Strange transit over Jupiter?

[riklaunim]

Today, 03.07.2010 at about 3:18 GMT +1 (2:18 local summer time) in Poland / Warszawa I was imaging Jupiter. The seeing and results are as usuall... except that I've spotted a shadow on Jupiter where no moon was in the right spot to make a shadow (Io and Calisto on the back of Jupiter). Looking more I think I've spotted something bright and round-like that also moves with the shadow:

I've marked those things on: http://i48.tinypic.com/2czeb9t.jpg
Animation: http://i46.tinypic.com/ncmjye.jpg
Is this is one of small moons, flyby of something or just such "strange" things in Jupiter atmosphere?

And standard images:
f/20:
- image 1 (http://www.rkastrofoto.appspot.com/site_media/astro/orig/jowisz-03-07-2010/f20-irgb-sh1a.png)
- image 2 (http://www.rkastrofoto.appspot.com/site_media/astro/orig/jowisz-03-07-2010/f20-irgb-sh2.png)
- image 3 (http://www.rkastrofoto.appspot.com/site_media/astro/orig/jowisz-03-07-2010/f20-irgb-sh3wvl.png)



f/15:
- image 1 (http://www.rkastrofoto.appspot.com/site_media/astro/orig/jowisz-03-07-2010/f15-irgb1.png)
- image 2 (http://www.rkastrofoto.appspot.com/site_media/astro/orig/jowisz-03-07-2010/f15-irgb2.png)
- image 3 (http://www.rkastrofoto.appspot.com/site_media/astro/orig/jowisz-03-07-2010/f15-irgb3.png)

DMK21/SCT8 and filter threaded focal reducer:
- image (http://www.rkastrofoto.appspot.com/site_media/astro/orig/jowisz-03-07-2010/jup-reduced.png)

[stephenb]

Hi riklaunim, I can only assume it is some sort of surface detail perhaps? Certainly nothing shows using Jupiter 2 (http://astrosurf.com/rondi/programmes/index.htm). There are other forum members here with more knowledge of Joop's surface features, than me, they may be able to explain further.

[riklaunim]

It may be one of small moons. The shadow part is bit to odd for a surface detail and it gets elongated when it gets to the right side of the planet - so it's probably a shadow.