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Jupiter ,the GRS and Io's Shadow

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#1 frank5817

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Posted 19 August 2009 - 11:54 PM

On this pleasant summer night I was treated to a pleasing view of Jupiter and the Great Red Spot with the shadow of Io crossing the equatorial zone. Io itself was also crossing Jupiter but I was not able to pick it out under the existing seeing conditions.


Sketching:

8/19/2009, 3:15 - 4:00 UT

Telescope 10" f/5.7: 6mm ortho. (241 x)
Sketch made on 9"x 12" sketching paper with 2B, 4B and HB graphite pencils, plastic and gum erasers, blending stumps. Contrast increased +2 and brightness decreased -2 using the scanner
Seeing 6/10
Transparency 3/5
Mostly clear, 20°C (68°F)

Frank McCabe :)

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#2 Kris.

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Posted 20 August 2009 - 02:55 AM

excellent sketch Frank! you're not only good at moonsketching ;) great detail in the belts!

i haven't seen a sattelite either during a shadow transit.

#3 JimPie

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Posted 20 August 2009 - 03:58 AM

Frank
Its a great sketch, lots of detail.
And like Kris said I havent seen a moon during a transit either.
Jim

#4 Special Ed

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Posted 20 August 2009 - 08:04 AM

Frank,

That's a wonderful and detailed representation of the eyepiece view--very well done. :) You've captured the turbulence in the NEB nicely.

Io is a lot harder to detect in front of a bright feature like the Equatorial Zone than some of the other Galilean moons are (e.g., Ganymede and Callisto). As you probably know, with Jupiter at opposition Io would have been *right* next to its shadow.

#5 frank5817

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Posted 20 August 2009 - 09:01 AM

Kris, Jim and Michael,

Thank you for your kind words. This time of year I get my best seeing but it didn't happen on this night.

Frank :)

#6 Sol Robbins

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Posted 20 August 2009 - 10:12 AM

Nice one Frank!

#7 rolandlinda3

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Posted 20 August 2009 - 10:19 AM

Wonderful sketch!! I looked and looked at this planet the other night at about 200 power under reasonable conditions. I must have some eyes issues because I just cannot get the level of detail with study, but I sure enjoy what you did and the others have done. Great and fun target.

#8 CarlosEH

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Posted 20 August 2009 - 01:47 PM

Frank,

An excellent observation of Jupiter. You have recorded much detail across the jovian disk (bright rifts and dark condensations in the NEB and SEB). The Great Red Spot (GRS) is actually the "Great Salmon-Pink Spot" at this time. Thank you for sharing it with us all.

Carlos

#9 frank5817

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Posted 20 August 2009 - 05:45 PM

Sol, Roland and Carlos,

Thank you gentlemen. :thanx:I have been having trouble getting satisfying glimpses of detail on Jupiter this year. Initially I could barely detect the shadow of Io but before long things settled down and I was seeing detail fleetingly.
---
Roland,

Something you might try if you have not already is to put a nebula filter between your eyepiece and objective. Sol, mentioned using one when he made a recent sketch on August 16th. It does work pretty well at times of poor seeing.

Frank :)

#10 Tommy5

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Posted 20 August 2009 - 06:40 PM

great sketch of jupiter and Io, you did a really nice job getting the turbulance in the neb very realistic sketch.

#11 frank5817

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Posted 20 August 2009 - 07:16 PM

Tommy5,

Thank you, :thanx: I hope you have been out observing Jupiter when you can. The atmosphere should start to settle down for us soon and it is well placed for viewing now.

Frank :)

#12 rolandlinda3

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Posted 20 August 2009 - 10:48 PM

Good idea. I will try it. I have a general filter but decent quality. Perhaps it will help.

#13 Dee

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Posted 21 August 2009 - 08:04 AM

Great sketch Frank , that extra mag makes such a difference .
Your saw a lot more detail than I did , great stuff.
I was sketching also , will post soon.

Dee

#14 Tom Machtemes

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Posted 21 August 2009 - 09:34 AM

Frank,

Nice sketch, you got both.

:thanx:

Tom

#15 kraterkid

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Posted 21 August 2009 - 10:00 AM

Beautiful sketch of the King and the shadow of Io Frank! :bow: :rainbow: :bow:

#16 frank5817

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Posted 21 August 2009 - 08:09 PM

Dee, Tom and Rich,

Thank you all for your kind words.:thanx: Jupiter is just about at its best for the year.

Frank :)

#17 Shannon s

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Posted 22 August 2009 - 11:06 AM

Wonderful sketch Frank. Lots of detail, love the moon shadow. :bow: :bow:

#18 frank5817

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Posted 22 August 2009 - 08:53 PM

Shannon,

Thank you for your kind words. I hope you get a chance soon to get out and sketch Jupiter and its moons again.

Frank :)

#19 Dr Morbius

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Posted 22 August 2009 - 10:20 PM

Now that's what I call a super sketch! Nice going!! :thewave:

#20 frank5817

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Posted 23 August 2009 - 07:37 AM

Steve,

Why thank you doctor. :thanx:

Frank :)






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