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Open clusters are very different from globular clusters. Unlike the spherically distributed globulars, they are confined to the galactic plane , and are almost always found within spiral arms . They are generally young objects, up to a few tens of millions of years old, with a few rare exceptions as old as a few billion years, such as Messier ...
The largest clusters can have over 10 4 solar masses, with the massive cluster Westerlund 1 being estimated at 5 × 10 4 solar masses and R136 at almost 5 x 10 5, typical of globular clusters. [27] While open clusters and globular clusters form two fairly distinct groups, there may not be a great deal of intrinsic difference between a very ...
Alter (open star clusters) (for example: Alter 1 at 0:31:56.9 / +63°09'47" in Cassiopeia) (Alter 1 = King 14 = Alter Cluster) Alves / Yun (open star clusters) AM — Arp-Madore catalogue of open and globular star clusters (Halton Arp / Barry F. Madore) (for example: Arp-Madore 1 in Horologium, Arp-Madore 2 in Puppis) An — Anderson (double stars)
Globular cluster masses can be determined by observing the proper motion of nearby stars influenced by the cluster [1] [2] or by estimating the cluster's relaxation time. [ 3 ] Open clusters
Globular cluster: Nearest globular cluster to the Earth. Also the first globular cluster known to have exoplanets (PSR B1620-26b) Messier 12: 74.4 [28] Messier 70: 68 [29] NGC 290: 66 [30] Open cluster: Messier 28: 60 [31] Globular cluster: Messier 18: 52.4 [32] Open cluster: The following notable star clusters are listed for the purpose of ...
A central velocity dispersion refers to the σ of the interior regions of an extended object, such as a galaxy or cluster. The relationship between velocity dispersion and matter (or the observed electromagnetic radiation emitted by this matter) takes several forms – specific correlations – in astronomy based on the object(s) being observed.
The Messier catalogue comprises nearly all of the most spectacular examples of the five types of deep-sky object – diffuse nebulae, planetary nebulae, open clusters, globular clusters, and galaxies – visible from European latitudes. Furthermore, almost all of the Messier objects are among the closest to Earth in their respective classes ...
The first known globular cluster, now called M 22, was discovered in 1665 by Abraham Ihle, a German amateur astronomer. [4] [5] [6] The cluster Omega Centauri, easily visible in the southern sky with the naked eye, was known to ancient astronomers like Ptolemy as a star, but was reclassified as a nebula by Edmond Halley in 1677, [7] then finally as a globular cluster in the early 19th century ...