Back to the bottom of the Sh2 series... there are a number of interesting objects just beyond my grasp in the Southern Hemisphere here......
This one was very tricky due to the big star... the area is full of H-alpha too. The star was masked with a GAME mask in PI and the colors managed as best as I could in 3D-LUT after HA added to the Red channel... about 20%.
From GalaxyMap:
Sh 2-7 is the core of a huge diffuse nebula and is ionised by the B0.2IVe subgiant binary Delta Scorpii, a member of the nearby Sco OB2 association.
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 251 (80%).
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 46 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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