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Contains:  NGC 1245, Part of the constellation Perseus (Per), The star 29Per, The star 31Per, The star 34Per, The star 36Per, The star Mirfak (αPer), The star δPer, The star σPer, The star ψPer
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Melotte 20 - The Alpha Persei Cluster, 


            K. Schneider
Melotte 20 - The Alpha Persei Cluster
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Melotte 20 - The Alpha Persei Cluster

Technical card

Dates:Jan. 19, 2017

Frames: 20x180" ISO800

Integration: 1.0 hours

Darks: ~12

Flats: ~20

Bias: ~20

Avg. Moon age: 21.76 days

Avg. Moon phase: 54.14%

Temperature: -3.00

Basic astrometry details job: 1506538

RA center: 3h 30' 54"

DEC center: +49° 1' 15"

Pixel scale: 7.885 arcsec/pixel

Orientation: 351.076 degrees

Field radius: 4.180 degrees

Resolution: 2365x2995


Melotte 20 / Collinder 39, better known as the Alpha Persei Moving Group, is one of the nicest views with naked eyes or small binoculars at a dark site. Alpha Persei (Mirfak) lies at the NW edge of a cloud of silvery glitter, which resolves easily even in the smallest bino into an assembly of mostly bluish-white B-type stars, arranged in a conspicuous S-shape. Mirfak, the brightest member, has a creamy-white look. The one orange-tinted star along the southern reach of the S-curve, Sigma Per, is not a member of the group, but a foreground star at half the distance.

Final Version B with some more colour saturation.



K. Schneider
License: None (All rights reserved)


  • Final
    Melotte 20 - The Alpha Persei Cluster, 


            K. Schneider

Sky plot

Sky plot


Melotte 20 - The Alpha Persei Cluster, 


            K. Schneider