Imaging telescope or lens: APM LZOS 130/780 f/6 LW CNC II 130mm APO
Imaging camera: FLI ML16200
Mount: Takahashi EM-200 Temma2
Guiding telescope or lens: Orion Deluxe 50mm MiniGuider
Guiding camera: Orion SSAG
Focal reducer: Riccardi Reducer/Flattener 0.75x
Filter: Astrodon Gen2E LRGB
Dates: Dec. 2, 2016
Integration: 5.8 hours
Avg. Moon age: 2.24 days
Avg. Moon phase: 5.58%
Mean SQM: 21.52
Astrometry.net job: 1422641
RA center: 60.303 degrees
DEC center: 36.344 degrees
Pixel scale: 5.546 arcsec/pixel
Orientation: 89.021 degrees
Field radius: 1.680 degrees
A 5.9 hr HaLRGB image of this classic emission nebula around 100 light-years long. The Ha line dominates from ionized hydrogen recombining with free electrons. It is believed that the bright, hot, bluish Xi Persei, just right of the nebula (North is to the left) is providing the energetic starlight that ionizes much of the nebular gas. Image taken from 100 miles south of the San Francisco Bay area seen in the image (but in Earth coordinates) at D.A.R.C. Observatory, Mercey Hot Springs, CA (12/2/16).
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