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NGC 2158, also known as OCL 468, Lund 206 or Melotte 40, it is an open cluster of stars located around 11,000 light years (3600 ±400 pc) from Earth in the constellation of Gemini. It is of intermediate age being around 2 billion years old. The cluster is populous with stars containing some 3000 ±69 stars within a radius of about 8 light years.
It is, in angle, immediately southwest of open cluster Messier 35. The two clusters are unrelated, as the subject is around 9,000 light years further away.
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Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).