NGC 467, NGC 470, NGC 474
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CLICK ON IMAGE FOR FULL SIZE VIEW (3260x2212) Scope: Celestron 9.25 Edge HD 235 mm at f/7, Location: DAA Observatory, Shelter Valley, CA, 24 October 2022, Camera: ASI294MM (Baader LRGB Filters) Exposure: L -
68 x 3.5 minutes (gain-150 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 3260x2212. North is up in this image. This image shows
three dominant galaxies - NGC 467, NGC 470, and NGC 474. Two galaxies, NGC 470 -
SA(rs)b and NGC 474 - SA0^0(s), form a galaxy pair - they have similar
velocities, redshift and distance estimates. Two galaxies, NGC 467 -
SA0^0(s) pec and NGC474 have peculiar shapes. These three galaxies range in
distance from 92 to 235 million light years. Two background galaxies
- PGC 4765 (88 million light years) and PGC 4755 (245 million light years)
are in the distance range of the three dominant galaxies. Other background
galaxies are further in estimated distance. The furthest objects are the Quasars and their distances range from 2.482 to
12.26 billion years (Lookback). These objects,
information, background galaxies, and some of the brighter stars are identified in the
annotated
image. Horizontal FOV is approximately 38.75 arc minutes. Full size
image scale is approximately 0.73 arcsec/pix. Image Center approximately - Equatorial 2000: RA: 01h 19m 46s Dec: +03°19'22"
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