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physical object > natural object > celestial body > collection of stars > star system > binary star > close binary > nova > recurrent nova > WZ Sagittae
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WZ Sagittae comparison table
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recurrent nova nova 
WZ Sagittaerecurrent nova A recurrent DAe old nova (1913 and 1946) with the shortest known orbital period (about 80 minutes). It is almost certainly a close binary system in which mass is being transferred onto a white-dwarf primary.

Next recurrent novaRS Ophiuchi    Uprecurrent nova    Previous recurrent novaT Pyxidis