spiral galaxy in the constellation Andromeda
via Wikipedia infobox
NGC 21 (also known as NGC 29) is a spiral galaxy in the Andromeda constellation. It was discovered by German-British astronomer William Herschel on 26 November 1790. Lewis Swift observed it again in 1885, leading to its double listing in the New General Catalogue.
NGC 7831 Group
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).