d B92 93Standard minimalist processing. Had to put up the original one HA image processed with AI.
From
GalaxyMap:Sh 2-39 is a tiny nebula contained within the boundaries of the much larger Sh 2-41 in the direction of the Sgr OB4 association. There is a bubble in this direction in the MSX infrared data.
Avedisova concludes that Sh 2-39 is ionised by the B1 III giant HD 167611 and the B2 III giant BD -18 4892 (HD 313050), at a distance of 2670 +/- 150 parsecs. She places the nebula in star formation region 12.46-1.07 along with a water maser and the young stellar object IRAS 18139-1842.
Sh 2-41 is a large diffuse nebula and a major component of Messier 24, the Small Sagittarius Star Cloud. Although Messier 24 is not a real object (being made up of many objects at different distances), Sh 2-41 is a real HII region surrounding the Sgr OB4 association, which includes the multiple O7 III giant HD 167771. You can see an image of the entire Messier 24 region hereGENERAL NOTE ON SHARPLESS2 OBJECTS>>>>>>>>>>>>>
There are 313 Sh2 objects. As of the date of this image I had imaged 297 (95%).
Here is the scorecard:
There are 12 too diffuse/large to image well with my set up (Sh2 111, 117, 122, 131, 132, 145, 178, 218, 221, 230, 268 and 310). I have images the first 6 of these mostly in the Nikon Wide angle shot referenced below and 178 and 230 as part of other images. I will do the rest at least once as they come into view this year, so I have 4 more of these to do. I missed 303 and 304 last year running out of time. So there are 6 more to do here.
There are 5 that are never above 14 DEG (Sh2 2-6) but as of 7/12/21 I can get these now with pier upgrades and the images are completed as best as I can. There are still 10 low ones between Sh2 30-50 that I can do this summer.
These 16 remaining all are in Expert Scheduler waiting for them to pass by.
The first one was taken on December 23, 2013.
Many were taken with my old Tak 180 ED, which had a wide field of view, but was replaced with my Stellarvue 130, which is more narrow field. I have also taken two very wide field HA images with my Nikon D800 and a 50mm lens.
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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