Harold Corwin

IC 106 = NGC 530. This "bug" arose because of bad timing. Bigourdan found the galaxy in November of 1887, just a year after Swift had first discovered it. Swift sent the discovery to Dreyer in a letter (from which it went into the NGC), then published the galaxy in his sixth list. Bigourdan also published the galaxy as a "nova" after the NGC appeared, but apparently did not realize that it was Swift's object because of the difference in RA. So, it got an IC number, too.

When Bigourdan went over the area again in 1897, he had completely forgotten his earlier observation, so remeasured the galaxy with respect to the same comparison star. This second time, he recognized that the object was the same one Swift had seen and gave it its NGC number in his list. He also noted the difference in RA.

Howe also caught the RA difference and published a corrected position in 1898. This appeared as a note in the second IC. Dreyer also added the identity to Howe's corrected RA.

Finally, MCG suggested that the galaxy was also IC 1696, but that is a different galaxy a few arcminutes southeast found by Howe.

― IC Notes by Harold Corwin

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