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M109: Barred Spiral Galaxy in Ursa Major

RA = 11 hrs 57 min; Dec = 53 deg 22 min

Date & Site:

Imaged on 3/30/14; Little Blair Valley, Anza Borrego Desert, CA

Clear; average seeing; poor transparency

Temperatures in mid 40s


Telescope: AT8RC (1625mm fl f/8)

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

Prime focus autoguided using SBIG ST-10 guidechip


Exposures and filters: 80 min of luminance (10 min subs) and 15 minutes each of RGB (5 minute subs) for a total of only 125 minutes.

FOV =32 x 21 arc minutes

M109 is by far the most distant object in the Messier Catalog (of 110 objects). The two smaller galaxies seen to the left (and below) of M109 are thought to be satellite galaxies of the larger M109.

Located ~60 million light years away

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