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 -10°C
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