Sunday, June 13, 2010
Start of a new imaging project, the Helix nebula
The Helix nebula, NGC 7293. Planetary nebula in constellation Aquarius about 700 light years from the Earth..
(The helix has been often referred to as the "Eye of Good",
I'll like to know, which one it's supposed to belong... least we know now He/She has very large Blue eye(s).)
This is a start for an imaging project, since the Helix has lowish surface brightness, it'll need a long integration time. Now there is just One hour used for the Luminance channel and 10 min./each RGB-channel.
I think, about Five to ten hours is needed to reveal dimmer outer parts of this Planetary nebula.
Later we'll shoot all the narrow band channels, H-a, O-III and S-II, too.
The telescope and technical information:
16" RCOS ja Apogee U9000 camera.
LRGB combo.
Luminance 6x600s., Dark and Flat calibrated.
Red 1x600s, Dark calibrated
Green 1x600s, Dark calibrated
Blue 1x600s, Dark calibrated
Raw data is shared with Petri Kehusmaa and J-P Metsavainio
Processing workflow:
Image acquisition, MaxiDL v4.xxx
Stacked and calibrated in CCDStack.
Deconvolution with a CCDSharp, 30 iterations
Levels, curves and color combine in PS CS3.
Saturday, June 12, 2010
M8, LRGB, second edition
M8, LRGB image redone.
Previous version and technical details can be seen here:
M8, the "Lagoon nebula" in H-alphaLR(H-alpha)GB composition
GB.jpg)
H-alpha boosted LRGB image of M8.
H-alpha emission of ionized Hydrogen is mixed to a LRGB image.
50% H-a to Red channel in "lighten" mode and 33% H-alpha mixed to a luminance channel.
The telescope and technical information:
16" RCOS ja Apogee U9000 camera.
LRGB combo.
Luminance 7x300s., Dark and Flat calibrated.
H-alpha 4x1200s, Dark and Flat calibrated.
Red 5x300s, Dark calibrated
Green 5x300s, Dark calibrated
Blue 5x300s, Dark calibrated
Raw data is shared with Petri Kehusmaa and J-P Metsavainio
Processing workflow:
Image acquisition, MaxiDL v4.xxx
Stacked and calibrated in CCDStack.
Deconvolution with a CCDSharp, 30 iterations
Levels, curves and color combine in PS CS3.
Different color versions:
Pure LRGB-composition.
H-alpha
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.
HST-palette from the emission of ionized elements, R=Sulfur, G=Hydrogen and B=Oxygen
More information of used color schemes:
M8, the "Lagoon nebula" as a LRGB-broad band image
M8, pure LRGB-composition.
The telescope and technical information:
16" RCOS ja Apogee U9000 camera.
LRGB combo.
Luminance 7x300s., Dark and Flat calibrated.
Red 5x300s, Dark calibrated
Green 5x300s, Dark calibrated
Blue 5x300s, Dark calibrated
Raw data is shared with Petri Kehusmaa and J-P Metsavainio
Processing workflow:
Image acquisition, MaxiDL v4.xxx
Stacked and calibrated in CCDStack.
Deconvolution with a CCDSharp, 30 iterations
Levels, curves and color combine in PS CS3.
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