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Images of The Moon


ScottE
(@scotte)
Member Moderator
Joined: 1 year ago
Posts: 9
Topic starter  

Kicking things off in this sub-category by posting a capture of the Moon.

This image was captured with a Celestron NexStar 6 Evolution with a Canon Rebel as Prime Focus. This is a single frame image. It was taken on January 21, 2020 (a year ago).


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TerriZ
(@terriz)
Member Moderator
Joined: 1 year ago
Posts: 20
 

Great shot Scott!!    Love the detail!


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ScottE
(@scotte)
Member Moderator
Joined: 1 year ago
Posts: 9
Topic starter  

Image upload was blocked with a "Too Big" message. It was 2.01MB, which is over the 2MB limit. Trying another. - Edit: Reply with attachment successful. Issue yesterday may have been a Server/WordPress hiccup. 

This post was modified 2 weeks ago by ScottE

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Lisakirchberg
(@lisakirchberg)
New Member
Joined: 6 days ago
Posts: 1
 

This is beautiful! I love the texture of light along the dark line.

LS Kirchberg


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Paul Walker
(@pwalker)
Member Admin
Joined: 8 years ago
Posts: 12
 

Moon, first quarter

Date: 3/31/2020
7.6 days old
Stack of 24 images taken at prime focus. 1/250 sec, ISO 200.
Telescope: 10" f/5.6 Newtonian on equatorial mount.
Camera: Canon T7i (24 Mp, APS-C size sensor)
Image scale: 0.52 arc sec/pixel (the telescope's theoretical resolution limit, depending on who's numbers you use is somewhere around 0.3 to 0.5 arc seconds so this is a good match)
The Moon was 236,740 miles distant at the time so 1 pixel = 0.6 miles on the surface.
The calculation:
tan (angle) = opposite side / adjacent side
opposite side = tan (angle) X adjacent side
miles on surface = tan (0.525 arc sec / 3600) X 236,740 miles = 0.602 miles

This image shows features as small as is typically visible in medium sized amateur telescope in good seeing.
I viewed the Moon visually before I took the shots for this image. Actually the smallest features are easier to see in the image than I could see them visually. This is due primarily to the increased contrast of the image. The larger features are also more readily visible for the same reason.
Typical good seeing in Vermont is 1 to 2 arc seconds.
2 pixels (1 arc sec) = 1.2 miles on the Moon's surface.
3 pixels (1.6 arc sec) = 1.8 miles
4 pixels (2.1 arc sec) = 2.4 miles
The resolution of this image is good enough to detect craters and similar features at least as small as about 2 miles.
Some linear features as small as 1 mile should be visible. Maybe even down to 1/2 mile wide if the contrast with the adjacent the area is high enough.
For those familiar with Fresnel Rile near the Apollo 15 landing site at Hadley Rile and Hadley Crater, some parts of Fresnel Rile that are only about 1/2 mile wide are detectable in this image. The parts of Fresnel Rile that are 1.5 miles wide are easy to see. Hadley Rile and Hadley crater are not visible because they are still in the shadow of the hills to the East of them.

 


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TerriZ
(@terriz)
Member Moderator
Joined: 1 year ago
Posts: 20
 

Great shots Paul!   Wonderful detail!

 

T


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Paul Walker
(@pwalker)
Member Admin
Joined: 8 years ago
Posts: 12
 

Date: 2/21/2021
10 days old
Stack of 20 images taken at prime focus using Registax 6.
1/250 sec @ ISO 200.

Telescope: 10" f/5.6 Newtonian on equatorial mount.
Camera: Canon T7i (24 Mp, APS-C size sensor)
Image scale: 0.52 arc sec/pixel

The is seeing (atmospheric turbulence) was good.

This is what the Moon looked like visually through the 10" f/5.6 telescope.

 Moon_10d_2021-02-21_10inF5.6_prime_T7i_20x1-250th@iso200-BW.jpg

 
This is the same image enhanced using Registax 6 - sharpened with "wavelets" and histogram adjusting using the Gamma tool.
 
This post was modified 1 day ago 7 times by Paul Walker

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