Thursday, August 25, 2011
APOD
![[nasa-large.jpg]](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhnPTKmnidt6gHuVkChO_MPYTqp2lSu-Tr0If3ey1qfJxF9BJpDhG8wIWnxo86hb3vT5OYKiznVUminjBaRRat99o70A1ODvDjHEDHpKGWYCsnjn-WFYunaGVPsfXiizriH0upX9hbpNWs/s1600/nasa-large.jpg)
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My Image of the "Pac man Nebula", NGC281, was selected as an "Astronomy Picture of the Day" by the NASA.
You can see the NASA page here: http://apod.nasa.gov/apod/ap110825.html
You can see the NASA page here: http://apod.nasa.gov/apod/ap110825.html
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This was my Fourth APOD, previous ones can be seen here:
Potrait of NGC281
Original blog post, with the technical details and more images, can be seen here:
Wednesday, August 24, 2011
NGC 1499, the "California Nebula" reprocessed, ones again...
I did reprocessed this nebula since my skills are much better now, than two years ago.
All the exposures I have taken for this object are used. Total exposure time is over 20h together for all three channels, Ionized Sulfur, Hydrogen and Oxygen. Two camera lenses was used to capture the data, a Tokina AT 300mm f2.8 and a Canon EF 200mm f1.8, both lenses was used at full aperture.
NGC 1499, in Perseus
Ra 04h 03m 18s Dec +36° 25′ 18″
This object has a very large angular scale, as can be seen in a last image in this page.
It has a lowish surface brightness too, hence 20h of exposures, with fast optics, was needed.
California nebula located in constellation Perseus at distance of ~1000 light years.
California nebula located in constellation Perseus at distance of ~1000 light years.
R=Sulfur, G=Hydrogen and B=Oxygen.
Apparent scale in a sky
This is a large object, note, the size of the Moon is marked, as a scale, in all of the images above.
The Wikipedia article states, that the angular size is about 2,5 degrees (Five full Moons side by side)
but as can be seen in this image, the actual size, with a dim outer parts, is much large.
Experimental 3D-studies of NGC1499 can be found in my portfolio, in different formats.
Please, have a look here:
http://astroanarchy.zenfolio.com/f359296072
The Wikipedia article states, that the angular size is about 2,5 degrees (Five full Moons side by side)
but as can be seen in this image, the actual size, with a dim outer parts, is much large.
Experimental 3D-studies of NGC1499 can be found in my portfolio, in different formats.
Please, have a look here:
http://astroanarchy.zenfolio.com/f359296072
Previous reprocessed version can be seen here:
Sunday, August 14, 2011
Rosette Nebula, apparent scale in a sky, horizontal edition in two palettes
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.
"Rosette Nebula"
Ra 06h 33m 45s Dec +04° 59′ 54″, 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.
Information about the Rosette Nebula
The Rosette Nebula (also known as Caldwell 49) is a large, circular H II region located near one end of a giant molecular cloud in the Monoceros. The open cluster NGC 2244(Caldwell 50) is closely associated with the nebulosity, the stars of the cluster having been formed from the nebula's matter. The cluster and nebula locates at a distance of about 5,200 light years from Earth. The diameter is about 130 light years.
The radiation from the young stars ionized the atoms in the nebula, causing them to emit light, typical to each element, producing the visible nebula. Stellar winds, radiation pressure, from a group of stars cause compression to the interstellar clouds, followed by star formation in the nebula. This star formation is currently still ongoing.
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.
1. Two panel mosaic of Cone and Rosette Nebulae. Shot with a Canon EF 200mm f1.8 lens, Baader NB-filters and QHY9 cooled astronomical camera.
2. The Rosette half of the mosaic image.
3. Rosette Nebula with a Tokina AT-X 300mm f2.8 lens, Baader NB-filter set and QHY9 astro camera.
4. Rosette closeup with Meade LX200 GPS 12" 2000mm, NB-filters and QHY9 camera.
Technical details for all of the images above, can be found in my portfolio:
http://astroanarchy.zenfolio.com/
Vertical versions can be seen here:
and here:
Saturday, August 13, 2011
Bubble Nebula, apparent scale in the sky, horizontal editions
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″
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.
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.
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)
If you are interested about color schemes used in my images, I wrote a small study about them, please, have a look here: http://astroanarchy.blogspot.com/2009/11/colors-in-astro-images.html
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 Left to Right
- 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.
Vertical versions can be seen here:
and
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