M109 in Ursa Major
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ON IMAGE FOR FULL SIZE VIEW (2400x1800) Scope:
Celestron 9.25 Edge 235 mm at f/7, Location: Blair Valley, Anza Borrego Desert,
CA 14 March 2015 Camera: ST8300M Exposure:
Exposure: 16 x 8 min (2x2 bin) exposure with UV/IR block, 8 x 3 min
(3x3 bin) RGB exposures. Processing: Data
Collection - Sequence Generator Pro (as FITs). Calibrated, stacked
(Sigma Kappa Combine) in Deep Sky Stacker, L - RGB channel registration,
equalization, central gradient removal - Astroart. Curves, Levels, and
Luminance development, RGB combine - Images Plus. Finishing - Photoshop.
Color calibration with eXcalibrator. This image is UV/IR Block for the Luminance
channel and then a LRGB combine with Luminance layering. Saturation in LAB
color. Final Image size processed at approximately 2400x1813 resized
to 2400x1800. North is down in
this image. This field shows the barred spiral galaxy M109
(morphology SB(rs)bc). M109 is the dominant galaxy in the Ursa Major Galaxy
Cloud also known as the M109 galaxy group. This field contains many other
smaller galaxies most of which are background to M109 and not part of its
namesake galaxy group. Distance measurements vary from 51 to 74 million
light years for M109 but the most recent estimates put the distance
at 74 million light years. At the largest (most recent) distance measurement and
angular scale at that distance, M109 is a large galaxy spanning over 150,000 light years
in diameter. This makes M109 larger then our own Milky Way. The smaller galaxies are identified and
highlighted in the annotated
image. This image replaces an earlier image that can be seen in the archives
here. The Horizontal FOV is 38' Image
center is approximately - Equatorial 2000: RA: 11h 57m
34s Dec: +53°19'43"
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