I just knew there was more to see than my first sketch. This morning I had no clouds interrupting the observation, just blue sky. I'm getting faster in finding Jupiter in daylight. It took me only 15 minutes this time.
The first thing that strikes the eye is offcourse the NEB. You feel the borders are not straight lines, but impossible to say exactly where he makes some bumps.
The region north of the NEB and the EZ were even, no differences in brightness to see.
The south region is less dark than the NEB and gave a mottled appearance (but again impossible to see detail).
The SPR was brighter than the "south region", but less bright than the NPR. I find it strange, because photo's of Jupiter do not confirm this.
After some effort I could see a thin line (I think I sketched it too much south). I guess it is the northeren border of the SEB. Could anybody confirm this?
The StrZ and SEB were as white as the EZ. So the SEB is stilling "missing".
I had the positions of the Moons with me, but couldn't see them.
Some conclusions after two daylight-sessions:
1) It is rather difficult to find the planet.
2) You will never see more than at night.
3) An apodizing mask makes the planet less bright (this a problem at daylight), but improves the contrast. Frank also suggests that a single polarizing filter (or Polaroid sunglases) should help, but I didn't try it.
4) It is great fun to do. My neighbour asked what the F**** I was looking at
5) Focus on the Moon (when visible) or don't touch your focus after a night observing. I measured the distance of the focuser of my low power EP.
Jupiter, Hove (Belgium), 23/05/2010, 7.00-7.30 UT, 12" dobson @ x171, diam 36.7", alt 37°, mag -2.2