2022 Michael A. Siniscalchi

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    Simeis 57
       Emission Nebula Complex in Cygnus
       RA:20h 16m 27s  Dec: +44 07' 29" Distance - Unknown  Size - 23' x 4'

Click on image for a larger version
Click here for annotated version
Simeis57 was first catalogued in the 1950s by the Crimean Astronomical Observatory at Simeiz, Ukraine as number 57 which is a series of emission nebula in Cygnus X.
These same objects were also published in the DWB catalog by astronomers H. R. Dickel, H. Wendker and J. H. Bieritz in 1969.
  In the image center is the popular Propeller Nebula that is often incorrectly referred as DWB 111, which is actually the propeller's southern arm, while the northern arm is DWB 119.
Also captured in this 2 panel mosaic is DWB 107, DWB 108, DWB 111, DWB 125 & DWB 126 (see annotated version)

The project was originally taken in RGB frames but I wasn't happy with the lack of detail structure lost when using just the standard RGB filters and color palette. I decided to re-shoot this target using narrow band filters which better displays the structure details and spectral components of hydrogen, sulphur and oxygen. The RGB version stars were added in to get more accurate star colors.



Location & Date
Backyard, Abbott Observatory- Long Island, NY,  September  2021
Telescope
TMB130SS F/7 APO, Moonlite focuser, Losmandy G11 Gemini
Image scale 1.54 arcsec/pixel
Camera
SBIG ST-10XME
Baader  Ha OIII SII L R G B  filters
CCD temp -10C
Exposures
Ha-18x10m  OIII-24x10m  SII-18x10m  Red-12x5m Green- 12x5m Blue-12x5m   Bin 1x1
Planning & Acquisition
Image mosaic planning - Sequence Generator Pro
Image acquisition - Sequence Generator Pro w/PinPoint & PHD2 (guiding)
Processing
CCDStack - calibration, debloom
Astro Pixel Porocessor - normalize, align, stacking, mosaic assembly
Adobe Photoshop -   Ha+RGB Color processing, Noise reduction, JPEG conversion
Narrow Band Mapped colors: SII = Red Ha = Green and OIII = Blue
Star colors are from RGB frames
This is a 2 panel mosaic
Initial stretch of three hours exposure in Sulphur (SII)

Initial stretch of four hours exposure in oxygen (OIII)
Initial stretch of three hours exposure in Hydrogen alpha (Ha)

RGB traditional color version using 1 hour exposure for each channel