Came back to this because there was some interest in the object and now with my new camera I decided to go deep. This is with the reducer. A lot different from the original CCD image:
Sh2 289 RGB HA From GalaxyMap:
Avedisova concludes that Sh 2-289 is ionised by the B0.5 V class LSS 86 and an uncatalogued B1 V class star (MFJ Sh 2-289 2). Curiously, she omits two other ionising stars mentioned by MFJ: LS 85 and MFJ Sh 2-289 4. (Both are B-class according to SIMBAD.)
One huge distance estimate of more than ten thousand parsecs may place this nebula beyond even the Cygnus (Outer) arm. However, closer estimates are also available.
Sh 2-289 is located well below the galactic plane, and this may in part be related to an outer galaxy warp in the third quadrant which bends the galactic disk downwards.
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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