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Sunday, July 17, 2011

"Monkey Head Nebula", NGC 2175/Sh2-252, apparent scale in a sky

I have shot many targets with several focal lengths. 
Due that, I will publish some of my material as an image sets, with different field of view and detail levels.
The fractal nature of our universe stands out nicely by this way and it will make the orientation more easy.

Many times, it's difficult to understand the image scale of astronomical images.
Due that, I will add a Moon circle in images to show the scale in a sky. 
The full Moon has an angular size of ~30 arc minutes, that's equal to ~0,5 degrees.

Sharpless 252, the "Monkey Head Nebula"
In constellation Orion

Images are in HST-palette, (HST=Hubble Space Telescope)
from the emission of ionized elements, R=Sulfur, G=Hydrogen and B=Oxygen.
Star colors are mixed from the NB channels, Red=H-a, G=O-III and B= 85%O-III + 15%H-a.
NOTE. The size of the full Moon (0,5 degrees) is marked as a gray circle in all of the images.

Images used in the series above, from top to bottom
    1. A wide field image of IC 443 and NGC 2175, the "Monkey Head Nebula". Image is taken with a Canon FD200mm f2.8 camera lens.
    2. A zoomed in version of previous image
    3. A close up of the "Monkey Head Nebula" imaged with a Meade LX200 GPS 12" telescope, focal lenght ~2000mm
Links to an original images used in series from to to bottom
It really does look like a head of a monkey...

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