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Monday, June 6, 2011

IC1805, the "Heart Nebula", 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.



IC 1805 zoom in series with a Moon scale circle

In constellation Cassiopeia.



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



Images used in the series above from top to bottom

  1. A wide field image from 2008.  with a Canon FD 200mm f2.8 camera lens and a QHY8, a cooled astronomical camera with a H-alpha and UHC-s filters. Total exposure time ~2,5h

  2. A wide field image of the area, covering about 5 degrees, ~300', of the sky. (Ten full Moons side by side)
    IC 1805, the "Heart Nebula", locates at upper Right and  IC 1848 can be seen at lower Left. Image is shot with a Canon EF 200mm f1.8 camera lens and a QHY9, a cooled astronomical camera.
    Baader narrowband filter set, total exposure time was ~1,5 hours (A very fast lens was used!).

  3. A medium wide field shot with a Sky Watcher 80ED f7.5 telescope and QHY8 astronomical camera + UHC-s filter. Total exposure time ~3,5h
  4. Last image was shot with a Meade LX200 GPS 12" telescope @ f6,5 and a QHY8, a cooled astronomical camera with a H-alpha and UHC-s filters. Total exposure time ~7h.

1 comment:

Skywatcher said...

Great pitchers loved them.first time i got so clear view of them.