Well, one more off the list, but I wonder what that blob is in the lower left corner... looks like it should have gotten a Sh2 number. Will have to plate solve in The Sky X and see it it can be identified.... possibly LBN 1022, but not a perfect overlap.
From GalaxyMap:
Avedisova associates Sh 2-291 with the carbon star EM Mon and places them both in the star formation region 220.52-2.77.
The available distance estimates place Sh 2-291 in the Cygnus (Outer) arm.
No ionising star appears to have been identified in the scientific literature.
GENERAL NOTE ON SHARPLESS2 OBJECTS>>>>>>>>>>>>>
I have been on a project for several years now to image all the Sharpless2 Objects that I can see from my location near San Francisco. I chose these because they are visible in light polluted areas. These objects generally represent left over Hydrogen along the edge of the Milky Way that has gotten molded into interesting shapes.
There are 313 Sh2 objects.
As of the date when this image was posted:
I had imaged 245 (78%).
There are 12 too diffuse/large to image with my set up (Sh2 111, 117, 122, 131, 132, 145, 178, 218, 221, 230, 268 and 310).
There are 6 that are never above 14 DEG elevation at my site and are too low for my 17 DEG min due South (Sh2 2-6 and 8).
This leaves me 50 potentially still do-able and most 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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