Thực đơn
NGC_492Thực đơn
NGC_492Liên quan
NGC 492 NGC 4993 NGC 4298 NGC 4274 NGC 495 NGC 4026 NGC 4278 NGC 4293 NGC 4242 NGC 496Tài liệu tham khảo
WikiPedia: NGC_492 http://www.astronomy-mall.com/Adventures.In.Deep.S... http://cseligman.com/text/atlas/ngc4a.htm#492 http://ned.ipac.caltech.edu/cgi-bin/nph-objsearch?... http://spider.seds.org/ngc/revngcic.cgi?NGC492