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physical object > natural object > celestial body > collection of stars > star system > binary star > close binary > nova > recurrent nova
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recurrent nova comparison table
Subject has reference has distance has acronym has image has definition has erupted in
RS Ophiuchi  CV   
T PyxidisShara, M.M., Zurek, D.R., Williams, R.E., Prialnik, D., Roberto.G., Moffat, A.F.J. : 1997, AJ 114, 258. HST Imagery of the Non-Expanding, Clumped Shell of the Recurrent Nova T Pyxidisfrom Earth 6000 light-yearsT Pyxa recurrent nova1966, 1944, 1920, 1902, and 1890.
WZ Sagittae  CV 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. 

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