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First Quarter Moon, reprocessed with color, high resolution mosaic

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#1 Tom Glenn

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Posted 20 August 2019 - 03:45 AM

I've been playing around with LRGB composites of the Moon, and I happened to have some color data from April 12 that I hadn't touched until now.  This image was previously posted in monochrome, and here is a color version.  There isn't much color on the Moon, but there are subtle hints.  The color data comes from a Nikon D5600, using the C9.25 Edge HD.  Part of the reason I hadn't touched it until now is that I don't normally use the DSLR on that scope, and I wasn't happy with the outcome.  The D5600 doesn't have a mirror lock up mode, and so the best I could do was a 1.5s second delay between mirror up and shutter release.  This works fine on my 6" scope of 916mm focal length, but at 2350mm focal length with the C9.25, I was not getting sharp images on any of the shots.  Nevertheless, the data was good enough to color the monochrome image, again using the LRGB composite program developed by Rolf.

 

Full sized image is here:

 

https://live.staticf...67a16d3d3_o.png

 

 

48582718042_d922a506ae_b.jpgFirst Quarter Moon in Color by Tom Glenn, on Flickr

 


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#2 james7ca

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Posted 20 August 2019 - 04:15 AM

Tom, you've done a really good job with the tonality along the terminator. Good, dark shadows but still with nice detail. It's also a very sharp image and should be seen at full size (7000 x 10500 pixels) over on Flickr.


Edited by james7ca, 20 August 2019 - 04:16 AM.


#3 Lukes1040

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Posted 20 August 2019 - 06:48 AM

Look at the shadow from Rupes Recta! Really highlights the drop off nicely. Great image



#4 DMach

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Posted 20 August 2019 - 11:16 AM

Fantastic image Tom, nice subtle colour and processing. 



#5 Tom Glenn

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Posted 22 August 2019 - 12:45 AM

Thanks James, Lukes, and Darren for the comments.  In any image like this, I do spend the majority of my time dealing with the terminator, always in an effort to best mimic the natural lighting.  This is the most challenging aspect of any lunar image IMO, and it's very easy to lose detail to noise or shadows, or to have an otherwise unnatural appearance in this region.  Below are a few cropped regions that I like.  None of these crops are full scale, and really the image is best viewed in full to take in the wide field panorama, but I know that many people just quickly peruse the forum and don't bother clicking, so I will provide a few previews here.  Do click to enlarge.

 

Northern region including Montes Alpes, with the eastern rim of Plato along the terminator, at approximately 60% scale from the original.  

 

crop1_northern_terminator_TG.jpg


Edited by Tom Glenn, 22 August 2019 - 12:51 AM.

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#6 Tom Glenn

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Posted 22 August 2019 - 12:45 AM

Ptolemaeus region, at approximately 67% scale.  

 

crop2_Ptolemaeus_region_TG.jpg


Edited by Tom Glenn, 22 August 2019 - 12:51 AM.

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#7 Tom Glenn

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Posted 22 August 2019 - 12:46 AM

Southern terminator region, 50% scale.  

 

crop3_southern_terminator_TG.jpg


Edited by Tom Glenn, 22 August 2019 - 12:49 AM.

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#8 Tom Glenn

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Posted 22 August 2019 - 12:46 AM

Sea of Serenity and Sea of Tranquility at approximately 36% scale. 

 

crop4_Serenity_Tranquility_TG.jpg


Edited by Tom Glenn, 22 August 2019 - 12:48 AM.

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#9 Tom Glenn

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Posted 22 August 2019 - 01:00 AM

Look at the shadow from Rupes Recta! Really highlights the drop off nicely. Great image

Thanks, and I agree that the shadow on Rupes Recta is very dramatic here.  Interestingly, the slope of the feature is not quite as great as one might think.  Some reports you will encounter in lunar atlases refer to it as more of a gradual hill, although that information was based upon shadow analysis of older satellite imagery, and now we have much more precise laser altimeter data from the Lunar Reconnaissance Orbiter, which shows that it is somewhat more impressive than just a gradual hill.  The data indicates that the drop is abut 400m along much of the wall, which is rather sizable, and can exceed a 45 degree slope in places, although the slope is not constant, and there is some slumping along the escarpment that reduces it's slope at the top and bottom.  Below are a few images of the feature produced from LRO data under different lighting conditions, and an elevation profile of a section of the wall.  

 

Rupes_Recta_LROC.jpg

 

Rupes_Recta_line.jpg

 

Rupes_Recta_elevation_LROC.jpg

 

Rupes_Recta_profile.jpg


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#10 aeroman4907

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Posted 22 August 2019 - 06:12 AM

Tom, I particularly liked the 'Sword'. It jumped out to me before I even got to your description.



#11 Lukes1040

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Posted 22 August 2019 - 06:28 AM

Thanks for the additional info.

 

The first LRO image makes it look like a cliff, and the elevation profile leads to the same conclusion until you notice that the x-axis is in kilometers while the y-axis is in meters. A rough estimate shows the profile section is about 40% slope.

 

I browsed your first full size image for at least 30 minutes, although it took about 5 to load it.lol.gif



#12 lakeorion

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Posted 22 August 2019 - 09:18 AM

In awe.



#13 Rouzbeh

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Posted 24 August 2019 - 09:05 PM

Fantastic lunar images as usual.

#14 Tom Glenn

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Posted 25 August 2019 - 12:29 AM

Thanks Rouz and lakeorion for the comments.  Much appreciated! 




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