Monday, October 12, 2009


I sketched the above 'time lapse' images with around 1 hour difference on October 4th, 2009. Most interesting is the North Equatorial Belt showing contrasting areas that change from one time step to another. The change in position of the great red spot (GRS) in a time span of one hour shown in the last two images indicates the rapid rotation of the gaseous clouds at the latitude of the south temporal belt.

8" to 10" reflecting telescopes show interesting complex surface patterns that are indicative of the rapid rotation of planet Jupiter. These band features correspond to gaseous clouds in its atmosphere. The rotational period is around 10 hours, but this varies with latitude.

The rotation period at the latitude of the south temporal belt can be gauged with the rate of movement of the great red spot or large white ovals in the south temperate belt. These large white ovals are shown in the sketch made on 10th October, partly shown below and circled in red.


  1. Beautiful sketch!
    You should post these sketches on (astronomy sketch of the day).

  2. Alex
    Thanks for your suggestion. Yor proposed site is very interesting.