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M42: Orion Nebula

RA= 5 hr 25 min; Dec = -5 deg 23 min

Date & Site:

Imaged on 12/6/17; Carlsbad, CA

Conditions: temps in the mid 60's; calm; very good seeing


Telescope: TEC 140mm Refractor 980 mm at f/7

Guider: SBIG external guide camera with Hutech OAG5

Mount: Losmandy G-11 with Gemini I
Camera: ST-10XME; CFW10; Astrodon Narrowband (3nm) Ha, SII and OIII filters


Exposures: 45 min each (15 min subs) of Ha, OIII, SII for total of 2:15 hrs.

Color mapped using the Hubble palette: Ha = green; SII = red; OII = blue. Added a final (luminance) layer from a single 2 min SII exposure to sharpen stars within the trapezium.

FOV = 52 x 35 arc minutes

1,325 light years away

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