The Bubble Nebula – NGC 7635 (HST)

The Bubble Nebula is emission nebula in the constellation Cassiopeia. It is 7100 light-years from our Earth. The most famous part of the nebula is the central part of the bubble. It was discovered in 1787 by William Herschel.

Telescope ASA 10″ F/3.6 10N ASTROGRAPH OTA
Focal length 900 mm
Mount G53f
Imaging camera Atik 460EX mono
Guiding cameras Lodestar X2 -Autoguider
Guiding optics ASA 10″- OAG
Focal reducers ASA 3″ Wynne Corrector 0,85x
Constellations Cassiopeia
Distance 7100 light years
RA center 23h  20′ 48.3″
DEC center +61°12′ 06″
Location taken Slovakia
Date taken 12/2020
Pixel scale 1.04 arcsec/pixel
Filters Astronomik Ha 6nm ,
Astrodon OIII 5nm,
Astrodon SII 5nm,
Exposure 48x1200s BIN1 Ha filter
43x1200s BIN2 OIII filter
43x1200s BIN2 SII filter
Total exposure 44,7 hours
Processing software PixInsight, CCD Inspector

The processing object The Bubble Nebula – NGC 7635 (HST) was captured using narrowband filters.
(Hydrogen-alpha – H-α 6 nm, Sulfur – SII 6 nm, Oxygen – OIII 5 nm)
Here you see a few hours of individual images, which are processed by joining in Hubble (Narrowband in Hubble Palette). Photos are only gently stretched (CurvesTransformation).
You can see the final product above.