Sh2-234, IC417, sometimes called as "Spider Nebula", in constellation Auriga. H-alpha 22x1200s, binned down 2x2 to boost the sensitivity. 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.



Distance is about 10.000 light years. Image is about 30' wide and covers about 100 light years. Ra 05 hr 28 min 05.9 sec , Dec +34 hr 25 min26 sec

Technical details:

Processing work flow:

Image acquisition, MaxiDL v5.07.

Stacked and calibrated in CCDStack.

Deconvolution with a CCDSharp, 30 iterations, 50% mix.

Levels, curves and color combine in PS CS3.



Telescope, Meade LX200 GPS 12" @ f5

Camera, QHY9 Guiding, SXV-AO @ 4,5Hz

Image Scale, 0,75 arcseconds/pixel

Baader H-alpha 7nm 22x1200s, binned 2x2

Baader O-III 8,5nm 4x1200s, binned 3x3

S-II is taken from my older wide field image