Abstract
The motion of the four Galilean moons of Jupiter is studied in this work. The moons hadtheir positions with respect to the centre of the planet measured during one week ofobservation by means of telescopic charge coupled device images. It is shown that theirmovement can be well described as a simple harmonic motion. The revolution period andthe orbital radius of each moon could be extracted from the various images and they wereanalysed in terms of Kepler’s third law and Newton’s law of universal gravitation. Themass of Jupiter could be evaluated within a 2% discrepancy using this simple method.
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