juichi.space / astroNGC 253 — Sculptor Galaxy
2 sets of this object, newest first: LRGB, mono astrograph (T71) · One-shot colour, CLS filter (T74)
LRGB, mono astrograph (T71)
T71 · 8 frames · 14 min · 2026-11-05
full resolution · 4164 × 6236 · 3.2 MBhow it was made ↓The Sculptor Galaxy again, this time through a 180 mm f/2.8 mono astrograph with luminance and red, green and blue filters, so the colours are measured directly. A dusty starburst spiral about 11 million light-years away.
- Telescope
- StellarDock T71 · 180 mm f/2.8 astrograph · mono + filters
- Where
- Deep Sky Chile
- Exposure
- 8 frames · 14 min · 1 session
- Filters
- Blue × 1, Green × 1, Luminance × 5, Red × 1
- Colour
- R=Red G=Green B=Blue (visible filters by wavelength)
- Star FWHM
- 2.6 px
- Stacked
- 2026-11-05
- Full size
- 4164 × 6236 px · 3.2 MB JPEG
processing notes
R=Red G=Green B=Blue (visible filters by wavelength) | matched Luminance d=(-0.01,-0.01) corner 0.03 blur 0.439, Blue d=(+0.02,-0.00) corner 0.03 blur 0.4, Green d=(+0.00,+0.00) blur 0.559, Red d=(+0.01,+0.00) corner 0.03 | Gaia white (G2V, 127 stars): R x1.650 B x0.829 | colour matrix (111 stars, rms 0.016 -> 0.012) | LRGB: light from Luminance, RGB as colour ratios
One-shot colour, CLS filter (T74)
T74 · 5 frames · 10 min · 2026-11-05
full resolution · 4783 × 3182 · 1.9 MBhow it was made ↓The Sculptor Galaxy, a dusty starburst spiral about 11 million light-years away, seen nearly edge-on from Chile through a light-pollution filter. Star colours are set against the Gaia catalogue.
- Telescope
- StellarDock T74 · 150 mm f/7.3 · one-shot colour
- Where
- Deep Sky Chile
- Exposure
- 5 frames · 10 min · 1 session
- Filters
- CLS × 5
- Colour
- one-shot colour (CLS)
- Star FWHM
- 2.7 px
- Stacked
- 2026-11-05
- Full size
- 4783 × 3182 px · 1.9 MB JPEG
processing notes
one-shot colour (CLS) | Gaia white (G2V, 291 stars): R x1.380 B x0.974 | colour matrix (291 stars, rms 0.049 -> 0.026)