NGC_1997
NGC_1997
Thực đơn
NGC_1997Liên quan
NGC 1997 NGC 1097 NGC 199 NGC 197 NGC 1907 NGC 1996 NGC 1979 NGC 1971 NGC 1974 NGC 1993Tài liệu tham khảo
WikiPedia: NGC_1997 http://cseligman.com/text/atlas/ngc19a.htm#1997 http://simbad.u-strasbg.fr/simbad/sim-id?Ident=NGC... http://spider.seds.org/ngc/ngc.cgi?CatalogNumber=n... https://ned.ipac.caltech.edu/cgi-bin/objsearch?obj...