NGC 1617 - NGC 1618 - NGC 1619 - NGC 1620 - NGC 1621
引用
^Your NED Search Results. ned.ipac.caltech.edu. [2022-06-26]. (原始内容存档于2022-06-26).
^The NGC / IC Project - Home of the Historically Corrected New General Catalogue (HCNGC) since 1993. web.archive.org. 2016-03-26 [2022-06-26]. 原始内容存档于2016-03-26.