Triple APOD - October 30, 2025: Bubble Nebula (NGC 7635) By Allen Schultz All-Star Amateur Astronomy Photo of the Day - Click to Enlarge


Triple APOD - October 30, 2025: Bubble Nebula (NGC 7635) By Allen Schultz

From Allen: 

C11 - NGC 7635 Bubble Nebula was captured using Ha_OIII shots from 2025-08-28 to 2025-09-12; SII_Hb shots from 2025-09-15 to 2025-09-18.  There is about 24.75 hours of integration (11.9 hrs Ha_OIII and 12.8hrs SII_Hb) .  

Colour images (after stacking, starnet, de-noise, and stretching) were imported to post and HSL sliders were used to re-vector the colour for the Ha_OIII to the Hubble palette.

Location: Calgary backyard (Bortle 8/9)

Equipment:
Askar 103 APO with 0.8x reducer
Orion Mini 50mm guide scope
ZWO ASI585MC-P cooled camera
ZWO ASI120MM Mini
Celestron AVX mount
ZWO ASI Air Plus 256
ZWO EAFN-5V auto focuser
Antlia ALP-T-2 Dualband 5nm Ha/OIII 2”
Antlia ALP-TSB-2 Dualband 5nm SII/Hb 2"
ZWO Filter Drawer

Imaging:

143 x 300s Ha_OIII  subs (Ha_OIII filter)
154 x 300s SII_Hb subs (SII_Hb filter)

Processing:

Siril 1.2.4 for stacking, starnet, stretching
Graxpert 3.02 for de-noise
Affinity Photo 1.10.8 for post processing

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