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NGC 3521 in Leo



Scope: Celestron 9.25 Edge HD 235 mm at f/7, Location: DAA Observatory, Shelter Valley, CA, 24 March and 1 April  2022  Camera: ASI294MM (Baader  LRGB Filters)

Exposure: Exposure: L - 64 x  4 minutes (gain-121, 2x2),  RGB - 24 x 2.5 min each filter (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. De-convolution - 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  3610x2418.

North is up in this image.  This is an image of the galaxy NGC 3521 and surrounding background galaxies. NGC 3521, SAB(rs)bc, is a flocculent galaxy having a "woolly" appearance rather than a grand design spiral. It has a trace of a bar with a weak inner ring and a moderate to loosely wound arm structure. It is about 50 million light years distant.  There are various Quasars  visible in this image - the greatest lookback time is 11.37 billion light years with a redshift of 2.794 These objects, information, and some of the brighter stars are identified in the annotated imageThis image replaces an earlier image that can be seen in the Archives here. Horizontal FOV is approximately 39 arc minutes. Full size image scale is approximately 0.65 arcsec/pix.. 

Image center is approximately - Equatorial 2000: RA: 11h 05m 47s Dec: -001'59"


All images and content remain the property of Jim Thommes - copyright 2003 - 2022

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