In The Heart Of Cygnus

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Location / Date

Zellerndorf, Aug - Sept 2016

Telescope / Mount / Guiding

ASA 10" Astrograph, ASA 3" Wynne-Corrector (focal length 910mm)
ASA DDM60, no guiding

Camera / Exposure

FLI ML8300 with Astrodon filters for Luminance, Halpha and OIII
Canon 500D for RGB

4 x 4 panel mosaic:

Luminance   228 x 3min
RGB   402 x 3min
Hα   194 x 10min
OIII   37 x 10min

Total exposure time: 70h


PixInsight, Fitswork, Photoshop


This 4 x 4 mosaic shows the central region in the constellation Swan around the star Sadr (Gamma Cygni), in diagonal the field of view spans over 6 degrees. In the annotation I have added the moon as a size comparison.

The region is full of emission nebulosity (Gamma Cygni nebula, IC 1318, Sh2-208, IC 1318B, LBN 249, ...), faint reflection nebulae (vdB 130, GN 20.25.3, ...), dark nebulae (Barnard 343, ...), open clusters (M 29, NGC 6910, IC 1311, Roslund 6, ...) and some planetary nebulae (Abell 69, Pa 6, Ju 1, Sd 1, ...).

The little crescent-shaped nebula at lower right is NGC 6888, the Crescent Nebula. It formed when a hot giant star blew off its outer layers.

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