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Tuesday, August 9, 2011

The "Pelican Nebula", apparent scale in a sky, second edition

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.

Pelican Nebula

In constellation Cygnus

Click for a large images

HST-palette, (HST= Hubble Space Telescope)
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 a scale.

The Pelican Nebula (also known as IC5070 and IC5067) is an Hydrogen emission region associated with the North America Nebula in the constellation Cygnus. The nebula resembles a pelican in shape, hence the name. The Pelican Nebula is , close to Deneb, and divided from its brighter, larger neighbor, the North America Nebula, by a molecular cloud filled with dark dust. Distance is about 1800 light years

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.

Two images are used for the series, first is a wide field shot with a Tokina AT-X 300mm f2.8 camera lens. 
Second image, at the bottom, is shot with a Meade LX200 GPS 12" reduced under 2000mm. 
Baader narrowband filter set was used with both images, wide field was shot with a QHY8 and closeup with QHY9 cooled astronomical cameras.

Original images with technical details

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