From GalaxyMap:
A small HII region located in front of the right wing of the Seagull nebula. Avedisova says that it is ionised by three B2 V class stars: HD 52942, HD 53010 and BD -11 1761. She places it in star formation region SFR 224.20-1.60 with other parts of the Seagull nebula. However, in a 1989 paper she gives a distance estimate of about 700 parsecs, closer than the main portion of the Seagull nebula and implying that it may be a foreground object.
SIMBAD lists HD 52942 as the illuminating star for the reflection nebula VDB 90a and BD -11 1761 as the illuminating star for the reflection nebula VDB 92b, implying that the HII region surrounds several reflection nebulae.
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 242 (77%).
There are 11 too diffuse/large to image with my set up.
There are 6 that are never above 14 DEG elevation at my site and are too low for my 17 DEG min due South.
This leaves me 54 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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