Open Cluster NGC 2420
NGC 2420 was discovered on 19 November 1783 by the German-British astronomer Wilhelm Herschel with its 18.7 inch reflector. It is a Trumpler-type I2r open star cluster of about magnitude 8.3 visual magnitude. 
The open star cluster NGC 2420 (also known as Collinder 154, Melotte 69) has an estimated age of 2.5 ± 0.5 billion years. The parallax of the cluster determined from Gaia DR2 2018 gives a distance of 2.55 ± 0.5 kpc (about 8300 light years). There is little interstellar dust on the line of sight, resulting in little blushing of the starlight.  The cluster counts 685 ± 27 member stars within a radius of 20 arc minutes, which corresponds to about 12 pc (39 light years). The radius of the core is about 1.32 arc minutes. 
Open star cluster NGC 2420 is located in the constellation of Gemini, some 2° 15' east of the Eskimo Nebula (NGC 2392). The best viewing time is October to April.
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