This nebula  lies next to the famous globular star cluster known as Messier 4. SH2-9 has an excellent reflection nebula around the star itself which is surrounded by the nice red emission part of this nebula. The nebula responds very well to a Hydrogen Alpha filter, but you will need a long exposure to capture the nebula that extends around the main star. You need to be careful of getting strong reflection from Antares which is not far, so you may want to include Antares into the image if you can. The H-Alpha channel will hide the reflection nebula seen in this image, so you will need to be careful when processing it.

Imaging telescopes or lenses: Intes Micro MN84
Imaging cameras: QSI 583 wsg
Mounts: Astro-Physics 1200 GTO
Guiding cameras: Starlight Xpress Lodestar
Software: Adobe Photoshop CC
Filters: Astrodon RGB filter set, Astrodon H-alpha 3nm narrowband filter
Dates: May 24, 2011
Frames:
Astrodon H-alpha 3nm narrowband filter: 24×1200″
Astrodon RGB filter set: 72×600″

Autor: Dean Salman

AstroPhotography of the day by SPONLI

08 February 2014

We select the best works of amateur astrophotographers with details of equipment, shooting processing etc.