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What is the Blue line??

What is the Blue line??
Photo Information
Copyright: Subhash Ranjan (sranjan) Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 489 W: 63 N: 1877] (5784)
Genre: Landscapes
Medium: Color
Date Taken: 2010-11-21
Categories: Sky
Camera: Nikon D-200
Photo Version: Original Version
Date Submitted: 2010-11-22 9:37
Viewed: 3324
Points: 10
[Note Guidelines] Photographer's Note
Yesterday I shot this photograph of part of Moon with high magnification eye piece applied on Skywatcher telescope. I could appreciate a thin BLUE CIRCLE all around the moon. What was this??? There is no atmosphere on Moon...............then what was this blue border all around it!!!! Request explanation from anyone please.

Argus, eqshannon, oscarromulus has marked this note useful
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ThreadThread Starter Messages Updated
To Argus: Hellosranjan 1 11-28 01:20
To winterpalace: Hellosranjan 1 11-25 09:47
in our skies & phenomenawinterpalace 1 11-25 08:21
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Critiques [Translate]

  • strahos Gold Star Critiquer/Silver Workshop Editor/Gold Note Writer [C: 99 W: 12 N: 109] (807)
  • [2010-11-22 9:40]

it is the glow effect of the moon's light. It's just in the photo, there is no blue layer there ;-)

This magnification is mind boggling, Subhash.
Well, it might be difficult to explain that blue line along the rim, but let's hope more explanations emerge.

Probably this is blue yellow fringe dew to lens aberration.
Samiran Nandy

Hi Subhash

Very interesting image of the moon.

Did you see the blue line also with the telescope or only on the photo?



  • Great 
  • Argus Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 5038 W: 260 N: 15594] (50626)
  • [2010-11-27 8:51]
  • [+]

Hello Subhash,
A fine capture of part of a full moon.
I don't think the blue edge to the moon is chromatic aberration, but it may be the effect to of the reflected light of the moon being filtered down to the blue end of the spectrum after it has passed through the earth's atmosphere, I guess.
Thanks and kind regards,

Nice gear and glass and as fine a moon shot as I have seen. My legs very slowlybreturn. Perhaps one day I shall visit. My friend the three star general is back in Punjab for good. Didn't like our snow. You know those loose fitting shirts made and worn over there . The long waisted ones? I need one. Hives. And acute. One would be a blessing. Can you help. I m two extra large six foot two inches and 220 US pounds.

Dear Dr. Ranjan,
Am baffled???!!!???
Wonder what it is and how it got there???
Hope your lense is working well>>>>!!!

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