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Sakurai's Object

The white dwarf flashed up brightly in the year 1996 and slowly faded away thereafter. Whereas it is still much brighter than before. So it wasn't a nova.
Instead in the long dead object hydrogen was slowly wandering inside, ignited and raised the star back to life. About 200 years this will last until the star fades forever.

The data for distance and luminosity are extremely uncertain.

Constellation: Sagittarius
Distance: circa 3200 light-years
Spectral class: S
Visual magnitude: 21.5 - 10.9
Luminosity: circa 2000 * Sun
Mass: 0.9 * Sun

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