This is Jupiter on 24 July 1999 at approximately 0841-0845UT. The small satellite (moon) to the upper right of the limb of Jupiter is Ganymede. As can be seen in this image, Jupiter is crossed with alternating light and dark atmospheric bands parallel to its equator. The dark regions are called belts, while the light regions are zones. Jupiter has the most rapid rotation of any planet in our solar system; the Jovian day is just under 10 hours. However, different latitudes have slightly different rotational velocities and so there are turbulent flows and currents at the boundaries of the cloud bands.
Ganymede, which is visible in the image, is the largest moon or satellite in our solar system. In fact, it's larger than two planets, Mercury and Pluto. This image was taken just shortly before Ganymede was to be occulted by (pass behind) Jupiter at 0857UT.
More information and images of Jupiter are available at Wikipedia - Jupiter. This site also has detailed information about Ganymede.
In order to capture this image I used eyepiece projection and stacked six extremely short (0.001s) exposures. The result was processed with several unsharp masks.
This image from 7 August 1999 at 0714UT includes Jupiter's moon Europa to the upper left. Note the change in appearance of the mid-latitude belts from 24 July to 7 August.
The above color image of Jupiter is from 2 October 1999 at 0228UT. It was combined from individual 0.1 sec exposures through a cyan, magenta and yellow filter.
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