An new view expanded with color of the prior image from the collection:
Sh2 234 Spider H-Alpha There still is much more detail in the greyscale. I did a couple LUTs to:
1. Creative Level: Red Color Detail
2. Basic Example Level: Brighten 20% after 1.
From
GalaxyMap:This is IC 417, sometimes called the
Spider nebula. Sharpless 2-234 and 2-237 are together sometimes called
the Spider and the Fly.
IC 417 surrounds the star cluster
Stock 8. Avedisova gives two ionising stars:
HD 35619 (O7V) and
BD +34 1054 (B0 IV). SIMBAD gives O9.5V for this second star.
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.
Sometimes called the
Fly nebula, this nebula surrounds the open cluster
NGC 1931. Sharpless 2-234 and 2-237 are together sometimes called
the Spider and the Fly.
Avedisova lists two B0 V class ionising stars:
LS V +34 46 and
LS V +34 47.
GENERAL NOTE ON SHARPLESS2 OBJECTS>>>>>>>>>>>>>
There are 313 Sh2 objects and I have imaged all one way or another.
The first one was taken on December 23, 2013 and the series completed October 17, 2019.Some of the challenges with this series are FOV size and low declination:
FOV: 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.
DEC: 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.
EQUIPMENT: 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. 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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