NGC 2403 · NGC 2403

NGC 2403, a bright spiral galaxy ~8 million light-years away in Camelopardalis, famous for its giant pink HII star-forming regions. Mono LRGB + Ha through the 200 mm Newtonian.

The spiral galaxy NGC 2403 in Camelopardalis, showing loosely-wound arms studded with pink hydrogen star-forming regions

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TargetNGC 2403

TypeGalaxy

RA07h 36m 51s

Dec+65° 36′ 03″

Captured2026-04-21

Integration180 s subs

Frames180 s subs (LRGB + Ha)

FiltersL, R, G, B, Ha

Gain100

Processing notes

ToupTek ATR533M + filter wheel on the Explorer 200P Newtonian (1000 mm) + coma corrector, EQ5 Pro, PHD2 guiding. Stacked in Siril, finished in GIMP. Background gradient and green cast cleaned in post.