NGC 5921 in Serpens
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CLICK ON IMAGE FOR FULL SIZE VIEW (4000x2714) Scope: Celestron 9.25 Edge HD 235 mm at f/7, Location: DAA Observatory, Shelter Valley, CA, 30 April and 3 May 2022, Camera: ASI294MM (Baader LRGB Filters) Exposure:
Exposure: L - 80 x 4 minutes (gain-121 2x2) , RGB - 20 each x 2.5 minutes
- (gain-121 2x2).
Processing: Data
Collection - Sequence Generator Pro (as FITs). Sub-frame calibration
- Pixinsight (WBPP). Sub-frame registration and integration (Average combine - Winsorized Sigma
Clipping) - PixInsight (WBPP). Mure Denoise - PixInsight. Non-linear stretching, normalization and
gradient removal - PixInsight. Curves, Levels, RGB combine, Luminance
layering - PixInsight. Generation of starless Luminance image for later
processing - StarXTerminator.
Photometric RGB calibration (SPCC) - PixInsight. De-convolution -
BlurXTerminator. Final finishing - Affinity Photo. 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 4000x2714. North is up in this image. The
dominant galaxy toward the left is NGC 5921 - an SB(r)bc morphology. It is
a barred spiral with
a strong ring. It's distance by independent estimate is 56.4 million light
years and by redshift estimate is 76 million light years. Background galaxies to
the right (PCG1277644, PGC1275985, and ASK 466800.0) are at very similar redshift distance
of 602 to 607 million light years. Other ASK cataloged galaxies in the
background are from 1,200 to 1,300 million light years. Quasars visible in this
image are from 5.05 to 11.1 billion years (Light Lookback). These objects,
information, background galaxies and some of the brighter stars are identified in the
annotated
image. This image replaces an earlier image that can be
seen in the Archives here.
Horizontal FOV is approximately 39.5 arc minutes. Full size
image scale is approximately 0.59 arcsec/pix. Image Center approximately - Equatorial 2000: RA: 15h 21m 54s Dec: +05°04'14"
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