Saturday, January 25, 2014
A zoom in series of the Cave Nebula, Sh2-155
Now and then I have published some zoom in series of various objects imaged by me.
The purpose is to show the apparent scale in the sky. Beside that, this series shows nicely the fractal nature of our universe. Series are possible to make, since I have shot many objects with various focal lengths.
Like this one is shot with 200mm, 300mm and ~2000mm focal lengths
The Cave Nebula, a study about the scale in the sky
Note. A circle, size of the Moon, in the images as a scale. (An apparent scale of the Moon is 0,5 degrees, or 30 arc minutes.)
Note. A circle, size of the Moon, in the images as a scale. (An apparent scale of the Moon is 0,5 degrees, or 30 arc minutes.)
All images are in Mapped colors from the emission of ionized elements,
R=Sulfur, G=Hydrogen and B=Oxygen.
Orientation in constellation Cepheus
An orientation in constellation Cepheus. The mosaic image covers an area of ~18x10 dgrees.
Friday, January 24, 2014
A new header image, Oxygen emission of the Eastern Veil nebula
I have added a new header photo. It shows a small portion of the Veil Nebula supernova remnant in Cygnus. Image shows the Eastern veil but only in light emitted by ionized Oxygen, O-III.
I have published this image at January 7 this year. A blog post about it can be seen HERE.
An emission of ionized Oxygen in Eastern Veil Nebula.
The Veil nebula SNR
This is an image about the whole Veil Nebula. A blog post about this image can be seen HERE
A detail image above can be seen at left edge of the image bellow. Click for a large image.
Thursday, January 23, 2014
A supernova remnant in Cygnus (Not a Veil nebula) reprocessed
I found six hours of unused H-a data, for this SNR, from my hard drive! Now the dim background emission of an ionized hydrogen is in balance with O-III emission of supernova remnant. The overall look and feel of the image is much natural, I think.
This is a rarely imaged target. I haven't been able to find an other color image of it, showing the whole supernova remnant. This is also one of the most difficult targets, I have ever shot. Due to a very dense star field, large angular dimension and a very diffused structure this is even more difficult target, than a Simeis 147 supernova remnant in Taurus. Total exposure time of 38h was needed to have this image.
This is a rarely imaged target. I haven't been able to find an other color image of it, showing the whole supernova remnant. This is also one of the most difficult targets, I have ever shot. Due to a very dense star field, large angular dimension and a very diffused structure this is even more difficult target, than a Simeis 147 supernova remnant in Taurus. Total exposure time of 38h was needed to have this image.
G65.3+5.7 SNR has about the same angular dimensions, than brighter and more famous remnant in Cygnus, the Veil Nebula. The angular dimensions are about 3x4 degrees.
NOTE, this image is updated at 20.01.2014. There is now a better H-a channel and the background is practically full of ionized Hydrogen, H-alpha.
NOTE, this image is updated at 20.01.2014. There is now a better H-a channel and the background is practically full of ionized Hydrogen, H-alpha.
G65.3+5.7 SNR, reprocessed with extra H-a data
A supernova remnant in constellation Cygnus
So many stars...
Orientation
Technical details
Technical details
Processing work flow:
Image acquisition, MaxiDL v5.07.
Stacked and calibrated in CCDStack2.
Deconvolution with a CCDStack2 Positive Constraint, 33 iterations, added at 33% weight
Levels, curves and color combine in PS CS3.
Optics, Canon EF 200mm camera lens at f1.8
Camera, QHY9
Guiding, Meade LX200 GPS 12" and a Lodestar guider
Image Scale, ~5 arcseconds/pixel
H-alpha, 69x1200s = 23h
O-III, 45x1200s = 15h
Total exposure time 32h
A single calibrated and stretched 20min O-III frame
O-III is the stronger channel!
Heavily stretched 1200s frame of the strongest channel, ionized Oxygen (O-III), doesn't show much.
O-III, 45x1200s = 15h
Total exposure time 32h
A single calibrated and stretched 20min O-III frame
O-III is the stronger channel!
Tuesday, January 21, 2014
Sh2-221, a supernova remnant in Auriga
I think, this is the first three band color image, showing the whole Sh2-221, in the World.
This was one of the most difficult targets I have done so far. Supernova remnant Sh2-221, SNR G160.4+02.8, HB9, locates in constellation Auriga and has an angular dimensions about 2.5 x over 3 degrees. I never seen or red about the extended ionized Oxygen area, visible in my image as blue.
About 33h of exposures with extremely fast camera optics, Canon EF 200mm f1.8 @f1.8, was needed for this image. Total exposure time for the mosaic image, with a Planetary Nebula Sh2-216, is about 58h.
This could be the very first narrow band color image in the world out of this target. Generally, there are very few images of it. I couldn't find an other image showing the whole remnant nor other channels, than H-a.
I have shot this area before but at the time part of the Sh2-221 was missing. This new image of mine is much more accurate and deep.
I have shot this area before but at the time part of the Sh2-221 was missing. This new image of mine is much more accurate and deep.
Sh2-221, Sh2-221, SNR
A supernova remnant in Auriga, Ra 04 43 21 Dec 46 42 06Mapped colors
Mapped colors from the emission of ionized elements,
R=Sulfur, G=Hydrogen and B=Oxygen.
Buy a photographic print from HERE
Visual spectrum
Image is in Natural color palette from the emission of ionized elements,
The Supernova remnant Sh2-221 (SNR G160.4+02.8, HB9) locates in constellation Auriga, about one degree West from Capella. (Doesn't show in my image) The distance from the Earth, 2600 light years, is determined recently at 2007. This object was recognized as a supernova remnant back at seventies.
A two panel mosaic image of Sh-221 and Sh2-216
Two ways to end a life of the star in a same seven degrees field of view!
Just next to Sh2-221 locates a closest known planetary nebula, Sh2-216. This is also a very rarely images target, due to its low surface brightness and large angular dimension. This mosaic image covers over seven degrees of sky vertically. (The Moon has an apparent dimension of 0.5 degrees.) Mosaic is made out of my new data of Sh2-221 and an older material of Sh2-216. Some new exposures was taken for the Sh2-216 to match the background for a mosaic image.
Image shows two different ways to end a life of the star. At left, as a Supernova and at right as a Planetary Nebula. (Massive stars will go to a Supernova, after burning out all of the Hydrogen. There will be a Neutron star or a Black Hole left behind. Lighter stars, as our Sun, will turn to a Planetary Nebula, after ran out of Hydrogen. There is a core of the star left behind, it's called a White Dwarf and it will cool down gradually. )
Mapped colors
Mapped colors from the emission of ionized elements,
R=Sulfur, G=Hydrogen and B=Oxygen.
Buy a photographic print from HERE
Visual spectrum
Image is in Natural color palette from the emission of ionized elements,
R=Hydrogen + Sulfur, G=Oxygen and B=Oxygen + Hydrogen.
Buy a photographic print from HERE
Buy a photographic print from HERE
A labeled image
Orientation in Auriga
Technical details
Processing work flow:
Image acquisition, MaxiDL v5.07.
Stacked and calibrated in CCDStack2.
Deconvolution with a CCDStack2 Positive Constraint, 33 iterations, added at 50% weight
Levels, curves and color combine in PS CS3.
Optics, Canon EF 200mm camera lens at f1.8
Camera, QHY9 with the Baader narrow band filter set, H-a, S-II and O-III
Guiding, Meade LX200 GPS 12" and a Lodestar guider
Image Scale, ~5 arcseconds/pixel
Exposures for the Sh2-221 SNR
H-alpha: 51 x 1200s = 17h
O-III: 21 x 1200s = 7h
S-III: 27 x 1200s = 9h
Exposures for the Sh2-216 Planetary Nebula
H-alpha: 30 x 1200s = 10h
O-III: 18 x 1200s = 6h
S-III: 27 x 1200s = 9h
Total exposure time 58h
Animation of the narrow band channels
In this animation each color channel of Sh2-221 is shown separately. A special technique of mine, Tone Mapping, was used to dig out some extremely dim data.
A set of individual 20 min. exposures for used channels.
Note.
Images are calibrated with Bias corrected Flats and Darks. A very strong none linear stretching is performed to the images. A hint of the Planetary Nebula Sh2-216 can be seen at most right.
H-alpha, the light emitted by an ionized Hydrogen
S-II, the light emitted by an ionized Sulfur
O-III, the light emitted by an ionized Oxygen
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