NGC_257
NGC_257
Thực đơn
NGC_257Liên quan
NGC 257 NGC 2506 NGC 2539 NGC 2775 NGC 2516 NGC 2857 NGC 247 NGC 2715 NGC 2782 NGC 2503Tài liệu tham khảo
WikiPedia: NGC_257 http://cseligman.com/text/atlas/ngc2a.htm#257 http://nedwww.ipac.caltech.edu/cgi-bin/nph-objsear... //doi.org/10.1086%2F498708 https://ui.adsabs.harvard.edu/abs/2006AJ....131.11...