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Contains:  Double cluster, NGC 869, NGC 884, NGC 957, The star 7Per, The star 8Per, The star 9Per
Double Cluster In Perseus NGC 869 - NGC 884, 



    
        

            Lluis Romero Ventura
Double Cluster In Perseus NGC 869 - NGC 884
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Double Cluster In Perseus NGC 869 - NGC 884

Technical card

Dates:Sept. 1, 2013

Frames: 40x60" bin 0x0

Integration: 0.7 hours

Avg. Moon age: 25.81 days

Avg. Moon phase: 14.84%


Basic astrometry details

Astrometry.net job: 98819

RA center: 2h 20' 36"

DEC center: +57° 9' 18"

Pixel scale: 9.188 arcsec/pixel

Orientation: -167.156 degrees

Field radius: 2.376 degrees


Resolution: 1500x1104

Description

The Double Cluster (also known as Caldwell 14) is the common name for the naked-eye open clusters NGC 869 and NGC 884 (sometimes designated h Persei and χ Persei, respectively, but those designations would really apply to both clusters and to a visually nearby star, which are close together in the constellation Perseus. NGC 869 and NGC 884 both lie at a distance of 7500 light years.

NGC 869 has a mass of 3700 solar masses and NGC 884 weighs in at 2800 solar masses; however, later research has shown both clusters are surrounded with a very extensive halo of stars, with a total mass for the complex of at least 20,000 solar masses.

Based on their individual stars, the clusters are relatively young, both 12.8 million years old In comparison, the Pleiades have an estimated age ranging from 75 million years to 150 million years. There are more than 300 blue-white super-giant stars in each of the clusters. The clusters are also blueshifted, with NGC 869 approaching Earth at a speed of 39 km/s (24 mi/s) and NGC 884 approaching at a similar speed of 38 km/s (24 mi/s). Their hottest main sequence stars are of spectral type B0

Comments

Author

Astrosirius
Lluis Romero Ventura
License: None (All rights reserved)
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Double Cluster In Perseus NGC 869 - NGC 884, 



    
        

            Lluis Romero Ventura