NGC 2158

NGC 2158
NGC 2158 to the lower right of M35 Credit: 2MASS/NASA
Observation data (J2000 epoch)
Constellation	Gemini
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
Estimated age	~2 billion yrs
See also: Open cluster, List of open clusters

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.