Another obscure Sharpless2 object that is seen in the context of the surrounding H-alpha clouds thanks to the CMOS chip and stretching optimized with GHS.
GHS Forum DiscussionA prior 175 close in exposure:
Sh2 175 H-alpha RGB From GalaxyMap:Sh 2-175 appears in the direction of a supershell of molecular and atomic hydrogen clouds surrounding the
Cas OB5 association, which is part of the Perseus arm. A widely varying range of distances to this nebula and its potential ionising star has been published in the scientific literature.
Avedisova gives the ionising star of Sh 2-175 as
LS I +64 26 (O9.5 V), which Humphreys lists as a field star outside of any OB association.
Russeil concludes that LS I +64 26 is actually a B1.5 V star at 1090 +/- 210 parsecs and locates Sh 2-175 at this much closer distance.
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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