NGC 3521 in Leo
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CLICK ON IMAGE FOR FULL SIZE VIEW (3600x2418) 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
image. This 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: -0°01'59"
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