Sh2-202 - Emission Nebula in Cassiopeia


Sh2 -202 is an extended diffuse nebula visible on the border between the constellations of Cassiopeia and Camelopardalis (The Giraffe).

It is in the far east of Cassiopeia, east of the nebulae Heart and Soul , at the point where the Milky Way appears to stop abruptly, because of large shoals of dark dust. It is widely dispersed so weak and hard to detect. Direct observation is impossible and in any long-exposure appears only as a faint cloud centered on open cluster Stock 23, which is the best point of reference for its identification. The best period of observation in the evening sky is the months of October through March. 

[Source: Wikipedia]

Apogee U16M camera w Astrodon Gen II filters
Takahashi FSQ Refractor w Robofocus
20 x 15 min for H-Alpha
8 x 5 min RGB
Paramount ME guided w ST-402 and eFinder
Image acquisition in CCDSoft5

Calibration, Alignment and Sigma Reject combine in Maxim
Levels, Curves in PS CS4

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Captured Oct 10/11th 2010
Flesherton, Ontario