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Sinus Iridium Ejecta and Beyond

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#1 frank5817

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Posted 18 November 2009 - 07:53 PM

The lunar feature known as the Jura Mountains includes the rim of the Sinus Iridium impact and is visible here in late day sunlight. The debris field can be seen extending westward to Mare Frigoris. All of Sinus Iridium is in shadow which gives this region an unfamiliar appearance. The impact that created the large mountainous debris field occurred during the Upper Imbrium period (3.8 billion years ago). Some of the mountains are a lofty 5 kilometers high. Superimposed on these mountains are two forty kilometer complex craters known as Mairan and Sharp; another similar sized crater can be seen on Mare Frigoris and is called Harpalus (39 km.). At high sun this crater shows a bright young crater ray system in addition to a fine glacis. There are 3 pillow-like features to the far left in the sketch at the edge of the Iridium ejecta. The two that are closest together are the famous large lunar domes known as Gruithuisen Gamma and Delta.
It is always worth while when not expecting a rigorous day ahead to get up a little earlier than usual to see what is going on in the sky before sunrise. This is especially true when the sky is clear and very transparent.

Sketching:

For this sketch I used: black Canson paper 9"x 12", white and black Conte'
pastel pencils , and Conte'crayons, a blending stump, plastic and gum erasers. Brightness was decreased -2 using the scanner for this sketch
Telescope: 10 inch f/ 5.7 Dobsonian with 9mm (161x) eyepiece
Date: 11-12-2009 11:00-12:00 UT
Temperature: -3°C (27°F)
Clear to partly cloudy, calm
Seeing: Antoniadi III
Co longitude 212.7°
Lunation days 25.27
Illumination 20.1%


Frank McCabe :)

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#2 kraterkid

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Posted 18 November 2009 - 10:08 PM

Simply exquisite sketch of the northwest rim of Mare Imbrium and the Jura Mountains coupled with a great commentary Frank! :bow: :jump: :bow: I love this area of the Moon. You've caught that beautiful arc of Mare Frigoris so wonderfully. The craters are sketched quite accurately and many are secondaries from the Imbrium basin impact. The rubble field of debris that forms these mountains is so carefully sketched. Frank, it is such a pleasure to such excellence! ::waytogo:

#3 frank5817

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Posted 19 November 2009 - 12:24 AM

Rich,

You are always most kind to this old sketcher. I am pleased you like the sketch. It was a dramatic view I had that morning. Some of the folks here may not know that you were the one that most encouraged me to be here sketching. You have set a great example for me and have always been very encouraging to all that sketch here. Thank you Rich.

Frank :)

#4 markseibold

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Posted 19 November 2009 - 05:14 AM

Frank

Beautiful sketch and as always, your technical information about the moons geology is a treasure trove to learn from.
:bow: :bow: :bow:

I remember seeing much of the Sinus Iridum region now if only roughly sketching around it; I need to take a closer look sometime. I know I am missing allot of details.

Thanks again for this wonderful post [you have me opening my books now to study the Sinus Iridum region]

Mark

#5 frank5817

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Posted 19 November 2009 - 09:53 AM

Mark,

Thank you very much.:thanx: As Rich mentioned above it is a fascinating and impressive lunar region. Be sure to also read--http://www.lpod.org/?m=20070727 . This is the LPOD for July 27, 2007.

Frank :)

#6 Jef De Wit

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Posted 19 November 2009 - 10:49 AM

Frank
Congratulations with your ASOD!

#7 perfessor

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Posted 19 November 2009 - 12:06 PM

Frank, that’s a great sketch of a wild and wonderful region. I’ve always been attracted to the contrast between the rough regions outside, and the smooth region inside the impact basin. I’ve only attempted one sketch in the area (of Bianchini), but I keep eyeing the Jura Mountains. One of these days …

#8 CarlosEH

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Posted 19 November 2009 - 01:27 PM

Frank,

An excellent observation and report of the Sinus Iridium ejecta region. This is a very interesting and complex region of the Moon. I will have to check out this region. Thank you for sharing it with us all.

Carlos

#9 frank5817

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Posted 19 November 2009 - 09:40 PM

Jef, Tom and Carlos,

Thank you all very much. It was a beautiful morning and the moon looked great.

Frank :)

#10 Uwe Pilz

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Posted 20 November 2009 - 03:08 AM

I neve observed Sinus Iridium in this light. But it is worth to do!

#11 niteskystargazer

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Posted 20 November 2009 - 11:05 AM

Frank,

:), very nice sketch.

:thanx:,

Tom

#12 Shannon s

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Posted 20 November 2009 - 01:05 PM

Excellent sketch and report, Frank. :bow: :bow: :bow:

#13 Tommy5

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Posted 20 November 2009 - 07:32 PM

Great sketch and interesting report,the weather should be great this weekend for observing.

#14 frank5817

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Posted 20 November 2009 - 09:05 PM

Uwe, Tom Shannon and Tommy5,

Thank you all. :thanx: As soon as I go out of town the weather clears in Chicago.

Frank :)

#15 JayinUT

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Posted 20 November 2009 - 09:29 PM

Frank,

Your an inspiration on sketching the moon. :bow: :bow: :bow: Sketching a small part of the moon is something I mean to try, but keep making excuses for not doing. As always I enjoy looking at this observation and sketch. :jump: :jump:

#16 frank5817

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Posted 21 November 2009 - 11:33 AM

Jay,

Thank you and back at you on those deep sky sketches. It is always a pleasure to see them here.

Frank :)

#17 Special Ed

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Posted 24 November 2009 - 10:34 AM

Frank, I'm behind on comments as usual but wanted to let you know how well this early bird sketch of yours illustrates the debris field you discuss in your notes. :)

#18 Odin

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Posted 24 November 2009 - 04:31 PM

Frank...Thanks for the Awesome Sketch and Detailed Notes... very Inspirational :goodjob:

#19 frank5817

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Posted 25 November 2009 - 03:23 PM

Michael and Rudy,

Thank you both for your nice words about my sketch.
Sketching and observing the moon are a real joy.

Frank :)






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