Complex of HII regions located in the Sgr OB5 association in the Sagittarius arm.
Sh2-19 is located in the middle of the image with Sh2-16 located to the lower right. In the middle of those two lies Sh2-18. Sh2-20 can be seen in the upper left and most of Sh2-17 is in the upper right.

Imaging telescopes or lenses: Intes Micro MN84
Imaging cameras: QSI 583 wsg
Mounts: Astro-Physics 1200 GTO
Guiding cameras: Starlight Xpress Lodestar
Software: PixInsight, Adobe Photoshop CC
Filters: Astrodon H-alpha 3nm narrowband filter, Astrodon RGB filter set
Dates: May 18, 2013
Frames:
Astrodon H-alpha 3nm narrowband filter: 18×1200″
Astrodon RGB filter set: 72×600″
Integration: 18.0 hours

Author: Dean Salman

AstroPhotography of the day by SPONLI
16 April 2014