Sharpless 115 stands just north and west of Deneb, the alpha star of the constellation Cygnus, the Swan. Noted in the 1959 catalog by astronomer Stewart Sharpless (as Sh2-115) the emission nebula lies along the edge of one of the outer Milky Way’s giant molecular clouds, about 7,500 light-years away. Hot stars in star cluster Berkeley 90 power the nebular glow. The cluster stars are likely only 100 million years old or so and are still embedded in Sharpless 115.
The small blue object, is Abell 71. The nebula is also cataloged as PK 085+04.1, PN G084.9+04.4 and Sh 2-116. Initially cataloged as a planetary nebula, the object is now recognized as a small patch of HII emission.

Imaging telescopes or lenses: Takahashi FSQ130ED
Imaging cameras: FLI ML16200
Mounts: Takahashi EM 400 Temma 2M
Guiding telescopes or lenses: Takahashi FS60CB
Guiding cameras: QHY CCD QHY 5 II
Focal Extender / Reducer: None
Software: PHD 2, Pleiades Astrophoto PixInsight , Astro Pixel Processor (for stacking), Sequence Generator Pro SGP (for capture)
Filters: Astrodon Ha, OIII, SII
Accessories: Robofocus Focuser, ATIK EFW3

Original Resolution: 4200 x 2800
Dates: 24th Aug – 30th Aug ’20

Frames:
Astrodon Ha 48 x 10′
Astrodon OIII 27 x 10′
Astrodon SII 27 x 10′
‚ÄčTotal Time: 17 Hours

Autore: Brendan Kinch (sito)