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Crater Pair Klaproth and Casatus

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#1 frank5817

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Posted 02 September 2009 - 09:51 AM

While observing the moon on the last evening of August, I was looking for a target to sketch while I was enjoying the view. I wanted to pick a crater or two I had never sketched before but one that would be an interesting target. It wasn’t long before the ancient crater pair of Klaporth and Casatus caught my eye and both together became my target. Klaproth and Casatus are Pre-Nectarian period impact scars on the lunar southern highlands. Klaproth is the larger and older of the two with a diameter of 119 km compared to 111 km for Casatus. It is easy to see that crater Casatus slightly overlaps the southern wall of Klaporth but both craters appeared to have taken a terrific beating over a very long time. Neither of these large walled-plain craters exhibits a central peak and both have nearly flat floors. Small craters on these floors were appearing off and on in the eyepiece during the sketch as the seeing improved for brief intervals. The rims of both craters are high above the floors. The top of the rampart of Casatus stands nearly 6 km above its floor. The light color to the floors of these craters has led lunar geologist Chuck Wood to speculate they may be the result of non-mare volcanism (see LPOD for August 5, 2006 http://www.lpod.org/?m=20060805) .
I feel I spent quality time observing and attempting to capture the view of this southern highland pair.


Sketching:

For this sketch I used: white sketching paper 10”x 8”, HB, 4B, 6B graphite pencils, a blending stump and a gum eraser. After scanning, Brightness was decreased (-3) and contrast increased (+2) using Microsoft Office Picture Manager.

Telescope: 10 inch f/ 5.7 Dobsonian and 6 mm eyepiece 241x
Date: 9-1-2009, 3:30 - 4:45 UT
Temperature: 15° C (58° F)
clear, calm, 45% humidity
Seeing: Antoniadi III
Colongitude 53.4°
Lunation 11.9 days
Illumination 90 %

Frank McCabe :)

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#2 Tom Machtemes

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Posted 02 September 2009 - 10:10 AM

Frank,

:ooo:, very nice sketch, I like it, looking for your next.

:thanx:,

Tom

#3 Tommy5

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Posted 02 September 2009 - 07:07 PM

Very nice sketch of this lunar pair glad to see your taking advantage of this late summer clear, calm weather

#4 frank5817

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Posted 02 September 2009 - 07:33 PM

Tom and T5,

Thank you both for your comments and nice words. Have you noticed how nice the weather became as the weekend closed?:shrug:

Frank :)

#5 kraterkid

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Posted 02 September 2009 - 08:28 PM

Masterful graphite pencil sketch Frank! :bow: :applause::bow: You have done a marvelous job with these two ancient highland giants. Beautiful shading and wonderful treatment of the perspective of the surrounding environs. Just a breathtaking sketch! ::waytogo:

#6 perfessor

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Posted 02 September 2009 - 09:38 PM

Very nice Frank. I'll have to add these to a list for seeking out later.

#7 rolandlinda3

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Posted 02 September 2009 - 09:52 PM

I can see the depth you are talking about. Nice sketch and view.

#8 frank5817

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Posted 03 September 2009 - 10:36 AM

Rich, Tom and Roland,

Thank you all. :thanx: It was one of those rare,comfortable evenings for sketching.

Frank :)

#9 mickmrn1

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Posted 04 September 2009 - 08:17 PM

Very nice sketch and view. I am glad your weather is better and looking forward to further sketching...

#10 frank5817

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Posted 05 September 2009 - 08:45 PM

Michelle,

Thank you. It looks like you are with rhe rainy weather now.

Frank :)

#11 Dee

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Posted 06 September 2009 - 11:58 AM

Great stuff Frank, not your usual method , so cool

Dee

#12 rolandlinda3

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Posted 06 September 2009 - 09:50 PM

Frank, I was looking at your sketch again and a thought occurred to me that may never take place, but it would sure be fun.....I have been on the shoreline of Chicago where the double-deck set of stores/food/etc. is on top of that major pier. There is lots of open concrete near the end on the side and one top; the slips often have a couple of beautiful sailing craft or powered craft. What a wonderful place one day to calmly go out with a couple of cases with refractors, calmly set up for sketching, catch the rising full moon with the context of a boat or people or whatever, have a third or 4th person getting folks to look through scopes and introduce them to the skies, and the sketchers, using a little video-out from astro camera, piece together and talk about the development of a sketch. In an hour I will bet it would draw 500 people, most of which had never looked through serious optics or observed, and perhaps one in 20 might get the bug to look up in the future to start capturing what we see on a regular basis.

#13 frank5817

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Posted 06 September 2009 - 10:38 PM

Dee and Roland,

Thank you both for your nice words.:thanx:
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Roland,
You paint a great scene for an observing session, public viewing and sketch. If I thought I could pull it off, I might just give it a go someday.

Frank :)

#14 Special Ed

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Posted 07 September 2009 - 05:52 PM

Frank,

Great sketch with lots of depth. I like your graphite sketches as much as your Conte' sketches--you are a real switch hitter. ;)

#15 kraterkid

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Posted 07 September 2009 - 10:11 PM

Michael, it's good to have him batting on our team! Posted Image

#16 frank5817

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Posted 08 September 2009 - 05:43 AM

Michael and Rich,

Thank you gentlemen for the nice words. Rich, that is a cool animation.

Frank :)

#17 CarlosEH

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Posted 10 September 2009 - 05:27 AM

Frank,

I am sorry that I missed your excellent observation and report of Klaproth and Casatus. You have recorded this ancient lunar terrain very nicely. Thank you for sharing it with us all.

Carlos

#18 frank5817

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Posted 10 September 2009 - 10:16 AM

Carlos,

Thank you very much. :thanx: See you didn't miss it.

Frank :)






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