Gary Imm pointed out some of the interesting wave forms to the right. I put the Ha up to bring these out.
From Galaxymap:
Avedisova lists 6 ionising stars for the Tulip nebula, including the ultrahot O4 I multiple supergiant
HD 190429, the O6.5 III giant
HD 227018, and the O9.7 I multiple supergiant
HD 226868.
Humphreys places HD 227018 in the
Cyg OB3 association. As you can see from
this false colour hydrogen-alpha image, the Tulip nebula is located at the edge of the Cyg OB3 association.
The HD 226868 star system is best known because it includes the powerful X-ray source and suspected black hole
Cyg X-1.
Available distance estimates place the Tulip nebula and Cyg OB3 in the Orion spur, some distance behind the Cygnus X star formation region.
You can see the setting for the Tulip nebula in this
amazing wide angle image.
This
MSX image reveals that the Tulip nebula is just a small portion of a much larger nebula visible in infrared.
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 1500 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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