Saturday, September 29, 2012
Two panel mosaic from the Butterfly to Crescent Nebula
Butterfly and Crescent Nebulae in constellation Cygnus
Image is in mapped colors, from the emission of ionized elements, R=Sulfur, G=Hydrogen and B=Oxygen.
The colorful "noise" at background is not a noise but countless number of stars!
This is a part of the much large, 18-panels, mosaic of constellation Cygnus, it can be seen HERE.
Image is shot at Autumn 2011, I'm publishing this here, since I have reprocessed the color data.
Image is shot with Canon EF 200mm f1.8 optics, full open, QHY9 cooled astronomical camera and the Baader narrowband filter set. (H-a. O-III and S-II) Esposure times, about two hours per channel, total six hours.
Shooting with f1.8 optics is kind of extreme, the critical focus zone is only 7 microns (7/1000mm).
Focusing and staying in focus is really difficult at that speed, one quarter of the degrees temperature drop is enough to destroy focus. I have build a temperature compensating automatic focusing system for camera lenses. ( http://astroanarchy.blogspot.fi/2008/09/new-equipmets-and-some-development-work.html )
A closeup image of the Crescent Nebula,
it can be seen at center of the image above
Image is 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.
This image was selected as an APOD, Astronomy Image Of the Day, by the NASA.
Thursday, September 27, 2012
A scale study of the Veil Nebula supernova remnant
Many times, it's difficult to understand the image scale of astronomical images.
Therefore I have added a "Moon circle" in the images to show the angular scale in the sky. The full Moon has an angular size of ~30 arc minutes, that's equal to ~0,5 degrees.
A new scale study, the Veil Nebula
Note. The apparent size of the Moon is marked as a white circle for a scale.
Images used in this series:
Two images at top are shot with the Canon EF 200mm f1.8 camera lens and QHY9 astronomical camera with the narrowband filters:
Images at middle are shot with SkyWatcher 80 ED telescope at ~700mm focal length:
http://astroanarchy.blogspot.fi/2010/04/eastern-part-of-veil-nebula-as-stereo.html
Image at bottom is shot with Meade LX200 GPS 12" telescope at ~f5:
http://www.astroanarchy.blogspot.fi/2012/09/ic-1340-project-as-bi-color-from.html
Tuesday, September 25, 2012
IC 1340 project as a bi-color from hydrogen and oxygen
IC 1340, Part of the Eastern Veil Nebula in Cygnus
RA: 20h56m 45.8s DE:+31 degrees07' 17"
Colors are mixed R=H-a, G=O-III and B=O-III + 5%H-a
An experimental starless version to show the actual nebula better
An animation to show difference between H-alpha and O-III emissions
Hydrogen and the Oxygen are clearly separated
Orientation image
Area of interest is marked as a white rectangle in this older wide field image above.
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
Image Scale, ~0,8 arc-seconds/pixel
16 x 1200s exposures for H-alpha emission = 5h 20min.
12 x 1200s exposures for O-III, emission of ionized oxygen = 4h
IC 1340 in Eastern Veil Nebula. Image shows a starless version of pure ionized Oxygen, exp. time ~5h.
This is a second version of this photograph. It looks like an electric version of the Nike statue!
Ps.
I made an animation about different components in my image.
In this animation, allthe components in my image of IC 1340 are separated.
Looks odd but it's very useful while processing the image, since operations can be done to single element in image without interfering other image components.
NOTE. There is absolutely zero data lost in this technique due to my processing method.
I'm using a "difference mapping" between images and all the removed components gets placed back byte by byte in final image!
Monday, September 24, 2012
First project, IC 1340, of Autumn 2012 continues
The weather hasn't been on my side. At four nights, I have managed to collect about three two hours set of Hydrogen alpha light exposures. Now there is more details and less noise, than in previous two hours version.
I'll shoot other channels, ionized Oxygen and Sulfur, for the color image, as soon as the weather cooperates again.
IC 1340, Part of the Eastern Veil Nebula in Cygnus
RA: 20h56m 45.8s DE:+31 degrees07' 17"
A closeup
IC 1340 is part of the Veil Nebula, a supernova remnant in constellation Cygnus at distance of about 1470 light years. This is one of the more luminous areas in this SNR. Image is B&W, since it shows only a light emitted by ionized Hydrogen. The shock front formed by the material ejected from giant explosion, the super nova, can be seen in this image.
There is only two hours of exposures integrated in this image. I'll need least three more hours for H-alpha and about a same amount for O-III and S-II to make a color composition out of this target.
There is only two hours of exposures integrated in this image. I'll need least three more hours for H-alpha and about a same amount for O-III and S-II to make a color composition out of this target.
Orientation image
Area of interest is marked as a white rectangle in this older wide field image above.
Technical details:
Processing work flow:
Image acquisition, MaxiDL v5.07.
Stacked and calibrated in CCDStack2.
Levels and curves in PS CS3.
Optics, Meade LX200 GPS 12" @ f5
Camera, QHY9
Guiding, SXV-AO, an active optics unit, and Lodestar guide camera
Image Scale, ~0,8 arc-seconds/pixel
16 x 1200s exposures for H-alpha emission = 5h 20min.
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