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Jupiter 2012 11 01

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#26 Asbytec

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Posted 02 November 2012 - 12:35 PM

Ah! Okay. I retired in the far east at 16 degrees north.

The template is a great tip. You can make one by importing an appropriate image of Jupiter into Powerpoint then laying an ellipse on the limb. You can even put some guides as to the belts and zones.

One thing I am trying to do is to sketch Jupiter's preceding limb, first. Since Jupiter rotates faster than I can sketch, it helps to get those details locked down while placing any details toward following edge. It might be cheating, but as the following details rotate into a better view on the meridian, you can tune them up while your preceding limb detail disappears.

#27 Chopin

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Posted 02 November 2012 - 12:45 PM

One thing I am trying to do is to sketch Jupiter's preceding limb, first. Since Jupiter rotates faster than I can sketch, it helps to get those details locked down while placing any details toward following edge. It might be cheating, but as the following details rotate into a better view on the meridian, you can tune them up while your preceding limb detail disappears.


Good tip! I'll steal...I mean use your idea. ;)

#28 Special Ed

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Posted 03 November 2012 - 08:15 AM

Hi Jason,

Good to see one of your sketches again. :) Given the seeing, you made a very careful and accurate observation. Noticing the slight shadowing on the preceding limb, for instance. That's a phenomenon observable before opposition (about a month from now). It becomes less pronounced as the planet nears opposition and then shifts to the following limb after opposition.

You captured the main features nicely so if you just keep practicing (and get better seeing conditions) you'll be rapidly satisfied with the results.

You've already picked up on using a more oval template. I think noting at least the CM II longitude is useful to place features in the Jovian cloudtops and compare your sketch to other sketches and images.

Because of Jupiter's differential rotation and super turbulent atmosphere, features in the cloudtops move all over the place. For instance, Oval BA has moved over 10° in longitude since my Sept. 30th observation.

System I is 10° north and south of the equator. It rotates slightly faster (~5 mins per rotation) than System II, which is the area from 10° to the poles. System III pertains to radio astronomy so we visual observers can safely igmore it.

Good luck with your next observation. :)

#29 Chopin

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Posted 04 November 2012 - 09:02 PM

Mike, thanks for the kind words and very useful tips! It's good to get out observing again, and good to "hear" from you, as well.






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