Holmberg 124 and NGC 2805
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ON IMAGE FOR FULL SIZE VIEW (2600x1950) Scope:
Celestron 9.25 Edge 235 mm at f/7, Location: Blair Valley, Anza Borrego Desert, CA
12 February 2016 Camera: ST8300M (Baader LRGB filters) Exposure:
Exposure: 16 x 10 min (2x2 bin) IR/UV block exposures; 8 x 4.5 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 - Astroart. Curves, Levels, and
Luminance development, RGB combine - Images Plus. Finishing - Photoshop.
Color calibration with eXcalibrator. This image uses 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 3352x2532 cropped
and resized to 2600x1950. North is up in this
image. The dominant galaxy in this field is NGC 2805. There are three
galaxies to the upper left of NGC 2805 (NGC 2814, NGC 2820, IC 2458).
These four galaxies make up the Holmberg 124 Galaxy Group. There are also a number
of background galaxies - the brighter ones are in the annotated drawing. Also in
this field is a reasonably bright Quasor (barely detectable in this image.The
Holmberg 124 Galaxy Group members range from about 78 to 91 million light years
distant from Earth The other smaller galaxies
in the annotated image range form 550 million light years up to about 1.67
billion light years as estimated by redshift. These galaxies are identified and highlighted in
the annotated image.
The Horizontal FOV is 38' Image
center is approximately - Equatorial 2000: RA: 09h 20m
29s Dec: +64°09'36"
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