2023 Michael A. Siniscalchi
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        Sh2-200 (HDW 2)
     Planetary Nebula near Cassiopeia
          RA 03h 11m 03s  Dec: +62 43' 02" Distance - ~3500 ly


   This nebula was first discovered by the astronomer Stewart  Sharpless in 1959 and included it in his catalogue of HII regions as Sh2-200.
In 1983 Sh2-200 was included in the HDW catalogue (HWD 2) by astronomers Herbert  Hartl, Johann Dengel and Ronald Weinberger as a possible planetary nebula.
In 1987, using narrow band imagining, Herbert Hartl and Ronald Weinberger detected a large faint outer halo extending further than the central shell.
In 2017 it was confirmend to be a planetary nebula when spectra was taken as part of professional observations.
The popular name is the Bearclaw Nebula.





Click on image for full size


Location & Date
Backyard, Abbott Observatory- Long Island, NY,  January, 2023
Telescope
TMB130SS F/7 APO, Moonlite focuser, Losmandy G11 Gemini
Image scale 1.54 arcsec/pixel
Camera
SBIG ST-10XME
Baader  Ha OIII filters
CCD temp -15C
Exposures
Ha-12x10m  OIII 12x10m Bin 1x1
Planning & Acquisition
Sequence Generator Pro
Processing
CCDStack - calibration, debloom
Adobe Photoshop -   Ha+OIII Color processing
RC-Astro Star XTerminator, Noise Xterminator
Topaz Gigapixel AI - Nebula core deconvolution
Click on image for larger size