Another two Sharpless2 objects that are seen in the context of the surrounding H-alpha clouds thanks to the stretching optimized with GHS.
GHS Forum DiscussionEarlier 11h Tak 180 ED version from 7 years ago.
Sh2 219 and 217 in H-alpha and RGB Basic combination done with Alex Woronow's NB Assistant.
RGB Stars-to-Narrowband Transfer using PixelMath - V11 by Bill Blanshan.
From GalaxyMap:The 4 million year old HII region
Sh 2-217 is ionised by the O9.5 V star
LS V +47 24.
Russeil places Sh 2-217 in the same star formation complex as Sh 2-219 and BFS 44.
Avedisova concludes that
Sh 2-219 is ionised by the stars
LS V +47 24 (O9.5 V) and
LS V +47 22 (B0 V).
The nebula is very young - perhaps only about 100 thousand years old. There is also an embedded star cluster to the southwest and a nearby 2000 solar mass molecular cloud
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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