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NGC 2158 is an open cluster in the constellation Gemini, half a degree away from the better known M 35. Its components are rather weak, around the twelfth magnitude.
The low luminosity of this cluster is justified by the great distance at which it is located, over 16,000 light years, that is on the outskirts of the Milky Way, on the Cygnus arm; therefore it also appears strongly obscured by interstellar dust which stands in the line of sight.
