NGC 7635 - Bubble Nebula    (image is reduced-size | other sizes:  medium , original)

Distance:  7,100 to 11,000 light years

Telescope Takahashi TOA-130F @ f/7.7
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 Ha, 3x10min L (bin1x1); 4x5min ea RGB (bin2x2); AstroArt5, CS4 (slightly cropped, 10xdarks/flats/fdarks/bias)

3 September 2017 - Las Cruces, NM

Published in BBC Sky at Night Magazine, Feb 2018 issue (PRINT), pg 31 (photo).
as Astronomy Magazine Picture of the Day, 15 Dec 17 (screenshot).
as "100 Most Amazing Space Photos of 2017" (screenshot).
as "Space Image of the Day":
     - 28 Nov 17 slot (screenshot)

This image is LHaRGB, where Ha was used in combination with Luminance and Ha:R (80:20) was used for the Red channel.

Copyright  Jeffrey O. Johnson

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