Hemisphere:  Northern  ·  Constellation: Canes Venatici (CVn)  ·  Contains:  M 3  ·  NGC 5272
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M3 Globular Cluster, 



    
        

            Ulli_K
M3 Globular Cluster
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M3 Globular Cluster

Technical card

Imaging telescopes or lenses: Vixen Newton R200SS f/4

Imaging cameras: Canon 6D Modified Canon 6Da

Mounts: Losmandy G9

Software: Pleiades Pixinsight 1.8.6 Ripley

Accessory: Lacerta MGEN 2 at 8x50 finder


Dates:April 21, 2020

Frames: 45x480" ISO199

Integration: 6.0 hours

Darks: ~10

Flats: ~15

Bias: ~30

Avg. Moon age: 28.08 days

Avg. Moon phase: 2.35%

Temperature: 9.00


Astrometry.net job: 3477867

RA center: 13h 42' 10"

DEC center: +28° 22' 48"

Pixel scale: 1.696 arcsec/pixel

Orientation: 273.273 degrees

Field radius: 0.433 degrees


Resolution: 1300x1300

Locations: Garten, Schwäbisch Gmünd, Germany

Data source: Traveller

Description

My first globlar cluster. I was not sure what to expect. The center is so bright that I had to reduce the ISO to 200 to avoid overexposure of the center during the 8min subs.
I did the processing in Pixinsight. It was difficult to get the right star masks. I had to use a combination of two masks to cover the bright and the faint stars. Deconvolution was important to sharpen the center with all the tiny little stars. I'm surprised about the different colours of the stars.

The season for the globulars has just started.
Subs for M53 and M5 are already taken and M13 and M92 are going to come ...

Comments

Revisions

  • M3 Globular Cluster, 



    
        

            Ulli_K
    Original
  • M3 Globular Cluster, 



    
        

            Ulli_K
    B
  • Final
    M3 Globular Cluster, 



    
        

            Ulli_K
    C

B

Description: New version with optimised (darker) background

Uploaded: ...

C

Description: New version with processing from scratch. I aligned the RGB channels and used to the RepairHSV Script to getter better images of the stars right at the beginning. Much more effort was used for Deconvolution. This helped to get the stars resolved in the center. Star masking was quite challenging. I hope you like it! Well, a look with "fresh eyes" this morning showed that the faint stars in the outer part were wiped away by noise reduction. This was better in the first version. It seems I'm not yet finished with these data ...

Uploaded: ...

Sky plot

Sky plot

Histogram

M3 Globular Cluster, 



    
        

            Ulli_K