Monday, January 24, 2011
NGC 6888, the "Crescent Nebula" wide field reprocessed
Since my processing technique gets better and weather doesn't give any support, I have reprocessed some older images. There is now star colors added and other processing is tweaked too.
NGC 6888 as a wide field image
Ra 20h 12m 7s Dec +38° 21′ 3"
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.
The Crescent Nebula, also known as NGC 6888, Caldwell 27 and Sharpless 105, is an emission nebula in constellation Cygnus, about 5000 light years distance.
It is formed by the fast stellar wind from the Wolf-Rayet star, WR 136 (HD 192163), colliding to an slower moving wind ejected by the same star when it became a red giant, around 400.000 years ago.
The result of the collision is a glowing shock shell around the star. Apparen size of the shell is 18' x 12' and the real size is about 25 x 16 light years.
This image covers about three degrees horizontally. (Area of six full Moons side by side)
Image is shot with a QHY8 and the Tokina AT 300mm f2.8 lens at full aperture.
Original versions from November 2008, with technical details:
A closeup image of the Crescent Nebula
This image is shot with a much longer focal length, about 2000mm, with a Meade LX200 GPS 12", Baader narrowband filters and a QHY9 astronomical camera. Image is in HST-palette.
Sh2-155, the "Cave Nebula", reprocessed
Since my processing technique gets better and weather doesn't give any support, I have reprocessed some older images. There is now star colors added and other processing is tweaked too.
Sh2-155, the "Cave Nebula" as a wide field image
Ra 22h 57m 17.14s Dec +62° 28′ 33.4"
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.
The Cave Nebula, Sh2-155 or Caldwell 9 is a very diffuse nebula within a larger nebula complex containing emission, reflection, and dark nebulosity. It is located in the constellation Cepheus.
The reflection, wide band, component can't be seen in my image, since this is a narrowband one.
Distance is about 2400 light years.
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.
Image is shot with a QHY8 and the Tokina AT 300mm f2.8 lens at full aperture.
Original versions from October 2008, with technical details:
Sh2-155, the "Cave Nebula", as a Stereo Pair 3D
Parallel vision 3D
Cross vision 3D
Other 3D-formats:
Original 2D:
NOTE! This is a personal vision about forms and shapes, based on some known facts and an artistic impression.
Sunday, January 23, 2011
The "Elephant's Trunk Nebula", inside IC 1396, reprocessed
Since my processing technique gets better and weather doesn't give any support, I have reprocessed some older images. There is now star colors added and other processing is tweaked too.
IC 1396 and the "Elephant's Trunk Nebula"
In constellation Cepheus
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.
The elephant's Trunk nebula is a concentration of interstellar gas and dust in the star cluster IC 1396.
This ionized gas region locates in the constellation Cepheus about 2400 light years away.
Formation is coursed by a stellar wind, radiation pressure, from a group of massive young stars.
This image shows the location in large context
Image area is about three degrees wide. (Six full Moons side by side)
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.
Original versions from October 2009, with technical details:
Real RGB-colors with a H-alpha luminance boost. RGB-colors are shot at 2008 with a QHY8 color camera and the UHC-s filter.
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