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Astronomy

Open Clusters

An open cluster is a type of star cluster made of up to a few thousand stars that were formed from the same giant molecular cloud and have roughly the same age. More than 1,100 open clusters have been discovered within the Milky Way galaxy, and many more are thought to exist. [1]
Astrophoto: Messier 35 and NGC 2158

Messier 35 and NGC 2158

Astronomy of Messier 35 and NGC 2158 Messier 35 and NGC 2158 are two open clusters in the constellation Twins. Messier 35 M35 is an open star cluster with about 500 stars and is about 100 million years old. Nearly all of these stars got that wonderful blue color, which is typical for young, hot stars. [2] NGC 2158 Cluster NGC 2158, in contrast, is an open star cluster with more than 10.000 stars and an age of more than one billion years [3], while the english Wikipedia describes it as about two billion years of age. [4] Object names and overview Open star cluster Messier 35 (left) and NGC 2158 (right) with two open star cluster in the background (IC 2157 and IC 2158). Distance and appearance of Messier 35 and NGC 2158 The distance from our solarsystem to Messier 35 is about 2.800 lightyears, while the distance to NGC 2158 is about 16200 Lightyears. [2] [3] The Cluster Messier 35 has got an apparent dimension of about 28 arc-minutes. The real size in diameter is about 24 lightyears. [2] The apparently smaller cluster, NGC 2158 has got an apparent dimension of only 5 arc-minutes and a diameter of about 16 lightyears. [4] ...
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M39

Messier 39

Messier 39 is, when it comes to the amount of stars, a small open star cluster. Only about 80 stars belong to Messier 39. [5] M39 belongs to the constellation Cygnus. M39 is also cataloged as NGC 7092. [5] The star cluster is less than 1000 lightyears away from our solar system. Its size is 7 lightyears and has an apparent dimension of 32' (arc minutes). [5] Screenshot from “Our Galaxy”. https://otherwise.comThe position of M39 to our sun. Other yellow dots are more open clusters from the Messier Catalog ...
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Messier 44 Beehive Cluster

Beehive Cluster – Messier 44

M44, the Beehive Cluster, is an open cluster in the constellation Cancer. M44 is the second brightest cluster in the Messier Catalog. Only the Pleiades are brighter. The really beautiful part is the combination of yellow and blue stars. Object Names The open cluster "Beehive Cluster" (M44, NGC 2632 or Cr 189) is part of the Milkyway and is about 577 lightyears away. The open cluster consists of about 350 stars. Messier 44 Beehive Cluster, apparent dimension The open Cluster M44 got an apparent dimension of about 95 arc-minutes. This makes the cluster nearly double as big as the full Moon. The real expanse is about 22,8 lightyears in diameter ...
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Messier 45 Pleiades

The Pleiades – Messier 45

Astronomy The Pleiades are an open cluster in the constellation Taurus. The Pleiades are also known as the "Seven Sisters". The Pleiades are not registered in the "New Global Catalog" and therefore they do not have a NGC number. But some of the reflection nebula inside the Pleiades are registered there. The Pleiades are a cluster of at least 500 to 1000 stars [6] and is about 125 million [7] years old. Part of the Pleiades are a couple of named stars: AlioneAtlasElectraMaiaMeropeTaygetaPleioneCelaenoAsteropeSterope II All these stars got that awesome blue color, indicating their hot temperature. Pleiades - object names The distance from our solarsystem to the Pleiades are 444 lightyears [7] and consists of about 500-1000 [6] stars.Part of the Pleiades are several reflection nebulae. The two biggest are the Merope Nebula (NGC 1435) in a distance of 440 lightyears and the Maia Nebula (NGC 1432) in a distance of about 359 lightyears to Earth. Pleiades - distance and appearance The Pleiades have got an apparent dimension of about 70 arc-minutes. The real size in diameter is about 35 lightyears. With these dimensions, the Pleiades are even larger on the nightsky than the Full Moon ...
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  1. https://en.wikipedia.org/wiki/Open_cluster 22/10/06[]
  2. Messier 35 – Wikipedia[][][]
  3. NGC 2158 – Wikipedia[][]
  4. NGC 2158 - Wikipedia[][]
  5. https://de.wikipedia.org/wiki/Messier_39[][][]
  6. Plejaden – Wikipedia[][]
  7. Pleiades - Wikipedia[][]

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