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Sh 2-155, from the Sharpless catalog, also known as the Cave Nebula, is a diffuse nebula in the constellation Cepheus, within a large nebula complex containing emission, reflection and dark nebulae. Sh 2-155 is an ionized H II region with ongoing star formation activity, at an estimated distance of 2400 light-years from Earth.

Technical details, high resolution and annotated versions available on Telescopius: telescopius.com/pictures/view/

Image license: CC BY-NC-SA 4.0.

#astrophotography #astronomy #photography #astrodon #nebula #DeepSky #space #sh2-155 #RGBHa #KStars #ekos #phd2 #GIMP

New image in the making! These are two UNPROCESSED stacked masters still hot from over 10h in the number-crunching machine.

The target is the nebula complex around Sh 2-155 in the constellation Cepheus which contains a rich mix of emission, reflection and dark nebulae.

The data has been collected over two and a half nights, 8h24m using a broadband light-pollution filter (first image) and 6h42m using a Ha + Oiii dual narrow band filter (second image). The broadband filter captures the natural colors of the stars and reflection nebulae whereas the dual narrow band filter mostly isolates the hydrogen alpha emissions. My objective is to combine the broadband RGB signal with the hydrogen alpha signal into a single image. The third image is a rapid, unprocessed, blend of the two masters giving a feel for what the combined image will look like.

Stay tuned for the final processed image in a few days!

#astronomy #astrophotography #astrodon #photography #space #nebula #sh2-155

SH 2-119 (from the Sharpless catalog of H II regions), also known as the Clamshell Nebula, is an emission nebula in the constellation Cygnus. It is fainter and not as frequently imaged as its western neighbour, the North America Nebula.

This image was captured over six nights between July 13 and August 1st. Two different dual narrow-band filters were used to capture the different wavelengths of the sulphur, hydrogen and oxygen emissions.

Technical details, high resolution and annotated versions available on Telescopius: telescopius.com/pictures/view/

Image license: CC-BY-NC-SA 4.0.

#astrophotography #astronomy #photography #astrodon #nebula #DeepSky #space #sh2-119 #sho #kstars #ekos #phd2 #DarkTable