M33 - Triangulum Galaxy (+Ha - "mouse-over" image to see Ha!!!)    (image above is reduced-size | other sizes:  medium , original)

Distance:  3 million light years

Telescope Takahashi FS-60C @ f/6.2
Mount Takahashi EM200 Temma II
Camera QSI 540wsg @ -15C
Filters Astrodon Ha (3nm), Astrodon Tru-Balance I-Series LRGB Gen 2
Guider SX Lodestar
Settings 12x10min L; 2x15min Ha; 2x5min ea RGB (all bin1x1); AstroArt5, CS4 (uncropped, 10xdarks/flats/fdarks/bias)

29 October 2014,  - Las Cruces, NM

This image is L_HaRGB, where Ha:R (60:40) was used for the Red channel, identifying ionized hydrogen (HII) star-forming regions in this galaxy as they appeared 3 million years ago. If you "mouse-over" the image, you will see it change from just LRGB (no mouse-over) to LHaRGB (mouse-over), giving a better sense of where these HII regions are located.

Copyright  Jeffrey O. Johnson

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