NGC 251
NGC 251
Thực đơn
NGC 251Liên quan
NGC NGC 5195 NGC 4302 NGC 4993 NGC 404 NGC 4889 NGC 6822 NGC 2392 NGC 6397 NGC 4298Tài liệu tham khảo
WikiPedia: NGC 251 http://nedwww.ipac.caltech.edu/cgi-bin/nph-objsear... http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=... //doi.org/10.1086%2F498708 https://ui.adsabs.harvard.edu/abs/2006AJ....131.11... https://archive.org/details/sim_astronomical-journ...