Triple APOD - July 24, 2025: Tulip Nebula (SH2-101) By Allen Schultz All-Star Amateur Astronomy Photo of the Day - Click to Enlarge


Triple APOD - July 24, 2025: Tulip Nebula (SH2-101) By Allen Schultz

From Allen:

SH2-101 was captured using Ha_OIII shots from 2025-05-29, 2025-06-08 to 2025-06-09; SII_Hb shots from 2025-06-30 to 2025-07-01; and RGB from 2025-07-02.  There is about 13.5 hours of integration (7hrs Ha_OIII, 6hrs SII_Hb, and 0.5hr RGB stars) .  

Rather than splitting the Ha, Hb, OIII and SII into individual monochrome images and performing RGB composition pixel math prior to post, the 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 Dualband 5nm Ha/OIII 2”
Antlia ALP-T Dualband 5nm SII/Hb 2"
ZWO Filter Drawer

Imaging:

46 x 30s RGB subs (no filter) for the stars
83 x 300s Ha_OIII  subs (Ha_OIII filter)
72 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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