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Contains:  M 13, Great Cluster in Hercules, NGC 6205
Getting plate-solving status, please wait...
M13 RGB Only, 





    
        

            Kevin Morefield
M13 RGB Only

M13 RGB Only

Technical card

Resolution: 4096x2304

Dates:June 11, 2019

Frames:
Astrodon Blue: 12x300" -30C bin 1x1
Astrodon Green: 13x300" -30C bin 1x1
Astrodon Red: 14x300" -30C bin 1x1

Integration: 3.2 hours

Darks: ~20

Flats: ~20

Bias: ~20

Avg. Moon age: 8.74 days

Avg. Moon phase: 64.20%

Bortle Dark-Sky Scale: 3.00

Astrometry.net job: 2752460

RA center: 250.422 degrees

DEC center: 36.460 degrees

Pixel scale: 0.728 arcsec/pixel

Orientation: 349.296 degrees

Field radius: 0.475 degrees

Locations: Sierra Remote Observatory, Auberry, California, United States

Data source: Own remote observatory

Remote source: Sierra Remote Observatories

Description

Star Clusters are a different processing challenge to be sure. With globulars, I've found the challenge is to resolve and maintain star color in the core. I've tried M13 several times in the past, mostly using short exposures to try and keep from saturating stars.

My approach this time was to not shoot Luminance and use fairly long, 5 minute RGB subs only. I then stretched the same data twice. Once very dimly for the core and once more normally for the rest of the image. These were blended with a luminance mask in Photoshop.

Comments

Author

morefield
Kevin Morefield
License: None (All rights reserved)
2653
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Revisions

  • M13 RGB Only, 





    
        

            Kevin Morefield
    Original
  • M13 RGB Only, 





    
        

            Kevin Morefield
    B
  • M13 RGB Only, 





    
        

            Kevin Morefield
    C
  • Final
    M13 RGB Only, 





    
        

            Kevin Morefield
    D

B

A touch of unsharp masking

C

curves

D

curves

Sky plot

Sky plot

Histogram

M13 RGB Only, 





    
        

            Kevin Morefield