Constellation Gemini Declination +24° 05.8′ Apparent magnitude (V) 8.6 | Right ascension 06 07 25 Distance 11,000+ ly Apparent dimensions (V) 5 arcmin | |
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NGC 2158 is an open cluster in the constellation of Gemini. It is located southwest of open cluster Messier 35, and is believed to be about 2 billion years old. The two clusters are unrelated, as NGC 2158 is around 9,000 light years further away than M35.
Once thought to be a globular cluster, NGC 2158 is now known to be an intermediate-age, metal-poor open cluster that is a member of the old thin disk population.
References
NGC 2158 Wikipedia(Text) CC BY-SA