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Abell 347 Galaxy Cluster



Scope: FSQ-106N at f/5, Location: DAA Observatory, Shelter Valley, CA, 23 September 2019,  Camera: ST8300M (Baader LRGB filters)

Exposure: Exposure: 24 x 8min  (1x1 bin) exposure with UV/IR block filter,  10 x 4 min (2x2 bin) each RGB exposures.

Processing: Data Collection -  Sequence Generator Pro (as FITs).  Subframe calibration - Pixinsight. Subframe integration (Median combine -  Winsorized Sigma Clipping) - PixInsight.  Non-linear stretching and normalization  - PixInsight.  Generation of starless and "stars only" Luminance images for later processing - starnet++. Curves, Levels, RGB combine, Luminance layering - PixInsight. Luminance Stars and Starless combine - PixInsight.  Final finishing  - Photoshop.  RGB calibration - eXcalibrator. Annotation - PixInsight, Aladin (Simbad and NED), and PhotoShop. This image is a  RGB combine with Luminance layering. The Luminance master was processed with starnet++  for both galactic structure (surface brightness) and stars only image. Images processed at 3352 x 2532 resolution. Final Image size is approximately  3352x2514.

North is up in this image.  This image shows the Galactic cluster Abell 347  (ACO 347) region. The above image shows the core of the galactic cluster. It includes galaxies NGC  898, 906,909,910, 911, 912, 913, 914. The cluster members are between 218 and 274 million light years distant.  The full size image has a broader field of view that includes Arp 145 and the well known NGC 891 galaxies. NGC 891 is not an Abell 347 cluster member; it is a foregrond galaxy and is about 32 million light years distant These objects and some of the brighter stars are identified in the annotated image. Horizontal FOV is approximately 120 arc minutes. Full size image scale is 2.15 arcsec/pix.

Image center is approximately - Equatorial 2000: RA: 02h 19m 11s Dec: +4259'48" 


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