Friday, January 11, 2013
NGC 1491, the project finalized
I was able to finalize this imaging project since I found an older wide field color image of mine from this area.
I used colors from this wider field image and it seems to work fine. naturally the resolution is much lower in other than H-alpha channel but it doesn't harm the image too much since there are not much details in O-III and S-II channels in this case.
NGC 1491
in constellation Perseus
Colors are mapped to a HST-palette, R=Sulfur, G=Hydrogen and B=Oxygen
Click for a large image.
INFO
NGC 1491 is an emission nebula, in the constellation Perseus, at the distance of about 10700 light years. The ultraviolet light from the newly born stars makes elements in the nebula glow. There is an an 11th magnitude star in its center. The solar wind, a radiation pressure, from the central star is blowing a bubble in the gas surrounding it. This is a dim one, seven hours of exposures was barely enough to reveal it.
A closeup
NGC 1491 in natural colors
Combined from the emission lines of H-a, S-II and O-III
A wide field image
Shot at Spring 2012
The large nebula at center is Sharpless 205 (Sh2-205), NGC 1491 can be seen at upper left corner..
Some info about the wide field image
This Sharpless object is very dim and difficult to shoot (as they usually are). The bright, peanut shape, area at middle is known as Sh2-205, bright nebula, at top left, is NGC 1491. Image spans about 5,5 degrees horizontally, that's 11 full Moons side by side. There are very few images around out of this object. Total exposure time, with a fast 200mm f1.8 optics, is 12h from three nights between 28.01 - 02.02. 2012.
Technical details:
Processing work flow:
Image acquisition, MaxiDL v5.07.
Stacked and calibrated in CCDStack2.
Levels, curves and color combine in PS CS3.
Optics, Meade LX200 GPS 12" @ f5
Camera, QHY9
Guiding, SXV-AO, an active optics unit, and Lodestar guide camera 5Hz
Image Scale, ~0,8 arc-seconds/pixel
21 x 1200s exposures for the H-alpha, emission of ionized Hydrogen = 7h
Color channels for O-III and S-II are from an older wide field image.
Ps.
A popular shape in our local universe
While processing the image, I noticed a familiar shape in the center portion of the image.
It seems to repeat itself in various targets. My guess is, that it's coursed by the solar wind from the open cluster usually locates in center of the emission nebula of this type.
A collection of targets with same type of shapes as can be seen in center of the this new image.
The top most two images are from NGC 1491.
Tuesday, January 8, 2013
An emission nebula NGC 1491
A start of the new imaging project.
I'll shoot other two emission channels, needed for a color image, as soon as the weather allows.
NGC 1491
in constellation Perseus
NGC 1491 in H-alpha emission light
INFO
A closeup
A detail from the center of the image above
A popular shape in our local universe
While processing the image, I noticed a familiar shape in the center portion of the image.
It seems to repeat itself in various targets. My guess is, that it's coursed by the solar wind from the open cluster usually locates in center of the emission nebula of this type.
A collection of targets with same type of shapes as can be seen in center of the this new image.
The top most two images are from NGC 1491.
Technical details:
Processing work flow:
Image acquisition, MaxiDL v5.07.
Stacked and calibrated in CCDStack2.
Levels, curves and color combine in PS CS3.
Optics, Meade LX200 GPS 12" @ f5
Camera, QHY9
Guiding, SXV-AO, an active optics unit, and Lodestar guide camera 5Hz
Image Scale, ~0,8 arc-seconds/pixel
21 x 1200s exposures for the H-alpha, emission of ionized Hydrogen = 7h
An experimental starless image
A starless image to show only the actual nebula
Wednesday, January 2, 2013
Melotte 15 as an experimental 3D-study
I have done several 3D-studies out of my astronomical images. Models are based on some known scientific facts and an artistic impression. This is an approximation to the real structure of the nebula, an educated guess, it gives a feel to the object and an idea, what it must really be like.
There are several 3D-modes to see from the same material. Animated 3D, free view stereo pairs and an anaglyph Red/Cyan 3D.
There are several 3D-modes to see from the same material. Animated 3D, free view stereo pairs and an anaglyph Red/Cyan 3D.
An animated 3D-study of Melotte 15
Please, let the animation load to see a smooth movement
There are nothing else used than a real image elements from the original 2D-shot!
An original image used for the 3D-model
http://astroanarchy.blogspot.fi/2012/12/melotte-15-in-ic-1805-project-finalized.html
An other version of the animated 3D
An experiment with a zoom effect
Free view stereo pairs
Viewing instructions
For a Parallel Vision method
For a Cross Vision method
An anaglyph Red/Cyan 3D
Pair of Red/Cyan eyeglasses are needed to see this 3d-image!
(Red and Blue filters will do the trick, red goes to left eye.)
Ps.
All my 3D-studies, stereo pairs and an anaglyph 3D, can be found here:
Animated versions are here:
Astro Anarchy gets published, a public Slide Show
My works are selected as a public content for a pedestrian zone in my home town Oulu, Finland.
There is a very large display unit at the end of the zone, 5.12 x 3.2 meters (over 16 x 10 feet). Five different sets of my astronomical photographs are running there as a slide show at January 2013.
Astronomical images in a giant public display
January 2013
All my images can be seen in my portfolio, please have a look:
http://astroanarchy.zenfolio.com/
Subscribe to:
Posts (Atom)
