Another version of this group using my new CMOS camera.
All versions used the Narrowband Assistant PI script from
@Alex Woronow .
I did not use StarXTerminator on this rather just denoised with NoiseXTermninator and trusted to GHS to not blow out the stars. I got better star color by increasing saturation only in Photoshop. A lot of detail came in from the GHS stretching.
The "Final" version added some detail processing. A couple other versions added to show the luminosity hidden away here.
Previous version from a long long time ago (2016) on CCD with my Tak 180Ed when I was discovering narrow band filters.
Animation of Sh2 157 (RGB versus H-alpha) AKA The Lobster Claw Discussion of GHS aspects of processing:
GHS Forum DiscussionFrom GalaxyMap:The northern portion of Sh 2-157 (
Sim 13, sometimes known as
Sh 2-157a) is a ring nebula around the Wolf-Rayet star
WR 157, in the
Basel 3 star cluster that is in turn part of the
Cas OB2 association.
The southern portion of Sh 2-157 (
Sim 14) may be ionised by stars not belonging to Basel 3.
Sh 2-157b is an ultracompact HII region visible within the more diffuse Sh 2-157a nebula.
Avedisova lists 4 additional ionising stars for Sh 2-157 (besides WR 157). These include the O7 I supergiant
BD+59 2673.
GENERAL NOTE ON SHARPLESS2 OBJECTS>>>>>>>>>>>>>There are 313 Sh2 objects. All now imaged.
This is my collection:
Sharpless2Wide-Angle Hydrogen Alpha Nikon Image Sh2 79-171Please note there is also a Sharpless2 Group with now more than 2700 examples.
Sharpless2 GroupOther useful links include:
Gary Imm's CollectionGalaxyMap's CollectionThe Sharpless CatalogThe MDW H-alpha Sky SurveyReiner Vogel's detailed observing catalogHope you enjoy these obscure but interesting objects...
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