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Astronomy

Open Clusters

Open clusters are groups of young stars that are loosely bound together by gravity. They typically contain anywhere from a few dozen to a few thousand stars, which are all thought to have formed from the same molecular cloud at roughly the same time.

Open clusters are often found in the disk of a galaxy, where the gas and dust necessary for star formation are concentrated. They are relatively young, with ages ranging from a few million to a few hundred million years. The stars in open clusters are typically more metal-rich and more diverse in age than the stars in globular clusters.

One of the defining features of open clusters is their irregular shape, with the stars spread out over a region that can span several tens of light-years. The stars in open clusters are also less densely packed than those in globular clusters, which allows astronomers to study them in more detail and to observe individual stars within the cluster.
C14 - Caldwell 14, Melotte 13 and Melotte 14

Caldwell 14

Caldwell 14, also known as the Double Cluster, is a stunning pair of open star clusters located in the constellation Perseus, appearing as two adjacent patches of light in the night sky and reaches its annual culmination at astronomical midnight around November 1st ...
Caldwell 16, Melotte 240, NGC 7243

Caldwell 16

Caldwell 16, a moderately bright and visually appealing open star cluster with a compact angular diameter, is situated in the constellation Lacerta in the northern hemisphere ...
Hyades - Caldwell 41

Caldwell 41 – Hyades

The Hyades is a prominent open star cluster located in the constellation Taurus, easily recognizable for its V-shaped arrangement of stars and its proximity to the red giant star Aldebaran ...
Caldwell 50 - Open Cluster inside the Rosette Nebula

Caldwell 50

NGC 2244, an open star cluster within the Rosette Nebula in the constellation Monoceros, captivates with its moderate brightness and active star formation within an extensive region sculpted by young, massive stars ...
Messier 103 - Melotte 8

Messier 103

Messier 103, a young open star cluster located in the constellation Cassiopeia, approximately 8,000 light-years away, encompasses a group of about 40 blue and white stars, reaching its annual culmination around astronomical midnight around October 19th ...
M29 - Messier 29 - NGC 6913

Messier 29

Messier 29 is an open star cluster located in the constellation Cygnus, notable for its relatively young stellar population ...
M34 - Messier 34 - Melotte 17 - NGC 1039

Messier 34

M34 is an open cluster in Perseus, reaching its annual culmination at astronomical midnight around November 5th ...
Messier 35 - M35

Messier 35

Messier 35 is an open star cluster located in the constellation Gemini, composed of over 200 stars ...
Open Starcluster M37 - Messier 37 - Melotte 38 - NGC 2099

Messier 37

M37 is an open cluster in the constellation Auriga, reaching its annual culmination at astronomical midnight around December 20th ...
Messier 39. M39

Messier 39

Messier 39 is an open star cluster located in the constellation of Cygnus, at a distance of approximately 800 light years from Earth ...
Open Starcluster Beehive Cluster - M44 - Messier 44 - Melotte 88 - NGC 2632

Messier 44 – Beehive Cluster

The open star cluster Messier 44 in the constellation of Cancer reaches its annual culmination around January 28th ...
Messier 45, M45, The Pleiades

Messier 45 – The Pleiades

The Pleiades are an open star cluster composed of young, hot stars and visible in the sky as part of the Taurus constellation ...
NGC 2158

NGC 2158

NGC 2158 is a distant and densely packed open star cluster located in the constellation Gemini, appearing as a faint and compact celestial grouping ...
NGC 6633

NGC 6633

NGC 6633 is an open star cluster located in the constellation Ophiuchus, approximately 880 light-years away from Earth ...
NGC 6939

NGC 6939

NGC 6939 is an open star cluster located in the constellation Cepheus, and it is notable for its concentration of stars ...

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