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Crater Euclides and Montes Riphaeus

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#1 frank5817

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Posted 01 December 2009 - 12:11 AM

In southern Oceanus Procellarum not far from mare Cognitum you can locate a bright little Copernican era crater that formed after the last of the dark lava had solidified. This little 12 kilometer crater wearing the bright ejecta blanket is Euclides. The bright ejecta makes it easy to pick out at high sun and with a little bit of shadow and high magnification the nearby Riphaeus mountains also show some fine relief. In the upper left of the sketch note the front range of these mountains which date back 4 billion years. These mountains are likely the remains of a very large crater rim that was not completely buried in the lava flooding. Other similar sized and smaller craters in the region also reveal some bright ejecta betraying their young ages. To learn more read the LPOD caption for May 24, 2006, http://www.lpod.org/?m=20060524.

Sketching:

For this sketch I used: black Canson paper 10"x 12", white and black Conte'
pastel pencils , and Conte'crayons, a blending stump, plastic and gum erasers. Brightness was decreased -2 and contrast increased +2 using the scanner for this sketch
Telescope: 10 inch f/ 5.7 Dobsonian with 6mm (241x) eyepiece
Date: 11-28-2009 4:15-5:40 UT
Temperature: 0°C (32°F)
Clear becoming partly cloudy, calm
Seeing: Antoniadi II -III
Co longitude 44°
Lunation 11.4 days
Illumination 80.7%

Frank McCabe :)

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#2 kraterkid

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Posted 01 December 2009 - 01:15 AM

Absolutely goreous Frank! :rainbow: :bow: :bow: :bow: :rainbow: Fantastic detail of Euclides and the ancient Riphaeus range! :waytogo: I noted that the domes in this area would not be visible at your colongitude so it is a very accurate representation. Awe inspiring! And a riveting commentary! :D

#3 frank5817

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Posted 01 December 2009 - 02:03 AM

Rich,

Thank you much for your kind remarks. :thanx: I knew the domes were there but with the current lighting they were not visible. Back in September I did a graphite sketch of this region but I did not post it here.

Frank :)

#4 Tommy5

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Posted 01 December 2009 - 09:00 PM

great lunar sketch and interesting narrative,thanks for posting.

#5 frank5817

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Posted 02 December 2009 - 12:18 AM

Tommy5,

Thank you.:thanx: Hope you get in some observing and sketching time soon.

Frank :)

#6 Uwe Pilz

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Posted 02 December 2009 - 03:40 AM

Wonderful! I know how hard it ist to sketch these very dark features (especially rims). I like the moon because we can see what happend here. Your sketch shows this for the region selected. Thank you.

#7 frank5817

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Posted 02 December 2009 - 10:11 PM

Uwe,

Thank you for your kind remarks. :thanx: Yes this is a very interesting and under observed lunar region.

Frank :)

#8 Special Ed

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Posted 03 December 2009 - 07:56 PM

Frank,
Nice drawing and a striking composition with Euclides the center of attention. :cool:

Most are familiar with Euclid the great 4th century BC Greek mathematician (so long ago!), but you may be interested to know that Montes Riphaeus is the original name of the Ural Mountains.

#9 frank5817

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Posted 03 December 2009 - 10:25 PM

Michael,
Thank you. :thanx:
On one of my early moon maps from the early 1960's I have the Riphaeus mtns. labelled as shown below.

Frank :)

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#10 CarlosEH

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Posted 04 December 2009 - 05:02 AM

Frank,

An excellent observation of Euclides and Montes Riphaeus. This is a very interesting region of the Moon, as you point out. Thank you for sharing it with us all.

Carlos

#11 JayinUT

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Posted 04 December 2009 - 07:12 AM

Frank,

Tremendous capture of this wonderful feature. Any advice for someone going to try their first lunar sketch this next first quarter and a good object?

I know to keep it to a smaller object, just looking for advice on techniques (using pencils the first time) and what object if you don't mind.

#12 jayscheuerle

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Posted 04 December 2009 - 09:52 AM

Frank, the subtleties in the dome shadings are really effective. Thanks for sharing! - j

#13 frank5817

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Posted 04 December 2009 - 12:00 PM

Carlos, Jay n UT, Jay S,

Thanks to all of you for your nice comments. :thanx:

-----
Jayin UT - The next first quarter moon will be Christmas eve. If I were going to pick a target in advance, I would choose a big easy target on the moon for a first sketch it would be the crater pair Aristotles and Eudoxus. These are far enough north and far enough from the terminator to remain the same in appearance for a long while. This way you can take your time. Also they are really fun to sketch.

Frank :)

Virtual Moon Atlas images attached

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#14 niteskystargazer

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Posted 04 December 2009 - 12:18 PM

Frank,

:), very nice sketch.

:thanx:,

Tom

#15 Jef De Wit

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Posted 04 December 2009 - 02:34 PM

Frank

Very impressive with all the details!

I have a fiew questions about your technique.
1) I marked that you allways change the brightness and contrast with scanning your sketches. Do you some other "post-production"?
2) Do you start sketching the background or the details?

#16 frank5817

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Posted 04 December 2009 - 06:46 PM

Jef,

Thank you. :thanx: For this sketch I sprinkled some powdered white Conte' crayon shavings from my sharpening of the pencils on emery boards. I keep these shavings in a 35mm film case. So I did the background first. Then with a sharp set of Conte' white pastel pencils I roughed in an outline of the features i.e. craters, mountains. Some adjustment is always necessary to get the features correctly placed and shaped before going on with the details.
When it comes to scanning I should probably adjust my scanner to scan properly from the beginning. I adjust the brightness and contrast to make the sketch look as much like the original as I can.
I hope this helps.
I should also say that many times I start with the main features and put the background in second and then do the details. I tend to work this way if the background is very bright.

Frank :)

#17 mickmrn1

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Posted 04 December 2009 - 10:42 PM

Very impressive sketch Frank! Keep up the great work!!

#18 frank5817

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Posted 04 December 2009 - 11:41 PM

Tom and Michelle,

Thank you both for your responses.

Frank :)

#19 markseibold

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Posted 06 December 2009 - 05:09 AM

Frank

Another beautiful work by you and your informative text is always a great joy to read. :bow: :bow: :bow:

Nice tutorial explaining your process too. I have never thought of saving my chalk filings for future use. A very resourceful and useful tip from you here.

Also, thanks for the heads up on the next first quarter opportunity for an interesting feature to render.

Now I just wish we would get up above freezing temps and without wind here in Portland.

Mark

#20 frank5817

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Posted 06 December 2009 - 11:56 AM

Mark,

Thank you for your nice comments.:thanx:
The self motivation needs to be high this time of year with the less than ideal weather conditions. Now and then we do get those winter breaks we can take advantage of.

Frank :)

#21 Jef De Wit

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Posted 12 December 2009 - 07:48 AM

Frank
Congratulations with your ASOD!

#22 NUNKY

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Posted 13 December 2009 - 08:56 AM

Trés beau dessin lunaire Franck ! :bow:

#23 frank5817

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Posted 13 December 2009 - 07:08 PM

Jef and Christian,

Thank you both. :thanx:
------
Christian,

Merci pour vos mots gentils. :thanx:

Frank :)

#24 CarlosEH

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Posted 13 December 2009 - 09:57 PM

Frank,

Congratulations on the posting of your fine observation in ASOD. Your observation merits it!

Carlos

#25 Jef De Wit

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Posted 26 December 2009 - 03:56 PM

Frank
I sketched this evening the same region than your sketch. Not really competition for your beautiful work... but I used a smaller telescope (7cm) and less amplification (x150).
I don't why, but I'm not satisfied with the result. In reality the mountains around Euclides made a beautiful flower in the eyepiece. I didn't succeeded to put that feature on paper quit well. Maybe I drew the mountains to big? I'm not satisfied with the blending (with a cotton swab) either.
One moment the image dimmed in the eyepiece. I looked up and there were some (ice)clouds beforen the moon with a beautiful rainbow (it was not a halo) around our satellite! The first time I saw that. I ran inside for the camera and managed to take two (bad) pictures before it disappeared. Only for that it was worth trying to sketch this region.

26/12/2009, 17.45-18.45 UT, ETX-70 @ x150, white and black pencil on black paper, scanned and mirrored, no processing (this is the raw eyepiece-sketch)

BTW The second, small crater is in reality a mountain!

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