Simeis 57, Propeller Nebula

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Image details:
Telescope: TS 90/600 triplet with 2.5" TS flattener
Mount: Skywatcher HEQ5-Synscan
Camera: Atik one 6.0
Exposure: 30 * 600sec Ha filter
Software: PixInsight
Calibrationfiles: Dark:No, Bias:Yes, Flat:Yes

 
(c) All photos by Ruud de Vries