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Open Cluster

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. 1

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 2, while the english Wikipedia describes it as about two billion years of age. 3

Object names and overview

Overview M35 and NGC 2158
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. 1 2

The Cluster Messier 35 has got an apparent dimension of about 28 arc-minutes. The real size in diameter is about 24 lightyears. 1

The apparently smaller cluster, NGC 2158 has got an apparent dimension of only 5 arc-minutes and a diameter of about 16 lightyears. 3



  1. Messier 35 – Wikipedia[][][]
  2. NGC 2158 – Wikipedia[][]
  3. NGC 2158 – Wikipedia[][]

Astrophotograph