NGC 5371 and Hickson 68
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CLICK ON IMAGE FOR FULL SIZE VIEW (4144x2822) Scope: Celestron 9.25 Edge HD 235 mm at f/7, Location: DAA Observatory, Shelter Valley, CA, 9 April and 3 May 2021 Camera: ASI294MM (Baader LRGB Filters) Exposure:
Exposure: L - 64 x 4 minutes (gain-121 2x2) , RGB - 40(R), 33(G), 20(B)x 3 minutes
- ( all RGB gain-121 2x2).
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 4144x2822 resolution. Final
Image size is approximately 4144x2822. North is up in this image. Upper
left galaxy is NGC 5371, a weakly barred spiral with ring and spiral arm
features. The compact galaxy group Hickson 68 is to the right. The Hickson group
contains NGC 5353, 5354, 5350, 5355, and 5358. NGC 5350 is a strongly barred
spiral with ring. A small spiral, UGC 8841 is in the lower part of the image.
All of these galaxies are in the same distance range 115 to 126 million light
years by redshift estimate. There are several quasars in this image with high
redshifts (up to 2.585 with lookback time of 11 billion light
years). These objects,
information, 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 0.56 arcsec/pix.. This image replaces an
earlier image in the Archives here. Image center is approximately - Equatorial 2000: RA: 13h 54m 32s Dec: +40°21'18"
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