Jupiter
Jupiter imaged by Damian Peach

This is a still a great month to observe Jupiter which came into opposition on May 8th and will be visible in the south in the late evening   It is moving down the ecliptic and now lies in Libra so, sadly, will only reach an elevations of ~20 degrees when crossing the meridian.   An interesting observation is that the Great Red Spot appears to be diminishing in size.   At the beginning of the last century it spanned 40,000 km across but now appears to be only ~16,500 km across - less than half the size.   It used to be said that 3 Earths could fit within it, but now it is only one.   The shrinking rate appears to be accelerating and observations indicate that it is now reducing in size by ~580 miles per year.   Will it eventually disappear?

[I have imaged Jupiter recently and the Red Spot is very prominent and has a lovely orange/red colour.   These can be seen in my article 'Imaging Jupiter at Closest Approach' to be found in my Astronomy Digest ]  

 

The features seen in the Jovian atmosphere have been changing quite significantly over the last few years - for a while the South Equatorial Belt vanished completely (as seen in Damian's image) but has now returned to its normal wide state but is less prominent than the North Equatorial Belt.   The diagram on right shows the main Jovian features as imaged by the author at the beginning of December 2012. (When Jupiter was at a high elevation allowing a greater resolution image than now.)

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