M61 in Virgo
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CLICK ON IMAGE FOR FULL SIZE VIEW (4132x2811) Scope: Celestron 9.25 Edge HD 235 mm at f/7, Location: DAA Observatory, Shelter Valley, CA, 24 1 and 5 April 2022 Camera: ASI294MM (Baader LRGB Filters) Exposure:
Exposure: L - 67 x 4 minutes (gain-121, 2x2),
RGB - 20 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 4132X2811 North is up in this image. This
is an image of the galaxy M61 and some nearby neighbors. M61, SAB(rs)bc, is a
Seyfert type 2 galaxy . It is a weakly barred with a suggestion of a ring
structure and a moderate to loosely wound arm swhich look somewhat irregular. It is about
40-46 million light years distant and a member of the Virgo Cluster. NGC
4292, NGC 4301, and UGC 7411 galaxies are noticeably visible and also Virgo
Custer members. Interestingly , NGC 4301 is superimposed in the
foreground of the 4 member compact galaxy group SDSSCGB 20312. There are various Quasars visible
ranging lookback time from 6.75 to 11.37 billion light years. 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 0.57 arcsec/pix..
Image center is approximately - Equatorial 2000: RA: 12h 21m 52s Dec: 04°11'32"
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