Location / Date

Zellerndorf, Aug - Oct 2019

Telescope / Mount / Guiding

ASA 10" Astrograph, ASA 3" Wynne-Corrector (focal length 910mm)
ASA DDM60, no guiding

Camera / Exposure

Moravian G3-16200, Astrodon filters

2-panel mosaic:
L total 117 x 10min
R 50 x 5min (bin2x2), G 52 x 5min (bin2x2), B 67 x 5min (bin2x2)
Hα total 72 x 20min
OIII total 60 x 20min

Total exposure time: 77h 35min

Processing

PixInsight, Fitswork, Photoshop

Notes

IC 5076 (also known as vdB 137) is a reflection nebula visible in the constellation of the Cygnus. The nebula is illuminated by the star HD 199478, a blue supergiant of spectral class B8. Its apparent magnitude is 5.73 and shows variations in brightness in the order of 0.1 magnitudes (also known as variable Star V2140 Cygni). Its distance is estimated to 5700 light years from earth. The open cluster NGC 6991 includes the area where IC 5076 is located.

VdB 138 and the grayish nebula GN 20.57.4 are reflection nebula, GN 20.57.4 is embedded in the dark nebulae LDN 958.

Zol 1 was discovered in 2013 by the French amateur astronomer Stephane Zoll in narrow-band images he took of this region. It was confirmed to be a true Planetary nebula in 2015.

NGC 7026 is a small but bright, multipolar planetary nebula located 6000 light-years away.

The small and faint nebula IPHASX J210205+471015 (or IPHASX J210204.7+471015, G088.0+00.4) was originally catalogued as possible planetary nebula by the Deep Sky Hunters member Philipp Teutsch in 2006 (Te J2102.1+4710), but in 2018 was found to be a nova shell around a cataclysmic variable binary star resulting from a nova event that took place about 130-170 years ago, although it was unnoticed at that time.
Scientific publications here, here and here.

Cataclysmic variables (CVs) are binary systems in close orbit in which a secondary component transfers H-rich material to the white dwarf main component via an accretion disc or directly onto the surface of highly magnetized white dwarfs. This material builds up onto the white dwarfs surface until it reaches a critical mass limit and experiences a thermonuclear runaway in a classical nova explosion. Significant amounts of highly processed material are ejected at high speeds into the interstellar medium (ISM). The violent ejection of material in the nova event sweeps, shocks and compresses the surrounding ISM and forms an arc-like feature with an oxygen rich bowshock to the left. The cataclysmic variable is the star immediately to the right of the centre of the arc-like ring.

Thanks to Mr. Sakib Rasool for suggesting this area to image.