IC 5117 vs NGC 6879
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IC 5117
IC 5117 is a compact planetary nebula in the constellation Cygnus. Its small apparent size can make it resemble a star when viewed through a modest telescope, although its emission is produced by ionized gas surrounding a hot stellar remnant. Spectroscopic observations distinguish it from an ordinary star by revealing the characteristic emission lines of a planetary nebula.
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NGC 6879
NGC 6879 is a planetary nebula in the constellation Sagitta, catalogued as a compact, nearly stellar object about 5 arcseconds across and roughly magnitude 12.5 in visual observing lists. Like other planetary nebulae, it is a shell of gas expelled by an evolved low- or intermediate-mass star and lit by the hot remnant at its center; the name does not indicate a planet. It is chiefly a target for t...
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