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Mass resonance between Jupiter's four large moons Io, Europa, Ganymede and Callisto



 
 
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Old February 18th 06, 04:17 PM posted to sci.astro,sci.physics
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Default Mass resonance between Jupiter's four large moons Io, Europa, Ganymede and Callisto

"In 1610 when Galileo first pointed a telescope at the sky he
discovered
Jupiter's four large moons
Io, Europa, Ganymede and Callisto (now known as the Galilean moons)"

Mass_Io=8.93e22
Mass_Europa=4.80e22
Mass_Ganymede=1.48e23
Mass_Callisto=1.08e23

http://www.nineplanets.org/data1.html

Mass_Europa+Mass_Ganymede=1.9600e+023

Mass_Io+Mass_Callisto = 1.9730e+023

(Mass_Io+Mass_Callisto)/(Mass_Europa+Mass_Ganymede) = 1.0066


"Io, Europa and Ganymede are locked together in a 1:2:4 orbital
resonance (Laplace resonance) and their orbits evolve together.
Callisto is almost part of this as well. In a few hundred million
years, Callisto will be locked in too, orbiting at exactly twice the
period of Ganymede (eight times the period of Io). "
http://www.nineplanets.org/jupiter.html

( Io + Callisto ) and ( Europa + Ganymede ) are locked together in
a 1:1 Mass resonance named after Aleksandr Timofeev

================================================== =======
( Mass_Io + Mass_Callisto ) / ( Mass_Europa + Mass_Ganymede ) = 1.0066
================================================== =======

Mass_Io - mass of Io
Mass_Callisto - mass of Callisto
Mass_Europa - mass of Europa
Mass_Ganymede - mass of Ganymede

 




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