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M101 — Pinwheel Galaxy (LRGB synthetic luminance) · M101

Re-stretch of the luminance master with the Hα channel blended in, bringing out the HII regions along the spiral arms while keeping a monochrome aesthetic.

Messier 101 (Pinwheel Galaxy) in Ursa Major — mono LRGB + Hα stack from Plau am See
initialising deep-zoom…
acquisition · tap to expand
TargetM101
TypeGalaxy
RA14h 03m 12.6s
Dec+54° 20′ 56″
Captured2026-03-15
Integration~6 h
FramesL ~1.5h · R/G/B ~30m each · Hα ~2.5h
FiltersL, R, G, B, Hα (1.25")
Gain100
Sensor-10 °C
SiteKlebe, Plau am See, Mecklenburg
BortleBortle 3