Harold Corwin

IC 3493 is probably a star. The situation is odd: Schwassmann has accurate positions for IC 3487 just west of IC 3493, and for a star just east. These agree to within a few arcsec of the modern positions.

However, for IC 3493 itself, Schwassmann's position is 2 seconds of time east, and 12 arcsec south of the star that he perhaps measured. Is there a defect superposed that pulled his position off? We may never know, as his plates are reported to be missing from the plate vaults in Heidelberg.

― IC Notes by Harold Corwin

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