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Dawn Breaking across Crater Schickard

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#1 frank5817

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Posted 27 February 2010 - 02:26 AM

One of the many large and interesting craters on the visible lunar surface is this 230 km. diameter walled plain crater known as Schickard. This Pre-Nectarian crater is somewhat isolated from craters of equal size. It is the large, shallow floor of Schickard that presents its most interesting features and at the time of this sketch light was just beginning to spread across its floor. Tens of millions of years after this crater formed a much larger impact formed the Orientale basin, blanketing the crater with highland ejecta. This great crater can easily be seen in a modest telescope with good lighting one or two days before full moon.

Sketching:

For this sketch I used: Black Canson sketching paper, 14”x 12”, White and black Conte' pencils, a blending stump, plastic eraser. After scanning, contrast was increased (+1) using the scanner.

Telescope: 13.1 inch f/5.9 Dobsonian and 9mm eyepiece 218x
Date: 2-26-2010, 1:45 – 2:30 UT
Temperature: -6° C (21° F)
clear, calm
Seeing: Antoniadi III
Co-longitude: 57.5°
Lunation: 11.98 days
Illumination: 90.4 %

Observing Location: +41°37' +87° 47'
Oak Forest, Il.

Frank McCabe :)

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#2 Uwe Pilz

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Posted 27 February 2010 - 02:47 AM

Simply great! I know how hard it is to sketch such a large crater. You have to cover a giant range of brightness and a vast amount of details.

#3 S1mas

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Posted 27 February 2010 - 06:27 AM

Impressive Frank :)

#4 Jef De Wit

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Posted 27 February 2010 - 07:49 AM

Frank, impressive sketch... I have still a lot to learn... I sketched the same crater yesterday and had a nice view on the ejecta you mentioned. It makes the craterfloor looking like a tricolor!
I'm used to sketch the Moon with a ETX-70. Two weeks ago I bought a WO Zenithstar 80 Doublet Fluo and tested it outside for the first time. Wow! That's something else than the little Meade! But more detail makes it more difficult to sketch... I still struggle with getting all the grey-differences right.

26/02/2010, 21.30-22.30 UT, WO Zenithstar 80 @ x139, 95%, 12.8 days, alt 53°, black & white Conté pencils on black paper, scanned and mirrored.

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#5 Jef De Wit

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Posted 27 February 2010 - 07:50 AM

And here my new beautie...

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#6 frank5817

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Posted 27 February 2010 - 10:58 AM

Uwe, S1mas and Jef,

Thank you for the nice words. :thanx:

---
Jef,

That is a great sketch of Schickard. With the floor well illuminated you captured those two dark lava features very well.
Impressive looking scope. Thanks for showing us this beauty.

Frank :)

#7 JayinUT

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Posted 27 February 2010 - 11:13 AM

Frank,

Nicely done, I always enjoy your moon sketches. They help me in mine when the storms of late allow me to view.

#8 Tommy5

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Posted 27 February 2010 - 05:40 PM

Cool lunar sketch, glad you able to catch some observing time, nice use of texture and shadows congrads.

#9 frank5817

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Posted 27 February 2010 - 06:20 PM

Jay and T5,

Thanks for your comments. :thanx: Seeing wasn't the best and it remains just a bit too cold for my sketching pleasure.
I hope you two get a chance to get out there soon.

Frank :)

#10 mathteacher

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Posted 27 February 2010 - 07:09 PM

Frank, simply awesome.

#11 frank5817

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Posted 28 February 2010 - 01:29 AM

Ging-Li,

Thank you for your compliment. :thanx: The site of sunrise across a large lunar crater is really something to see.

Frank :)

#12 CarlosEH

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Posted 28 February 2010 - 02:43 AM

Frank,

An excellent observation and report on Schickard on the dawn terminator. The detail is interesting over the floor of Shickard. Thank you for sharing it with us all.

Jef- An excellent observation of Schickard as well. You have recorded detail over the floor of Schickard. Your new instrument looks great! I hope that you enjoy many excellent views of the heavens with this new instrument.

Carlos

#13 Jef De Wit

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Posted 28 February 2010 - 05:43 AM

Frank and Carlos, thanks for the nice words.

#14 frank5817

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Posted 28 February 2010 - 08:52 PM

Carlos,

Thank you for your nice words.:thanx: I was making this close sketch while you were sketching your beautiful Moon-Mars pair.

Frank :)

#15 niteskystargazer

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Posted 01 March 2010 - 12:18 PM

Frank

:waytogo:, nice sketch :).

:thanx:,

Tom

#16 mike bacanin

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Posted 01 March 2010 - 01:39 PM

Frank,

Lovely sketch indeed!

Mike

#17 ladip63

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Posted 01 March 2010 - 05:05 PM

Just gorgeous Frank. :bow: :goodjob:
Lynn

#18 frank5817

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Posted 01 March 2010 - 05:53 PM

Tom, Mike and Lynn,

Thank you all for your nice words about my lunar sketch.:thanx:

Frank :)






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