NGC 5189
james dunlop
['henri lebesgue', 'toshimasa furuta', 'urbain le verrier', 'tycho', 'nanking', 'hyperboloid', 'edward bowell', 'seymour papert', 'maurice martenot', 'mike brown', 'august derleth', 'august kopff', 'herschel', 'lewis swift', 'moog', 'nikola tesla', 'chad trujillo', 'max wolf', 'sir nigel gresley', 'bernhard schmidt', 'sir alexander fleming', 'edwin mcmillan', 'humphry davy', 'odin', 'michael brown', 'otto hahn', 'microsoft', 'lionel penrose', 'cavendish', 'bickley', 'julian huxley', 'nikolai stepanovich chernykh', 'lee de forest', 'kant', 'benjamin franklin', 'carl auer von welsbach', 'cyril jackson', 'auguste charlois', 'carl gustav mosander', 'henry bessemer', 'robert bunsen', 'hyperloop', 'carolyn shoemaker', 'edwin hubble', 'annibale de gasparis', 'nikolai chernykh', 'alonzo church', 'nicolas bourriaud', 'edward said', 'james watt', 'rudolf diesel', 'gridshell', 'christopher latham sholes', 'speke', 'george van biesbroeck', 'cornelis johannes van houten', 'carl wilhelm scheele', 'fabian gottlieb von bellingshausen', 'harlow shapley', 'robert luther', 'pieter zeeman', 'liisi oterma', 'loneos', 'ingrid', 'emmett chapman', 'sir arthur evans', 'george maciunas', 'sequoyah', 'gotthold ephraim lessing', 'william hyde wollaston', 'roger penrose', 'kirchhoff', 'heinrich ruhmkorff', 'frederick scott archer', 'william rowan hamilton', 'ernest hemingway', 'johan gadolin', 'turing', 'karl drais', 'arnold schoenberg', 'stallman', 'ole kirk christiansen', 'paolo maffei', 'henri cartan', 'oak ridge observatory', 'linear', 'crimean astrophysical observatory', 'werner heisenberg', 'conway', 'georg cantor', 'charles darwin', 'george berkeley', 'thomas newcomen', 'urata', 'lord rayleigh', 'gustav rose', 'christopher alexander', 'donald knuth', 'ephraim shay']
NGC 5189
NGC 5189 (Gum 47, IC 4274, nicknamed Spiral Planetary Nebula) is a planetary nebula in the constellation Musca. It was discovered by James Dunlop on 1 July 1826, who catalogued it as Δ252. For many years, well into the 1960s, it was thought to be a bright emission nebula. It was Karl Gordon Henize in 1967 who first described NGC 5189 as quasi-planetary based on its spectral emissions. Seen through the telescope it seems to have an S shape, reminiscent of a barred spiral galaxy. The S shape, together with point-symmetric knots in the nebula, have for a long time hinted to astronomers that a binary central star is present. Observations with the Southern African Large Telescope have finally found a white dwarf companion in a 4.04 day orbit around the rare low-mass Wolf-Rayet type central star of NGC 5189. NGC 5189 is estimated to be 546 parsec. or 1,780 light years away from Earth. Other measurements have yielded results up to 900 parsecs (~3000 light-years)