NGC 1554, Struve's Lost Nebula, is a list entry in the New General Catalogue of Nebulae compiled by John L. E. Dreyer, which was discovered by the German-Russian astronomer Otto Wilhelm von Struve and confirmed by Heinrich Louis d'Arrest. Dreyer describes it as
- !!! var, S, R, Nn = *13
which in NGC:s encoding is expanded to
- a magnificent or otherwise interesting object, variable, small, round, nucleus north of a star of the 13:th magnitude
The identification is uncertain: many sources think it is related to NGC 1555, Hind's Variable Nebula, but at NGC 1554:s coordinates, (epoch J2000) 04h 22m 00.0s +19° 36′ 00″ there is neither a nebula nor a star.
- www.DavidDarling.info: Struve’s Lost Nebula (NGC 1554)