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Jupiter and 3 spots.

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#1 Jef De Wit

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Posted 18 September 2010 - 06:48 AM

Yesterday I observed Io passing before Jupiter. The planet was low in the sky, so no much detail to see. The shadow of Io was easy to see. The GRS was sometimes visible as an oval with a ochre color. The color difference with the rest of Jupiter was striking! I only managed to see Io when he was almost at the limb.

Could any colorfilter make a moon more visible when passing Jupiter?

17/09/2010, 21.50 UT, 12" dobson @ x171 + apodizing mask, alt. 31°, CM1=172° CM2=177°

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#2 CarlosEH

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Posted 18 September 2010 - 09:30 AM

Jef,

A beautiful and well rendered observation of Jupiter. You have recorded the shadow of Io (I) very nicely. The Great Red Spot (GRS), South Temperate Belt (STB), North Equatorial Belt (NEB), and North Temperate Belt show interesting detail. Thank you for sharing it with us all.

A yellow (Wratten 8/12), orange (W21), or red (W23A/25) filter will sharpen the view and therefore "darken" the shadow of the satellite. Blue (W38, not W80A as much) and violet (W47) may blur the shadow a little. Experimentation is the best way to answer this one.

I look forward to your future observations.

Carlos

#3 dweller25

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Posted 18 September 2010 - 10:05 AM

Great drawing Jef, nice colours too.

#4 Jef De Wit

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Posted 18 September 2010 - 10:49 AM

Carlos and Dweller, thanks a lot!
On the original drawing the color of the GRS was OK, but the belts were to light. On the scan, the belts turned out to be OK, but now the GRS is to dark (it must be more "yellow").

#5 mathteacher

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Posted 18 September 2010 - 12:03 PM

Yup, nice colors and observing. Thank you!

#6 CarlosEH

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Posted 18 September 2010 - 01:01 PM

Jef,

If you would permit me to do so. I can provide an image with the color adjusted.

Carlos

#7 Special Ed

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Posted 18 September 2010 - 02:25 PM

Nice sketch and nice colors, Jef. :) I happened to catch Jupiter with 3 spots too, a day after your observation. This time it was the GRS, Ganymede, and its shadow. Ganymede was visible in front of the Jovian disk--it and Callisto often are relatively easy to spot. Io and Europa are much harder to see except when they are just inside the limb.

I could have called 4 spots, but the Oval BA was too faint. I was able to see the hollow in which it resides. :cool:

I saw a lot of color (for me) but just made a graphite drawing--2B pencil. My report is posted here in the Solar System Observing forum.

Here is an image of Jupiter made not long after my sketch. :)

#8 frank5817

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Posted 18 September 2010 - 09:39 PM

Jef,

Excellent sketching of a low Jupiter. Jupiter is always a fine target especially near opposition.

Frank :)

#9 JimPie

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Posted 19 September 2010 - 12:34 AM

Jef,
Nice detail and color in this transit sketch.

#10 norden

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Posted 19 September 2010 - 01:19 AM

Very nice sketch! Excellent sketching of Jupiter with nice details!

Mikael

#11 Jef De Wit

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Posted 19 September 2010 - 07:45 AM

Everybody, thanks for the nice words. I find it surprising that most like the color. For me the EZ looks beige, but I find it very difficult to reproduce this color on a drawing. In my 30 colorpensil set there's no color that can do the job. So I used a brown pastel pencil for most of Jupiter. Only the belts and the GRS are done with normal color pencils.

@ Carlos: Ofcourse you can give it a try! You are so more gifted with software than me. I'm already happy when I can put a black mask around Jupiter :grin: I will wait with impatience to see the result...

#12 lunar

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Posted 19 September 2010 - 02:23 PM

Great Sketch!

#13 Uwe Pilz

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Posted 20 September 2010 - 01:23 AM

Excellent and very detailed sketch! Thank you!

#14 Jef De Wit

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Posted 20 September 2010 - 09:07 AM

Brandon and Uwe :thanx:

#15 Sarkikos

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Posted 20 September 2010 - 10:04 AM

Jef,

Great sketch. I'm happy the apodizing mask is working for you. I always have mine in when observing Jupiter. I haven't tried color in my sketches yet, but maybe for the next one.

Clear & Steady Skies,
Mike

#16 Jef De Wit

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Posted 21 September 2010 - 07:56 AM

Mike, thanks for the kind words. You should try a color sketch. Your black/white sketches of Jupiter are really good, so a color version shouldn't be the problem. Can't wait to see the result.

#17 CarlosEH

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Posted 21 September 2010 - 06:19 PM

Jef,

Sorry it took me a little while to get back. I have provided a mild correction of the color of the Great Red Spot (GRS) below. Please let me know if you like it.

I look forward to your future observations.

Carlos

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#18 Jef De Wit

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Posted 22 September 2010 - 10:48 AM

Carlos, thanks for processing my sketch. Your coloring of the GRS is more the way I saw it at the EP.






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