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THE ASTRONOMER Electronic Circular No 2566      2009 Jly 20 11.44UT
Ed:Guy M Hurst, 16,Westminster Close, Kempshott Rise,  Basingstoke,
Hants, RG22 4PP,England.Telephone/FAX(01256)471074Int:+441256471074
INTERNET: GUY@TAHQ.DEMON.CO.UK      Backup: gmh@wdcc1.bnsc.rl.ac.uk
WORLD WIDE WEB                         http://www.theastronomer.org
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DARK SPOT ON JUPITER
Dave Tyler has e-mailed us to send an image of a dark spot on Jupiter 
found earlier by Anthony Wesley of Canberra, Australia on an image of 
2009 July 19 and which may indicate some form of impact.

Anthony's image shows a new dark spot in the South Polar Region at 
approximately 216deg longitude in System 2 according to the website for 
'Universe Today'. Although it resembles the dark features seen when 
Comet Shoemaker-Levy 9 impact with Jupiter in 1994, some observers have 
also suggested it may be merely caused by Jovian weather.

Dave Tyler adds that his image taken of 2009 July 20 (02h09mUT) with red 
filters using a 0.15-m aperture telescope shows some residue to the 
right of the main marking and speculates that if an impact the object 
may have entered the atmosphere from the left and boiled up material 
subsurface on the right.

Predicted times for observing the new feature can be found at:

http://www.universetoday.com/2009/07/19/possible-new-impact-on-jupiter/


Further observations would be welcomed and please send to Mark Kidger 
with a copy to the main editor.

Guy M Hurst