Hemisphere:  Northern  ·  Constellation: Perseus (Per)  ·  Contains:  NGC 869  ·  NGC 884  ·  The star 7Per  ·  chi Persei Cluster  ·  h Persei Cluster
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Double Star Cluster, 



    
        

            Emanuele La Barbera
Double Star Cluster
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Double Star Cluster

Getting plate-solving status, please wait...
Double Star Cluster, 



    
        

            Emanuele La Barbera
Double Star Cluster
Powered byPixInsight

Double Star Cluster

Technical card

Imaging telescopes or lenses: SkyWatcher Newton 130/650 Blackdiamond

Imaging cameras: Canon 1300D (modified)

Mounts: Skywatcher HEQ 5 Rowan bel mod

Guiding telescopes or lenses: Omegon Achromat 80/400

Guiding cameras: ZWO ASI 120 MC Color

Software: Adobe Lighroom  ·  PixInsight 1.8 Ripley PixInsight

Accessory: ZWO ASI Air Pro  ·  Baader Planetarium 2" Mark III Mulitpurpose Coma Corrector MPCC


Dates:Oct. 10, 2020

Frames: 56x240" (3h 44') ISO800 bin 1x1

Integration: 3h 44'

Avg. Moon age: 22.62 days

Avg. Moon phase: 44.99%

Bortle Dark-Sky Scale: 3.00

Mean SQM: 21.40

Temperature: 10.00


Basic astrometry details

Astrometry.net job: 3921576

RA center: 2h 20' 30"

DEC center: +57° 7' 19"

Pixel scale: 0.679 arcsec/pixel

Orientation: 356.874 degrees

Field radius: 0.929 degrees


Resolution: 8060x5680

Locations: Borgo Schirò, Corleone, Monreale, Italy

Data source: Traveller

Description

h + χ Per, known as the double cluster of Perseus, is a pair of two very bright open clusters, visible in the constellation of Perseus. With an apparent magnitude of 4.3-4.4, it is known as far back as 130 BC. Under a fairly dark sky, it is possible to observe it with the naked eye without difficulty. In our eyes, the cluster appears almost like an "8" traced in the sky, with a non-stellar nature.

Both clusters h + χ Per (known by the abbreviations NGC 869 and NGC 884) are located in the arm of Perseus, immediately outside the arm of Orion, where the solar system is located. The distance from the Earth is about 7200-7500 light years and although from the Earth they seem very close to each other, in reality the two clusters are 800 light years apart.

In the two clusters, especially for NGC 869, there are several orange and above all blue stars, which allows us to estimate an age between 19 and 12.5 million years for both formations.

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