Harold Corwin

This is the only one of five "nebulae" that Juan Thome found while assembling the Cordoba Durchmusterung that may be an actual deep sky object. The others (IC 229, 1203, 1207, and 1290, which see) are either asterisms or do not exist. IC 1023 may be a small cluster of about 20 stars, but it could also be just a chance superposition of unrelated stars. Proper motions, spectra, and photometry will be needed to determine the true character of the grouping. In any event, Thome's position is good.

― IC Notes by Harold Corwin

Object Note

While the appearance is suggestive of a cluster, examining Gaia DR2 data shows a wide range of parallax values for the constituent stars, ranging from 0.5-3, proper motions are likewise divergent particularly in RA, this is unlikely to be a physical cluster

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