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JupiterSystemPlotEclipse Predicting

5.9 The JupiterMoonChart Function

JupiterMoonChart produces a plot, for a specified period of time, of the positions of the four Galilean moons orbiting Jupiter.

Charting Jovian moon positions.

In the graphic that is returned, the four Galilean moons Io, Europa, Ganymede, and Callisto are colored black, red, green, and blue respectively. Jupiter is colored purple, with the width of the line corresponding to one Jovian diameter. The white line above the purple Jovian disk indicates when the Great Red Spot is visible. It is visible for half of its roughly 10-hour rotation period. (You can adjust the position of the spot by setting $JupiterGreatRedSpotLongitude.)

The horizontal scale is in Jovian radii, and the vertical axis shows time marked off in 6-hour intervals of local time, along with the day of the month.

A JupiterMoonChart graphic displays a Jupiter moon finder chart beginning 1993 November 17 and ending four days later. Local night is shaded with gray bands.

Callisto, in blue and on the right in the graphic, starts off at about 15 Jovian radii west of Jupiter. Over the next couple of nights it moves further away to more than 26 Jovian radii before moving across to the eastern side of Jupiter.

Similary, Io, in black, is first hidden behind Jupiter and then moves to the east; by about 22:00 local time on November 17 it crosses back in front of Jupiter.


Use the option Text->False to prevent the date being printed at the bottom of the chart.

JupiterSystemPlotEclipse Predicting