Another Sharpless2 object seen in the context of stretching optimized with GHS. There is some O-III in the target but weather has gone south for me and I am not sure I will be able to get enough this year.
GHS Forum DiscussionThis current image is much more detailed than my CCD version.
Sh2 221 Basic combination done with Alex Woronow's NB Assistant. Just used this for the Star color. Ha stretched with GHS separately.
RGB Stars-to-Narrowband Transfer using PixelMath - V11 by Bill Blanshan.
From GalaxyMap:This prominent supernova remnant, better known as HB9 (
SNR G160.4+02.8), is visible both at
hydrogen alpha and
radio frequencies.
It is incorrectly listed by SIMBAD as an HII region.
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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