NGC 891 and Abell 347 Galaxy Cluster
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CLICK ON IMAGE FOR FULL SIZE VIEW (4115x2799) Scope: Explore Scientific MN152 at f/4.8, Location: DAA Observatory, Shelter Valley, CA, 6 and 30 September 2021 Camera: ASI294MM (Baader LRGB Filters) Exposure:
Exposure: L - 64 x 5 minutes (gain-150 2x2) , RGB - 20 each x 3 minutes
- (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, 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 4000x3000. North is up in this image. The
galaxy upper right is NGC 891 - a SA(s)b? edge-on galaxy. It's distance is
comparable by independent estimate (31.3 million light years) and by redshift estimate
(34.1
million light years). This image also shows the Abell 347 galaxy group in this region
of the sky. Group members include NGC 898, 906, 909, 910, 911, 912, 913, 914,
and 923. This field has numerous background galaxies which are visible in this image.
Some Quasars are also visible in this image as well. The visible Quasars range from
3.51 to 10.8 billion light years lookback. These objects,
information, background galaxies and some of the brighter stars are identified in the
annotated
image. Horizontal FOV is approximately 89 arc minutes. Full size
image scale is approximately 1.30 arcsec/pix.. Image center is approximately - Equatorial 2000: RA: 02h 24m 08s Dec: +42° 09' 34"
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