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Open cluster in the constellation Gemini From Wikipedia, the free encyclopedia
NGC 2158 is an open cluster in the constellation of Gemini. It is, in angle, immediately southwest of open cluster Messier 35, and is believed to be about 2 billion years old.[2] The two clusters are unrelated, as the subject is around 9,000 light years further away.
NGC 2158 | |
---|---|
Observation data (J2000 epoch) | |
Right ascension | 06h 07m 25s[1] |
Declination | +24° 05.8′[1] |
Distance | 11,000+ ly[2] |
Apparent magnitude (V) | 8.6[1] |
Apparent dimensions (V) | 5 arcmin[2] |
Physical characteristics | |
Radius | 8 ly |
Estimated age | ~2 billion yrs[2] |
Associations | |
Constellation | Gemini |
Once thought to be a globular cluster, it is now known to be an intermediate-age, metal-poor open cluster that is a member of the old thin disk population.[2]
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