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Contains:  NGC 6207, M 13, Great Cluster in Hercules, NGC 6205
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M 13 - The Great Globular Cluster in Hercules, 





    
        

            Andrea Alessandrelli
M 13 - The Great Globular Cluster in Hercules

M 13 - The Great Globular Cluster in Hercules

Technical card

Resolution: 2000x1510

Dates:April 18, 2018April 19, 2018April 20, 2018April 22, 2018

Frames:
Baader Planetarium B-CCD 1.25": 20x120" -20C bin 1x1
Baader Planetarium G-CCD 1.25": 20x120" -20C bin 1x1
Baader Planetarium R-CCD 1.25": 20x120" -20C bin 1x1
Baader Planetarium UV-IR-CUT Filter - 1.25": 165x120" -20C bin 1x1

Integration: 7.5 hours

Darks: ~30

Flats: ~30

Bias: ~100

Avg. Moon age: 4.50 days

Avg. Moon phase: 22.73%

Bortle Dark-Sky Scale: 6.00

Astrometry.net job: 2039824

RA center: 250.427 degrees

DEC center: 36.455 degrees

Pixel scale: 1.489 arcsec/pixel

Orientation: 93.191 degrees

Field radius: 0.518 degrees

Locations: Home Backyard, Geleen, Limburg, Netherlands

Data source: Backyard

Description

I hope I'll be able to integrate a bit more data for colors, i'm sure it wont hurt :)

Comments

Author

Epox
Andrea Alessandrelli
License: None (All rights reserved)
2431
Like

Revisions

  • M 13 - The Great Globular Cluster in Hercules, 





    
        

            Andrea Alessandrelli
    Original
  • M 13 - The Great Globular Cluster in Hercules, 





    
        

            Andrea Alessandrelli
    C
  • M 13 - The Great Globular Cluster in Hercules, 





    
        

            Andrea Alessandrelli
    E
  • M 13 - The Great Globular Cluster in Hercules, 





    
        

            Andrea Alessandrelli
    F
  • M 13 - The Great Globular Cluster in Hercules, 





    
        

            Andrea Alessandrelli
    H
  • M 13 - The Great Globular Cluster in Hercules, 





    
        

            Andrea Alessandrelli
    I
  • M 13 - The Great Globular Cluster in Hercules, 





    
        

            Andrea Alessandrelli
    J
  • M 13 - The Great Globular Cluster in Hercules, 





    
        

            Andrea Alessandrelli
    K
  • M 13 - The Great Globular Cluster in Hercules, 





    
        

            Andrea Alessandrelli
    L
  • M 13 - The Great Globular Cluster in Hercules, 





    
        

            Andrea Alessandrelli
    M
  • M 13 - The Great Globular Cluster in Hercules, 





    
        

            Andrea Alessandrelli
    N
  • Final
    M 13 - The Great Globular Cluster in Hercules, 





    
        

            Andrea Alessandrelli
    P

C

Processed in PI and integrated colors

E

Applied a slight desaturation to the brightest stars and removed a couple of artifacts.

F

Removed a bluish background and contrast raised a bit.

H

Applied some SCNR denoise, removed a purple chrominance around the cluster and trying to boost the brightness of the fainter stars.

I

Recalibrated with photometric color calibration. Applied HDR multiscale to clip the core luminosity.

J

Removed a reddish/brown tone from the background and applied a bit more denoise to it. Resampled

K

I removed a wierd "cross" texture from the background and i'm trying to make the cluster more shiny. I like the result but I should try to address the problem of a central orange/brownish dot inside the smaller yellow stars. My guess is a wrong clipping during stacking, I will work on this issue and post the result ... if better than this! :)

L

Reprocessed. I will keep doing some minor adjustments now that i can easily confront it with the previous versions :)

M

An extra saturation on everything besides the bigger stars outside the cluster.

N

I adjusted the Hue of colors by moving the purple tones towards the blue and the yellows towards orange.

P

Reprocessed

Sky plot

Sky plot

Histogram

M 13 - The Great Globular Cluster in Hercules, 





    
        

            Andrea Alessandrelli