M106 in Canes Venatici
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CLICK ON IMAGE FOR FULL SIZE VIEW (4613x3481) Scope: FSQ-106N at f/8- w/ Q-Telex (Celestron EdgeHD 9.25 at f/7 for Ha), Location: DAA Observatory, Shelter Valley, CA, 2 and 4 April 2022 Cameras: ASI1600M (Astronomik Gen 2 LRGB Filters) ASI294M (Baader Ha Filter) Exposure:
Exposure: L - 66 x 4 minutes (gain-139 1x1), Ha - 40 x 3.5 minutes (
gain-180 2x2), RGB - 20 x 2.5 minutes each
- (gain-100 1x1).
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. Starless image generation of Ha and
Luminance images - Star XTerminator. Synthetic Luminance is created from a blend
of Luminance starless, Ha starless, and Luminance unscreened stars stopped down
to reduce star bloat - PixInsight. RGB combine, Luminance
layering - PixInsight. Ha starless is blended into the Red channel - RGB
stars are preserved - PixInsight. Final finishing - Affinity Photo.
Annotation - PixInsight - Aladin (Simbad and NED), and Affinity
Photo. This image is a LRGB with luminance layering. Image processed at
4656x3520 resolution. Final
Image size is approximately 4613x3481. North is to the
right in this image. The dominant spiral galaxy
is M106 (NGC 4258) - it is a Seyfert type 2 galaxy classified as SAB(s)bc. An
interesting feature is the faint Hydrogen-Alpha "jet" type structure
rising out of the galaxy disc. This feature is not discernable in an image
captured with broadband filters. It is at a distance of about 24 million light
years. Other galaxies seen in this image are NGC 4217, 4220, 4226, 4231,
4232, 4238. Numerous background galaxies are also seen in this image. One
background galaxy is quite distant at about 5.389 billion light years with a
redshift of 0.57557. There are more distant Quasars visible in this image -
the furthest has a redshift estimated look back time of 11.34 billion light
years. These objects,
information, background galaxies and some of the brighter stars are identified in the
annotated
image. Horizontal FOV is approximately 77 arc minutes. Full size
image scale is approximately 1.0 arcsec/pix.. This image replaces an
earlier image in the Archives here. Image center is approximately - Equatorial 2000: RA: 12h 17m 58s Dec: +47° 28' 43"
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