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NGC 5364 and Abell 1809 in Virgo



Scope: Explore Scientific MN152 at f/4.8, Location: DAA Observatory, Shelter Valley, CA, 9 April and 3 May 2021  Camera: ASI1600M (Astronomik Gen 2  LRGB Filters)

Exposure: Exposure: L - 64 x 4 minutes (gain-121 1x1 ,  RGB - 40(R), 32(G), 20(B)x 3 minutes  - ( all RGB gain-121 1x1).

Processing: Data Collection -  Sequence Generator Pro (as FITs).  Sub-frame calibration - Pixinsight. Sub-frame  registration and integration (Average combine -  Winsorized Sigma Clipping) - PixInsight.  Mure Denoise - PixInsight. Non-linear stretching, normalization and gradient removal - PixInsight.   Curves, Levels, Deconvolution, RGB combine, Luminance layering - PixInsight.  Final finishing  - Affinity Photo.  Photometric RGB calibration - PixInsight. Annotation - PixInsight, Aladin (Simbad and NED), and Affinity Photo. This image is a  LRGB with luminance layering.  Image processed at 6456x3520 resolution. Final Image size is approximately  4144x2822.

North is up in this image.  The face on spiral galaxy in NGC 5364, a  combination ring/spiral with one extended arm (the pec classification - SA(rs)bc pec). It is the namesake of an informal group named the "NGC 5364 Group"  nearby galaxies of similar distance and redshift are NGC 5338,5348,5356, and 5360 - the distance of NGC 5364 is 70 million light years  (by redshift estimate) and 57.4 million light years (by redshift independent estimate) . The Abell Galaxy Cluster, ACO 1809  is to the right and at a much further distance about 1.05 billion light years lookback time. Also, NGC 5364 was multiply observed / discovered and is a duplicate of NGC 5364 There are several quasars visible in this image with high redshifts (one at 3.400 with lookback time of 11.83 billion light years).   These objects, information, background galaxies and some of the brighter stars are identified in the annotated image. Horizontal FOV is approximately 39 arc minutes. Full size image scale is approximately 1.27 arcsec/pix.. This image replaces  an earlier image in the Archives here.

Image center is approximately - Equatorial 2000: RA: 13h 54m 38s Dec: +05 06' 47"



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