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Thursday, August 11, 2011

Butterfly Nebula, apparent scale in the sky, a horizontal edition

I have shot many targets with several focal lengths. 
Due that, I will publish some images 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 "Butterfly Nebula"
In constellation Cygnus

NOTE. The size of the full Moon (0,5 degrees) is marked as a gray circle in all of the images.
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.

Natural color composition from the emission of ionized elements, R=80%Hydrogen+20%Sulfur, G=100%Oxygen and B=85%Oxygen+15%Hydrogen to compensate otherwise missing H-beta emission. This composition is very close to a visual spectrum.

NOTE. The size of the full Moon (0,5 degrees) is marked as a scale.

A vertical version of the series above:

Images used in the series above

First image is a three panel mosaic of the "Cygnus Trio"
Second one is two panels from a mosaic.
Third is a one panel
fourth is a zoomed crob from the above image.

The mosaic wide field was shot with a Tokina AT-X 300mm f2.8 camera lens with a QHY8 astro camera and a Baader narrowband filter set

All images in this page have been part of an older mosaic, the "Cygnus Trio"
It was my very first APOD (Astronomy Picture Of  Day) published  by NASA.

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