NGC 1554, Struve's Lost Nebula, is a list entry in the New General Catalogue

New General Catalogue

The New General Catalogue of Nebulae and Clusters of Stars is a well-known catalogue of deep sky objects in astronomy. It contains 7,840 objects, known as the NGC objects...

 of Nebulae compiled by John L. E. Dreyer, which was discovered by the German-Russian astronomer Otto Wilhelm von Struve

Otto Wilhelm von Struve

Otto Wilhelm von Struve was a Russian astronomer. In Russian, his name is normally given as Otto Vasil'evich Struve...

 and confirmed by Heinrich Louis d'Arrest

Heinrich Louis d'Arrest

Heinrich Louis d'Arrest was a German astronomer, born in Berlin. His name is sometimes given as Heinrich Ludwig 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

NGC 1555

NGC 1555, sometimes known as Hind's Variable Nebula, is a variable nebula, illuminated by the star T Tauri, located in the constellation Taurus. It is also in the second Sharpless catalog as 238. It is a Herbig–Haro object. -External links:*...

, Hind's Variable Nebula, but at NGC 1554:s coordinates, (epoch J2000) there is neither a nebula nor a star.