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Contains:  NGC 1245, NGC 1528, NGC 1545, Part of the constellation Perseus (Per), The star 29Per, The star 31Per, The star 34Per, The star 43Per, The star Mirfak (αPer), The star δPer, The star ιPer, The star λPer, The star σPer, The star ψPer
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Melotte 20, 



    
        

            ThomasR
Melotte 20
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Melotte 20

Technical card


Dates:Aug. 6, 2018

Frames: 200x60" ISO800

Integration: 3.3 hours

Darks: ~20

Flats: ~20

Bias: ~200

Avg. Moon age: 23.94 days

Avg. Moon phase: 31.35%


Basic astrometry details

Astrometry.net job: 3257048

RA center: 3h 41' 39"

DEC center: +51° 19' 58"

Pixel scale: 8.769 arcsec/pixel

Orientation: 29.706 degrees

Field radius: 7.437 degrees


Resolution: 5082x3385

Locations: Balkon, Dresden, Sachsen, Germany

Data source: Backyard

Description

The open cluster Melotte 20, or Collinder 39, is one of my favorite objects. There was a strange gradient and high noise in the image which was hard to reduce without eliminating NGC 1491. I tried to reduce the smaller stars a bit more to isolate the star cluster.

Comments

Author

astro_willy
ThomasR
License: None (All rights reserved)
530
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Revisions

  • Melotte 20, 



    
        

            ThomasR
    Original
  • Final
    Melotte 20, 



    
        

            ThomasR
    F

F

Description: New processing; eliminate gradient with artificial flat method by Tommy Nawratil; former faint structure above NGC 1491 was problably a problem with DBE and no nebula

Sky plot

Sky plot

Histogram

Melotte 20, 



    
        

            ThomasR