Messier 35 & NGC 2158 Open Star Clusters (Mirosław Stygar)

Celestial hemisphere: Northern · Constellation: Gemini (Gem) · Contains: M 35 · NGC 2158 · NGC 2168 · The star 3 Gem · The star 5 Gem

Messier 35 & NGC 2158 Open Star Clusters, Mirosław Stygar

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Messier 35 & NGC 2158 Open Star Clusters

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Messier 35 & NGC 2158 Open Star Clusters

While waiting for the main course of the evening, the Markarian Chain, I captured two appetizers - two clusters - M 35 along with its companion NGC 2158, and also the Double Cluster NGC 869 & NGC 884.

Such casual photographs, with just the stars, are always a good opportunity to expand knowledge because, let's face it, we would never hunt them down if they weren't a side target or if it wasn't due to a large moon phase.

The first image features the pair of clusters M 35 and NGC 2158. Here are a few sentences about each of them:

M 35 - also known as NGC 2168, is a relatively close open cluster in the western part of the Gemini constellation. Discovered independently by two astronomers - Philippe Loys de Chéseaux around 1745 and John Bevis before 1750. Leonard & Merritt in 1989 calculated its total mass using statistical techniques based on the proper motions of its stars. According to their calculations, it amounted to a maximum of 3200 solar masses. Its distance from Earth is 2970 light-years, and the estimated age of M 35 is about 110 million years. The hottest main sequence stars in the cluster have spectral classification B3. M 35 also contains more evolved stars, including several orange and yellow giants.

NGC 2158 - it lies in the immediate vicinity of the main star of the frame, but is not associated with it. This open cluster is located about 9,000 light-years further away, or over 12,000 light-years from the Earth observer. It is also much older, estimated to be around 2 billion years old. This is clearly visible when looking at the colors of its stars. It mainly consists of old yellow stars, as bright blue giants have already ended their lives. Similarly, M 35 will look like this in some time.

Poland

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Messier 35 & NGC 2158 Open Star Clusters

Messier 35 & NGC 2158 Open Star Clusters

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