Wednesday, July 20, 2011
Sh2-142, the "Wizard Nebula" reprocessed
Since my processing technique gets better and the time of year doesn't give any support for new images, I have reprocessed some older ones. There is now star colors added, other processing is tweaked too.
NGC 7380, the "Wizard Nebula", in Cepheus
Ra 22h 47m 0s Dec +58° 06′ 00″
Sh2-142 alias NGC 7380, in HST-palette, (HST=Hubble Space Telescope)
from the emission of ionized elements, R=Sulfur, G=Hydrogen and B=Oxygen.
NGC 7380 is a catalog number of the open star cluster inside Wizard nebula, SH2-142.
Nebula locates in constellation Cepheus, about 7000 light years from my home.
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.
Original processing can be seen from here:
A study about an apparent scale in a sky
An experimental starless image to show some details in the actual nebula
Technical details:
Processing work flow:
Image acquisition, MaxiDL v5.07.
Stacked and calibrated in CCDStack.
Deconvolution with a CCDSharp, 30 iterations.
Levels, curves and color combine in PS CS3.
Telescope, Meade LX200 GPS 12" @ f5
Camera, QHY9 Guiding, SXV-AO @ 6,5Hz
Image Scale, 0,75 arcseconds/pixel
Exposures H-alpha 15x1200s, binned 1x1
S-II 1x1200s, binned 4x4
O-III 1x1200s, binned 4x4
I have used color data from an older, 2008, wide field image of Sh2-142.
Monday, July 18, 2011
The "Crescent Nebula", NGC6888, 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.
NGC 6888, the "Crescent Nebula"
Ra 20h 12m 7s Dec +38° 21′ 3", in Cygnus
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.
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.
This is a second version. First one, as a Hubble palette composition, can be found here:
http://astroanarchy.blogspot.com/2011/05/crescent-nebula-ngc6888-apparent-scale.html
This is a second version. First one, as a Hubble palette composition, can be found here:
http://astroanarchy.blogspot.com/2011/05/crescent-nebula-ngc6888-apparent-scale.html
Images used in the series above, from top to bottom
1. Three panel mosaic of the "Cygnus Trio", Tokina AT-X 300mm f2.8 camera lens.
2. Two panels from a mosaic above, Tokina AT-X 300mm f2.8 camera lens.
3. wide field image of NGC6888 was shot with a Tokina AT-X 300mm f2.8 camera lens.
4. Closeup images, at the bottom are shot with a Meade LX200 GPS 12" reduced ~2000mm.
Baader narrowband filter set was used with all of the images, wide fields are shot with a QHY8 and closeup with QHY9 cooled astronomical camera.
Original images used for image series can be found here:
The "Bubble Nebula", in Hubble palette, 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.
Sharpless 162, NGC 7635, the "Bubble Nebula"
Ra 23h 20m 48s Dec +61° 12′ 06″
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.
NOTE. The size of the full Moon (0,5 degrees) is marked as a gray circle in all of the images.
A scale study of the "Bubble Nebula", in natural color composition, can be seen here:
Images used in the series above from top to bottom
- A wide field mosaic from the Bubble and Sharpless 157 to the Wizard Nebula at Right. Images are taken with a Tokina AT-X 300mm camera lens.
- A Sh2-157 and Bubble Nebula part of the mosaic, Tokina AT-X 300mm
- Zoomed in version from the previous image
- A close up of the Bubble Nebula imaged with a Meade LX200 GPS 12" telescope, focal lenght ~2000mm.
- A zoomed in version of image above.
This is one of the most interesting looking structures in the sky!
NGC 7635 aka "Bubble Nebula, Sh2-162 or Caldwell11, is a Hydrogen emission nebula in constellation Cassiopeia. It locates near the open cluster M 52 at distance of about 11.000 light years from the Earth.
The bubble structure is created by a strong stellar wind, a radiation pressure, from massive hot magnitude 8,7 central star, SAO 20575, it can be seen in an image inside of the bubble, off centered at Right.
Bubble is an expanding shock front inside a giant molecular cloud and it has a diameter more than Six light years. The spherical formation is expanding at speed of 6500.000 km/h, due the huge scale and distance we can't see the movement easily. In a century, the bubble in this image will be only about one pixel wider, than now! ( ~1 arc second)Strong UV-radiation from a central star ionized elements in a gas and makes them glow at typical wavelength to each element. (Hydrogen glows Red light as Sulfur, Oxygen emits Green/Blue light at visible wavelengths)
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.
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
- 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.
- A zoomed in version of previous image
- 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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