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OBJECT

NGC 6888 (Crescent Nebula) in HaRGB   (images above are reduced-size | other sizes for top imagemedium , original)

Distance:  5,000 light years

Telescope Takahashi TOA-130F @ f/7.7
Mount Takahashi EM200 Temma II
Camera QSI 540wsg @ -10C
Filters Astrodon Ha (3nm), Astrodon Tru-Balance I-Series LRGB Gen 2
Guider SX Lodestar
Settings 5x20min Ha (bin1x1); 2x5min ea RGB (bin2x2); AstroArt5, CS4 (slightly cropped, 10xdarks/flats/fdarks/bias)
Date/Location 28 September 2013 - Las Cruces, NM
Note: Top image is Ha_HaRGB, where Ha:R (40:60) was used for the Red channel, and Ha for Luminance.  Bottom image shows the Ha channel only, exposing dusty regions created by Hydrogen (read more about Ha at my blog).

Copyright  Jeffrey O. Johnson

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