Starbash Images

Semiautomatic (beta) image workflows by Starbash

Starbash targets by geeksville Hosted on GitHub Pages — Theme by mattgraham

Sh2 91

Processing summary

Coordinates: RA 19 35 44 / Dec +29 51 09

Sh2 91

Workflow

The stages used to process this target, with each stage’s parameters:

Parameters: grey = recipe default · amber = this target’s override
  • master_dark siril Generate master dark
  • master_bias siril Generate master bias
  • master_flat siril Generate master flat
  • light_vs_bias siril Extract OSC light calibrated vs bias
    • options = "-cfa -equalize_cfa"
  • light_vs_dark siril Extract OSC light calibrated vs dark
    • options = "-cfa -equalize_cfa"
  • light_no_darks siril Calibrate OSC lights that have no dark frames available
    • options = "-cfa -equalize_cfa"
  • stack_osc siril skipped Basic OSC stacking (no fancy narrowband extraction)
    • registration = "rej w 3 3"
    • filtering = "-filter-wfwhm=80%"
    • drizzle = ""
    • options = "-norm=addscale -output_norm -rgb_equal -32b"
    • framing = "max"
  • seqextract_haoiii siril Extract OSC HaOiii channels
  • stack_dual_duo python stack Stack OSC dual duo (HaOiii + SiiOiii) filter data: with separate Ha, Oiii and Sii channels
    • drizzle = "-drizzle"
    • framing = "cog"
    • filtering = "-filter-wfwhm=80% -filter-round=80% -filter-bkg=80%"
  • stack_single_duo python Stack OSC single duo (HaOiii) filter data: with separate Ha and Oiii channels
    • drizzle = "-drizzle"
    • framing = "cog"
    • filtering = "-filter-wfwhm=80% -filter-round=80% -filter-bkg=80%"
  • background graxpert background Do background subtraction with graxpert
    • smoothing_option = 0.5
    • ai_version = "1.0.1"
  • deconv-obj graxpert deblur skipped Do object deconvolution with graxpert
  • blur_exterminator rc-astro deblur Sharpen/deconvolve with BlurXTerminator (rc-astro bxt)
    • sharpen_stars = 0.5
    • sharpen_nonstellar = 0.5
  • denoise skipped Do denoising with graxpert
  • noise_exterminator rc-astro denoise Denoise with NoiseXTerminator (rc-astro nxt)
    • denoise = 0.9
    • denoise_intensity (no default)
    • denoise_color (no default)
    • denoise_hf (no default)
    • denoise_lf (no default)
    • denoise_intensity_hf (no default)
    • denoise_intensity_lf (no default)
    • denoise_color_hf (no default)
    • denoise_color_lf (no default)
    • frequency_scale (no default)
    • iterations = 2 (default 2)
  • palette_sho siril skipped SHO palette: R=Ha, G=Sii-or-synthetic, B=OIII
    • ha_weight = 0.4
    • oiii_weight = 0.6
  • palette_hoo siril HOO palette: R=Ha, G=OIII (optionally blended with Ha), B=OIII
    • green_ha_weight = 0.0
  • starnet starnet Star removal with StarNet via Siril
    • params = "-stretch"
  • veralux python Do VeraLux HyperMetric Stretching
    • background = 0.05 (default 0.1)
    • log_d (no default)
    • protect_b (no default)
    • star_recovery (no default)
    • color_grip (no default)
  • merge_stars siril Screen-blend the removed stars back into the stretched starless image
    • stretch = 1000.0 (default 1000.0)
  • thumbnail siril Generate a stretched thumbnail image
    • size = 1600
    • quality = 95
  • crop python Crop and rotate stacked FITS outputs
    • crop_width = "80%"
    • crop_height = "80%"
    • rotate_deg = 0
  • report_stack_osc python Record per-frame registration metrics for basic OSC stacks
    • seq_basename = "r_osc"
  • report_duo python Record per-frame registration metrics for duo stacks
    • seq_basename = "r_all_ha"
  • palette_broadband siril Broadband palette: load the denoised broadband stack and save it as broadband.fits
  • grax-denoise graxpert denoise Do denoising with graxpert

View processing workflow

Sessions

2026-08-11

Focal length Focal ratio Image scale
600.0 mm f/7.5 1.29 arcsec/pixel
Equipment Model
camera ASI2600MC Duo
telescope Askar V APO Refractor
filter Optolong L-Ultimate 2-inch Dual-Band 3nm Ha+Oiii Filter
filterwheel ZWO EFW 5x2 Filter Wheel

Session timeline

2026-08-12

Focal length Focal ratio Image scale
384.0 mm f/4.8 2.02 arcsec/pixel
Equipment Model
camera ASI2600MC Duo
telescope Askar V APO Refractor
filter Optolong L-Ultimate 2-inch Dual-Band 3nm Ha+Oiii Filter
filterwheel ZWO EFW 5x2 Filter Wheel

Session timeline

2026-08-25

Focal length Focal ratio Image scale
384.0 mm f/4.8 2.02 arcsec/pixel
Equipment Model
camera ASI2600MC Duo
telescope Askar V APO Refractor
filter Optolong L-Ultimate 2-inch Dual-Band 3nm Ha+Oiii Filter
filterwheel ZWO EFW 5x2 Filter Wheel

Session timeline

2026-08-26

Focal length Focal ratio Image scale
384.0 mm f/4.8 2.02 arcsec/pixel
Equipment Model
camera ASI2600MC Duo
telescope Askar V APO Refractor
filter Optolong L-Ultimate 2-inch Dual-Band 3nm Ha+Oiii Filter
filterwheel ZWO EFW 5x2 Filter Wheel

Session timeline

2026-08-27

Focal length Focal ratio Image scale
384.0 mm f/4.8 2.02 arcsec/pixel
Equipment Model
camera ASI2600MC Duo
telescope Askar V APO Refractor
filter Optolong L-Ultimate 2-inch Dual-Band 3nm Ha+Oiii Filter
filterwheel ZWO EFW 5x2 Filter Wheel

Session timeline

2026-08-29

Focal length Focal ratio Image scale
384.0 mm f/4.8 2.02 arcsec/pixel
Equipment Model
camera ASI2600MC Duo
telescope Askar V APO Refractor
filter Optolong L-Ultimate 2-inch Dual-Band 3nm Ha+Oiii Filter
filterwheel ZWO EFW 5x2 Filter Wheel

Session timeline

2026-08-30

Focal length Focal ratio Image scale
384.0 mm f/4.8 2.02 arcsec/pixel
Equipment Model
camera ASI2600MC Duo
telescope Askar V APO Refractor
filter Optolong L-Ultimate 2-inch Dual-Band 3nm Ha+Oiii Filter
filterwheel ZWO EFW 5x2 Filter Wheel

Session timeline

2026-08-31

Focal length Focal ratio Image scale
384.0 mm f/4.8 2.02 arcsec/pixel
Equipment Model
camera ASI2600MC Duo
telescope Askar V APO Refractor
filter Optolong L-Ultimate 2-inch Dual-Band 3nm Ha+Oiii Filter
filterwheel ZWO EFW 5x2 Filter Wheel

Session timeline