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Holmberg 124 and NGC 2805



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: +6409'36" 


All images and content remain the property of Jim Thommes - copyright 2003 - 2016 copyright 2003 - 2012

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