Harold Corwin

IC 2983 is not NGC 4006 as some have supposed. Bigourdan found IC 2983 on the same night on which he observed NGC 4006, so the two cannot be identical. However, there is no object at the position estimated by Bigourdan for IC 2983: +10 sec and -6 arcmin from BD -1 2597. There are several stars near; one is mentioned in Bigourdan's description of NGC 4006. Two fainter stars are possible candidates as Bigourdan's object, but they are more than an arcminute away from his position.

In the end, I have chosen to simply say "Not found" for IC 2983. But the possibility remains that it is actually a star -- if so, it is probably unrecoverable, given the estimated position.

― IC Notes by Harold Corwin

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