NGC 2158
| NGC 2158 | |
|---|---|
| Observation data (J2000 epoch) | |
| Right ascension | 06h 07m 25s |
| Declination | +24° 05.8′ |
| Distance | 11,000+ ly |
| Apparent magnitude (V) | 8.6 |
| Apparent dimensions (V) | 5 arcmin |
| Physical characteristics | |
| Radius | 8 ly |
| Estimated age | ~2 billion yrs |
| Associations | |
| Constellation | Gemini |
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. The two clusters are unrelated, as the subject is around 9,000 light years further away.
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.