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Craters Mercator, Campanus and Ramsden at Sunrise

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#1 frank5817

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Posted 21 April 2013 - 08:55 PM

After another canceled public telescope viewing Friday evening due to thick clouds and light snow, I was pleased to see a nice Saturday filled with sunshine followed by a clear night.
With no particular sketching targets in mind, I scanned the terminator for interesting sketching targets and stopped when I could see sunrise at Ramsden (26 km.) along with all those crisscrossing rimae (rilles).
Northeastward away from Ramsden and across Palus Epidemiarum, I also added two additional ancient craters Mercator (49 km.) and Campanus (49 km.).
This break in our poor Chicagoland spring weather was long overdue.

Sketching:

For this sketch I used: 400 series black Strathmore Artagain paper 9"x9", white and black Conte’
pastel pencils , and Conte’crayons, a blending stump, plastic eraser.
Telescope: 10 inch f/5.7 Dobsonian with 6mm (241x)
Date: 4-21-2013 01:00 – 02:45 UT
Temperature: 7.2°C (45°F)
Weather: clear, calm
Seeing: good Antoniadi II-III
Co longitude: 35.4°
Lunation: 10.6 days
Illumination: 74.1%

Frank McCabe :)

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#2 frank5817

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Posted 21 April 2013 - 08:56 PM

with labels

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#3 Uwe Pilz

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Posted 21 April 2013 - 11:15 PM

The rimae look great at your sketch I enjoyed them very much. This was the ideal light for that target.

#4 Aquarellia

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Posted 21 April 2013 - 11:56 PM

It's always a good moment while looking at your sketches Frank. What is interesting as well is that you share your technic with us. This sketch is just fantastic. Thank you !

#5 Jef De Wit

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Posted 22 April 2013 - 03:37 AM

Frank, again a beautiful sketch! Those rilles are a joy for the eye.

#6 kenrenard

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Posted 22 April 2013 - 05:50 AM

Frank,
Amazing work! You have captured the complex structure of the Moon beautifully.


Ken

#7 PeterDob

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Posted 22 April 2013 - 06:30 AM

Very impressive work, Frank, as always. The various ground shades, the shadows an bright rims... You caught it all beautifully. I wish I had your talent.

Peter

#8 frank5817

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Posted 22 April 2013 - 10:09 AM

Uwe, Michel, Jef, Ken and Peter,

The lighting was just perfect for the Ramsden region. Thanks for your kind remarks.

Frank :)

#9 kenrenard

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Posted 22 April 2013 - 10:14 AM

Frank,
I have a question on the shadows. Do you use the black Conte pencil to create or and eraser with a shield? After working on the Moon a few times this weekend. I know how difficult this is to capture. I am in awe of your talent.


Ken

#10 frank5817

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Posted 22 April 2013 - 10:53 AM

Hi Ken,

I usually do the sketch entirely in white pastel and make an outline of shadows in white pastel to lock in their positions. I then return to shade in using black pastel (sometimes I use medium black charcoal)at the end. If you do try sketching this way the sketch will look very flat before you add in the black. I do not like eraser shields much. The less materials I have scopeside the happier I am.
I do keep shaped erasers in my kit. Using sandpaper I have wedge shaped ones, pointed ones, square ones, etc.

Frank :)

#11 kenrenard

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Posted 22 April 2013 - 10:57 AM

Thanks Frank,
I am always interesting in learning techniques. I tried the eraser shield with a gum type eraser. I was able to get some shadows but not want I saw. As the Moon gets fuller it has become harder to capture at least for me. I still need to keep it simple. I certainly have enjoyed viewing your work. Thank you again for your tips and words of wisdom.

Clear Skies

Ken

#12 Andrev

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Posted 22 April 2013 - 11:28 AM

Frank.

This a truly nice sketch. Beautiful.

Andre.

#13 niteskystargazer

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Posted 22 April 2013 - 12:23 PM

Tom

Very good sketch of Craters Mercator, Campanus & Ramsden :).

CS,KLU,

:thanx:,

Tom

#14 cpl43uk

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Posted 22 April 2013 - 02:52 PM

Beautiful. Simply beautiful.

#15 Erix

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Posted 22 April 2013 - 03:21 PM

Very beautiful sketch, Frank!

#16 frank5817

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Posted 22 April 2013 - 07:09 PM

Andre, Tom, Chris and Erika,

Thank you all for your nice words.
I look forward to sketching more now that the winter and poor spring weather patterns seems to be abating.

Frank :)

#17 rolandlinda3

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Posted 23 April 2013 - 08:33 PM

Makes me smile again, Frank.

#18 frank5817

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Posted 24 April 2013 - 10:55 PM

Roland,

Thank you. I'm glad it did.

Frank :)

#19 maroubra_boy

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Posted 25 April 2013 - 06:53 PM

Groovy, Frank! Literally, those riles are groovy!

Mate, this has got to be one of your finest pieces. The detail and faithful recreation is beautiful & remarkable. Congratulations.

#20 frank5817

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Posted 26 April 2013 - 06:54 PM

Thank You Alex,

I appreciate what you have said.
I certainly look forward to seeing more sketches from you; they are always inspiring in the same way that the late Scott Mellish sketches will always be to me.

Frank :)

#21 Tommy5

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Posted 27 April 2013 - 08:45 PM

Wow great sketch you really captured those lunar rilles accurately.

#22 ericj

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Posted 28 April 2013 - 02:22 PM

Another great set of sketches Frank.

Do you have equatorial mounts for your Dobs? Or have you gotten to the point where you can sketch just fine without one?

I have one for my scopes but mostly use then on alt-az mounts for ease of use and quick set up.

http://ejamison.net/...rdobmounts.html

Best,

Eric Jamison

#23 frank5817

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Posted 29 April 2013 - 01:20 AM

Tommy5 and Eric,

Thank you both for your comments.

___
Eric,

I have two scopes on equatorial mounts. A 4.25" reflector and a 4" refractor. The 4" refractor is clock driven. I also have a Dobsonian equatorial platform for my scopes less than 13" inches. My 18" currently does not have a platform; I started building one then stopped then started again but never finished. Someday I will finish it.
I also plan to rebuild the 18" scope to reduce weight then I'll finish the platform.

Frank :)






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