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RX J0806

The pair of white dwarfs is the narrowest known double star and one of the strongest sources for gravitational waves in our Milky Way. Each year the orbit period decreases for 1.2 milliseconds and the distance gets half a meter less. So the stars will crash together in several hundred thousand years.

Constellation: Cancer
Distance: 1600 light-years
Mass A and B: each 0.5 * Sun
Space between RX J0806 A and B: 0.0005 AU
Orbit period of RX J0806 A and B: 321 seconds

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    RX J0806
Graphic: GSFC/D. Berry

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