Double Cluster

h/χ Persei
The Double Cluster (also known as Caldwell 14) is the common name for the open clusters NGC 869 and NGC 884 (often designated h Persei and χ Persei, respectively), which are close together in the constellation Perseus.wikipedia
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Open cluster

open star clusterstar clusteropen clusters
The Double Cluster (also known as Caldwell 14) is the common name for the open clusters NGC 869 and NGC 884 (often designated h Persei and χ Persei, respectively), which are close together in the constellation Perseus.
Some others, such as the Double Cluster, are barely perceptible without instruments, while many more can be seen using binoculars or telescopes.

NGC 869

h Persei869h
The Double Cluster (also known as Caldwell 14) is the common name for the open clusters NGC 869 and NGC 884 (often designated h Persei and χ Persei, respectively), which are close together in the constellation Perseus.
It is the westernmost of the Double Cluster with NGC 884.

Perseus (constellation)

PerseusPerseus constellationPer
The Double Cluster (also known as Caldwell 14) is the common name for the open clusters NGC 869 and NGC 884 (often designated h Persei and χ Persei, respectively), which are close together in the constellation Perseus.
The Double Cluster, comprising two open clusters quite near each other in the sky, was known to the ancient Chinese.

NGC 884

χ Persei884Chi Persei
The Double Cluster (also known as Caldwell 14) is the common name for the open clusters NGC 869 and NGC 884 (often designated h Persei and χ Persei, respectively), which are close together in the constellation Perseus.
It is the easternmost of the Double Cluster with NGC 869.

RS Persei

RS
NGC 884 includes five prominent red supergiant stars, all variable and all around 8th magnitude: RS Persei, AD Persei, FZ Persei, V403 Persei, and V439 Persei.
RS Persei is a red supergiant variable star located in the Double Cluster in Perseus.

Caldwell catalogue

CaldwellCaldwell objectCaldwell 106
The Double Cluster is not included in Messier's catalog, but is included in the Caldwell catalogue of popular deep-sky objects.
While the Messier catalogue is used by amateur astronomers as a list of deep-sky objects for observation, Moore noted that Messier's list was not compiled for that purpose and excluded many of the sky's brightest deep-sky objects, such as the Hyades, the Double Cluster (NGC 869 and NGC 884), and the Sculptor Galaxy (NGC 253).

Red supergiant star

red supergiantred supergiantsRed
NGC 884 includes five prominent red supergiant stars, all variable and all around 8th magnitude: RS Persei, AD Persei, FZ Persei, V403 Persei, and V439 Persei.
For example, in the substantial Double Clusters in Perseus there is just a single red supergiant, S Persei, while the massive Hodge 301 cluster in the Tarantula Nebula contains three.

Pleiades

Pleiades star clusterThe PleiadesPleiades cluster
In comparison, the Pleiades have an estimated age ranging from 75 million years to 150 million years.

Blueshift

blue shiftblue-shiftedblue-shift
The clusters are also blueshifted, with NGC 869 approaching Earth at a speed of 39 km/s and NGC 884 approaching at a similar speed of 38 km/s.

Stellar classification

spectral typeK-typeG-type
Their hottest main sequence stars are of spectral type B0.

Zeus

JupiterCronidesZeus Chrysaoreus
Perseus was born the son of the Greek god Zeus.

William Herschel

HerschelSir William HerschelWilliam
In the early 19th century William Herschel was the first to recognize the object as two separate clusters.

Circumpolar star

circumpolarcircumpolar stars(astral) square
The Double Cluster is circumpolar (continuously above the horizon) from most northern temperate latitudes.

Cassiopeia (constellation)

CassiopeiaCassiopeia constellationCassiopea
It is in proximity to the constellation Cassiopeia.

Radiant (meteor shower)

radiantradiant pointradiate
The Double Cluster is approximately the radiant of the Perseid meteor shower, which peaks annually around August 12 or 13.

Perseids

Perseid meteor showerPerseidPerseid meteors
The Double Cluster is approximately the radiant of the Perseid meteor shower, which peaks annually around August 12 or 13.

S Persei

S
S Persei is a red supergiant located near the Double Cluster in Perseus, north of the cluster NGC 869.

NGC 1850

1850
NGC 1850 is a double cluster and a super star cluster in the Dorado constellation, located in the Large Magellanic Cloud at the distance of 168,000 ly (51,510 pc).

William P. Bidelman

William Pendry Bidelman
For his 1943 dissertation, Bidelman reported the Double Cluster in the I Persei association is physically associated with neighborhood supergiant stars, and is part of an association of O- and B-type stars, and designated 47 stars as its members.

List of largest stars

largest known starslargest starslargest stars known

V520 Persei

V520 Per
V520 Persei is a blue supergiant member of NGC 869, one of the Perseus Double Cluster open clusters.

T Persei

It varies in brightness between magnitudes 8.3 and 9.7 and is considered to be a member of the Double Cluster.