2.4 2.7 2.0 2.6   2.4 4.3 1.1 2.6 1.5 0.5 11.2
Rotation Period (hours) 400.5 171.7 85.2 42.5   655.7 1407.6 -153.3 382.7 -141.0 9.1 23.9
Orbital Distance (103 km) 1883 1070 671 422   384 57,900 5,870,000 1222 355 414,000 149,600
Periapse (103 km) 1870 1068 664 420   363 46,000 4,435,000 1186 355 381,000 147,100
Apoapse (103 km) 1896 1072 678 424   406 69,800 7,304,300 1258 355 447,000 152,100
Orbital Period (days) 16.7 7.2 3.6 1.8   27.3 88.0 90,588 15.9 5.9 1680 365.2
Orbital Velocity (km/s) 8.2 10.9 13.7 17.3   1.0 47.9 4.7 5.6 4.4 17.9 29.8
Orbital Inclination (degrees) 0.51 0.21 0.47 0.04   5.1 7.0 17.2 0.33 157.3 10.6 0.0
Orbital Eccentricity 0.007 0.0015 0.0101 0.004   0.055 0.205 0.244 0.029 0.000 0.079 0.017
Mean Temperature (C) -155 -160 -170 -155   -20 167 -225 -180 -215 -105 15
Global Magnetic Field? No Yes No Possible   No Yes Unknown Unknown Unknown Unknown Yes
  CALLISTO GANYMEDE  EUROPA     IO       MOON   MERCURY   PLUTO   TITAN   TRITON   CERES   EARTH 

Text Version of the Fact Table
Jovian Satellite Fact Sheet
Index of Planetary Fact Sheets - More detailed fact sheets for each planet
Notes on the Fact Sheets - Explanations of the values and headings in the fact sheet

[NASA Logo]
Author/Curator:
Dr. David R. Williams, dave.williams@nasa.gov
NSSDC, Mail Code 690.1
NASA Goddard Space Flight Center
Greenbelt, MD 20771
+1-301-286-1258

NASA Official: Ed Grayzeck, edwin.j.grayzeck@nasa.gov
Last Updated: 01 September 2004, DRW