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Thursday, May 26, 2011

Cat's Eye Nebula, study of an apparent scale in the 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 some of the images to show the angular scale in a sky. 
The full Moon has an angular size of ~30 arc minutes, that's equal to ~0,5 degrees.

The full Moon

The "Cat's Eye Nebula"
Ra  17h 58m 33 Dec +66° 37′ 59"

Images are in HST-palette from the emission of ionized elements, R=Sulfur, G=Hydrogen and B=Oxygen.
NOTE. The size of the full Moon (0,5 degrees) is marked as scale.

Single image of the Cat's eye Nebula is used for this scale study. Image was taken with a Meade LX200 GPS 12" telescope at ~f5. QHY9 cooled astronomical camera and the Baader narrowband filter set.

Original image with a technical data:

The actual nebula is very small, rarely imaged outer halo is dominating the view.

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