Another redo with my new equipment now that I have the field flatter... ask me how long it took to get a 9000x6000 pixel image to have round stars in the corners... if you have time to burn
From
GalaxyMap:This kidney-shaped HII region is the intersection point of two massive giant molecular clouds (100 thousand and 300 thousand solar masses respectively) with intense star formation. Infrared analysis using the Spitzer space telescope has found 86 young stellar objects within Sh 2-235.
One of these molecular clouds,
G174+2.5, contains Sh 2-231, Sh 2-232, Sh 2-233, and Sh 2-235 and lies at a distance of about 1800 pc.
Sh 2-235 is ionised by the O9.5 V star
BD +35 1201. Avedisova places this nebula in star formation region
SFR 173.61+2.80 with 54 components, including 7 masers, the smaller HI region
BFS 46 and several Herbig-Haro objects.
Sh 2-231 to Sh 2-235 form a complex of HII regions located together in the Perseus arm in the outer galaxy. This complex may be associated with an old (330 thousand years) supernova remnant,
FVW 172.8+1.5.
You can
view a larger visual frequency image of Sh 2-235 here and an
infrared image here.
GENERAL NOTE ON SHARPLESS2 OBJECTS>>>>>>>>>>>>>
There are 313 Sh2 objects. As of the date of this image I had imaged 313 (100%). Last in the series.
Some of the challenges with this series are FOV size and low declination:
There are 11 too diffuse/large to image well with my set up (Sh2 111, 117, 122, 131, 132, 145, 178, 218, 230, 268 and 310). I have imaged the first 6 of these mostly in the Nikon Wide angle shot referenced below and 178 and 230 as part of other images.
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.
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. I transitioned from my CCD SBIG 8300M to a CMOS ZWO ASI6200M Pro in September 2021.
The first one was taken on December 23, 2013 and the series completed October 17, 2019.This is my collection:
Sharpless2
Wide-Angle Hydrogen Alpha Nikon Image Sh2 79-171
Please note there is also a Sharpless2 Group with now more than 1500 examples.
Sharpless2 Group
Other useful links include:
Gary Imm's Collection
GalaxyMap's Collection
The Sharpless Catalog
The MDW H-alpha Sky Survey
Reiner Vogel's detailed observing catalog
Hope you enjoy these obscure but interesting objects...
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