Another Sharpless2 object that is seen in the context of the surrounding H-alpha clouds thanks to the CMOS chip and stretching optimized with GHS.
I think the "Peanut" is the left half of the image, lined up vertically.
GHS Forum DiscussionFollowed GHS Dave's suggestion to represent Hb as 20% of Ha as Blue in the coloring of this image. I think it looks better, but hard to tell?
(C is without the Blue).
Nice discussion on Cloudy Nights. Prior versions:
CCD with same Stellarvue 130
Sh2 205 H-alpha RGB From GalaxyMap:Both Sharpless and Avedisova list the O9 class multiple star
HD 24431 as the main ionising star for the large diffuse Sh 2-205, sometimes
called the Peanut nebula. Avedisova also lists two cooler B-class ionising stars.
A recent series of papers divides the nebula into three distinct regions (although at similar distances), with the B-stars ionising a different region than HD 24431. They also suggest that CY Cam (
HD 24094) may be an O8.5 or O9 star instead of the usually suggested much cooler B8 and may be the main ionising star of LBN 148.11-0.45 (
LBN 696) in this direction.
A 2011 paper states that CY Cam is a B1 III giant.
Like Sh 2-202, this nebula lies at the edge of the
Cam OB1 association.
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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