Hydrogen Phantom Mask

This one is HII molecular hydrogen cloud in Perseus arm of our Galaxy. It’s Sharpless number is Sh2-173, and can be found in Cassiopeia close to NGC103 open cluster (at the frame bottom). Pretty faint target, I collected 8 hours with hydrogen alpha filter and the outcome is moderate. This nebula nickname is Phantom Mask. 

Subframes were shot on September 25 and 26. All made with Photoline 130mm refractor and Atik383 camera on EQ6 mount under suburban sky.

Sh2-173 emission cloud, 32x15 minutes exposure, Ha band
Sh2-173 emission cloud, 32×15 minutes exposure, Ha band

Sh2-173 emission cloud, 32x15 minutes exposure Ha band, 180 minutes RGB
Sh2-173 emission cloud, 32×15 minutes exposure Ha band, 180 minutes RGB

Clear skies!

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