Dreyer's description of NGC 2420 in his New General Catalog (NGC):
"Cluster, considerably large, rich in stars, compressed, stars of magnitude 11 to 18."
Quote from: The Deep Sky Field Guide to Uranometria 2000, 2nd Ed:
"Open Cluster of approximately 300 stars, the brightest being magnitude 11. Moderately rich in stars; small brightness range; strong central concentration; detached from surrounding star field."
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George Normandin, KAS
May 14th, 2005