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M17: Omega or Swan Nebula in Sagittarius

RA = 18h 20 min; Dec = -16 deg 10 min

Date & Site:

Imaged on 08/03/13; Palomar Mtn, CA

No wind; 61 degrees, excellent seeing


Telescope: TEC 140 Refractor at F7 FL= 980 mm

Mount: Losmandy G-11 with Gemini
Camera: ST-10XME; CFW10 with Astrodon filters;

Prime focus guiding


Exposures: 240 min in Ha (6nm) (24 x 10 min subs) = 4 hours

FOV = 30.8 x 27.6 arc minutes

The Omega Nebula is between 5,000 and 6,000 light years from us and it spans some 15 light-years in diameter. This image captured though a hydrogen-alpha filter emphasizes the complex chaotic appearing network of filaments formed by the emission of ionized hydrogen.

It is considered one of the brightest and most massive star-forming regions of our galaxy.

Cropped and reduced 60% from original


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