Hemisphere:  Northern  ·  Constellation: Canes Venatici (CVn)  ·  Contains:  M 106  ·  NGC 4217  ·  NGC 4220  ·  NGC 4248  ·  NGC 4258  ·  NGC 4346
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M 106, NGC 4217 galaxy group, 



    
        

            Alan Brunelle
M 106, NGC 4217 galaxy group
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M 106, NGC 4217 galaxy group

Getting plate-solving status, please wait...
M 106, NGC 4217 galaxy group, 



    
        

            Alan Brunelle
M 106, NGC 4217 galaxy group
Powered byPixInsight

M 106, NGC 4217 galaxy group

Imaging telescopes or lenses: Celestron RASA 11

Imaging cameras: QHYCCD QHY268c

Mounts: Celestron CGX-L

Guiding telescopes or lenses: Agena Astro Finder Scope

Guiding cameras: ZWO ASI 120 MM Mini

Software: Nighttime Imaging 'N' Astronomy  ·  Celestron CPWI Telescope Control  ·  IrfanView  ·  Pleiades Astrophoto PixInisight 1.8 Ripley (x64)  ·  Cartes du ciel  ·  PHD2

Filters: Optolong L-Pro 2"

Accessory: Celestron Motor Focuser  ·  Baader Planetarium RASA 11 UFC system with 2" filter slider


Dates:April 6, 2021

Frames: 129x120" (4h 18')

Integration: 4h 18'

Avg. Moon age: 24.25 days

Avg. Moon phase: 28.37%


Astrometry.net job: 4471389

RA center: 12h 18' 57"

DEC center: +47° 22' 40"

Pixel scale: 1.252 arcsec/pixel

Orientation: 352.127 degrees

Field radius: 1.301 degrees


Resolution: 6231x4138

Data source: Backyard

Description

Oft imaged grouping of galaxies. Certainly M 106 is the standout, but my favorite is the almost perfectly symmetrical and perfectly edge on NGC 4217. A bit chunky for a spiral, so this galaxy may well be on its way to be a lenticular galaxy, though it is listed as a spiral. Thicker spiral galaxies, at least in the nucleus regions, are supposed to be correlative of the size of the super massive BH at their centers. The bigger the bulge, the bigger the BH. In any case, the perfectness of the edge on of this galaxy attracted the attention of Hubble, for the purpose of studying the distribution of molecular clouds in spiral galaxies. I suggest you take a look at the Hubble photos of this, they are spectacular. I will need a longer fl telescope for that!

My background on this seems to be a bit noisy. I may try to deal with that in a revision. As soon as I have some time.

Comments

Revisions

  • M 106, NGC 4217 galaxy group, 



    
        

            Alan Brunelle
    Original
  • M 106, NGC 4217 galaxy group, 



    
        

            Alan Brunelle
    B
  • Final
    M 106, NGC 4217 galaxy group, 



    
        

            Alan Brunelle
    C

B

Description: Was wanting to correct a strong red cast in the original upload. Oddly, for some reason PI photometric color calibration could not solve this field, even though plate solving and rendering worked great. So I winged it. But given a bit of time to catch up on this, here is what I expect to be the real final version.

Uploaded: ...

C

Description: In being self-critical with some of my recent galaxy images, I have embarked on some revisions. For this one, I have decided that the previous image was probably overly stretched and over contrast enhanced to the extent that M 106's outer disk is rather misrepresented as more dense and detailed than it is relative to the inner region. In doing so, the finer detail within that inner disk was lost to view. My guide was simply my unstretched subs and stack along with other's images. So I am presenting a heavily reprocessed image as the final. For this, I back way out and redid the stacking, taking advantage of doing a false-luminance stack to improve resolution. But in the end, with a more subtle processing hand, I think that my noise reduction also benefitted. This revision does not go as deep as the original, but seeing all the tiny red fuzzies that are there in the original stack kind of misses the point. And I cannot stand the artifacts generated otherwise. There are still a few point-like artifacts in M 106 that were generated with deconvolution, but cannot really be seen unless in full mag view. So don't do that! In the end, not nearly as dramatic, but then probably more true to M 106. And I much prefer the new 4217 as well as the other smaller galaxies. I believe that I can see more detail in there.

Uploaded: ...

Sky plot

Sky plot

Histogram

M 106, NGC 4217 galaxy group, 



    
        

            Alan Brunelle