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Wednesday, February 17, 2010

Planetary Nebula in Constellation Lynx

Nebula in a HST-palette (Hubble Space Telescope)
Red=S-II, Green=H-alpha and Blue=O-III

Nebula in natural colors from same material as a HST-image. Narrowband channels are mixed to match visible spectrum. Red=80% H-alpha+20% S-II, Green=O-III and Blue=80% O-III+20% H-alpha to compensate otherwise missing H-beta.

Finally, after a long period of bad weather, I was able to shoot more H-a, O-III and S-II channels.
Seeing was not too bad but the transparency was very poor. This is an object with a very low surface brightness and bad transparency eated out some signal.

Due the low brightness this objet is not commonly imaged, even though it has a largish angular diameter to a planetary nebula. (6'.67" x 6'.67")

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 @ 9Hz
Image Scale, 1,5 arcseconds/pixel
H-alpha 14x1200s, binned 2x2 and 7x1200s, binned 3x3 
O-III 2x600s, binned 4x4 and 1x1200s, binned 4x4
S-II 3x600s, binned 4x4 and 1x1200s, binned 4x4

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