Monday, September 27, 2010
Sh2-142, the "Wizard Nebula"
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.
I use a starless image in one of the processing steps. Sometimes I publish it, since the actual nebula can be better seen by this way.
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.
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.
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.
Technical details for image used for colors:
Sunday, September 26, 2010
NGC 2070, the "Tarantula Nebula"
NGC 2070 in HST-palette, (HST=Hubble Space Telescope)
from the emission of ionized elements, R=Sulfur, G=Hydrogen and B=Oxygen.
This composition is very close to a visual spectrum.
Tarantula nebula, NGC 2070, also known as 30 Doradus, is an ionized Hydrogen region in the Large Magellanic cloud, visible in southern hemisphere. Distance from Earth is about 160.000 light years.
A closeup of Tarantula Nebula
The telescope and technical information:
16" RCOS ja Apogee U9000 camera.
LRGB combo.
H-alpha 5x1200s, Dark and artificial Flat calibrated.
2 x O-III 1200s and 5 x 900s Dark and artificial Flat calibrated.
2 x S-II 1200s, Dark and artificial Flat calibrated.
Raw data is shared with "Team Finland"
Processing workflow:
Image acquisition, MaxiDL v4.xxx
Stacked and calibrated in CCDStack.
Deconvolution with a CCDSharp, 30 iterations added 50% to non convoluted data
Levels, curves and color combine in PS CS3.
Tuesday, September 21, 2010
NGC 7380 and the "Wizard Nebula", start of the new project
NGC 7380, Sh2-142 , the "Wizard Nebula", locates in constellation Cepheus about 7000 light years from Oulu, Finland. The open star cluster has a catalog number NGC 7380. It's a relatively young cluster, about 5 million years. Nebula spans some 110 light years.
There is only 1h 20 min. H-a light for the object, due some technical problems. Ones again, I spend most of the night by fixing my ***** scope.
Seeing was better than usually, FWHM about 2,5".
Seeing was better than usually, FWHM about 2,5".
I'll shoot much more H-alpha data and other NB channels, S-II and O-III later.
Image is very noisy due the short exposure time.
Image is very noisy due the short exposure time.
Technical details:
processing work flow:
Image acquisition, MaxiDL v5.07.
Stacked and calibrated in CCDStack.
Levels and curves in PS CS3.
Telescope, Meade LX200 GPS 12" @ f5
Camera, QHY9 Guiding, SXV-AO @ 6Hz
Image Scale, 0,75 arcseconds/pixel
Exposures H-alpha 4x1200s, binned 1x1
Monday, September 20, 2010
NGC 7000 closeup, HST-palette preview
NGC 7000 in HST-palette from the emission of ionized elements, R=Sulfur, G=Hydrogen and B=Oxygen.
This is kind of preview image, since HST-palette colors are borrowed from an older, wide field image of North America nebula. I'll shoot new, high resolution, color channels for O-III and S-II, when ever weather up here allows me to do so.
Technical details for the older image, from 2008, can be found here: http://astroanarchy.blogspot.com/2008/09/my-first-ever-narrowband-color-image.html
(This is actually my first ever narrow band color image!)
Colors are taken from this image of North America and Pelican nebulae.
More "Monitor friendly" orientation.
Technical details for closeup:
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 @ 6Hz
Image Scale, 0,75 arcseconds/pixel
Exposures H-alpha 15x1200s, binned 1x1=5h
O-III 1x1200s binned 3x3
Technical details for wide field image:
-
NOTE
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 @ 6Hz
Image Scale, 0,75 arcseconds/pixel
Exposures H-alpha 15x1200s, binned 1x1=5h
O-III 1x1200s binned 3x3
Technical details for wide field image:
Tokina AT-X 300mm f2.8 manual focus lens.
This is a very modest example of three colur narrowband image. But I place it here, since it's my first one. At 11.09. I mainly shoot H-alpha, but before clouds rolled in I managed to capture 4 x 900s O-III and only single shot of S-II, 900s. I will shoot more O-III and S-III when ever weather allows me to do so. In this image the "Hubble paletete" is used where S-II = Red, H-alpha = Green and O-III = Blue-
NOTE
This image is taken by using QHY8 cooled 6.1mb color camera. Its not an ideal tool for narrowband imaging.
Each color channel is shooted trough separate filter, this means, that only 1/4 pixels are used for H-alpha and S-II. O-III goes mainly to the Green and Blue pixels of the Bayer matrix array, so about 3/4 of the pixels are used in this case. How ever, very high quality narrowband images has been taken by using color cameras.
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