How long are the orbital periods of binary stars? Detailed answer

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How long are the orbital periods of binary stars? Detailed answer

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How long are the orbital periods of binary stars?

The largest orbital periods have physical binary stars, the components of which are located far from each other - thousands and tens of thousands of astronomical units (that is, thousands and tens of thousands of times further than the Earth is from the Sun). These are the so-called wide pairs.

Their periods of circulation should reach hundreds of thousands and even millions of years. So, for example, the star Proxima Centauri moves in space together with the bright binary star Alpha Centauri, making a revolution around it in several million years. In the sky, they are separated by an angular distance of 2 degrees, which corresponds to a linear distance of at least 10 thousand astronomical units.

The shortest orbital period, only 81 minutes 38 seconds, has an eclipsing binary star WZ Sge in the constellation Arrows. (So far, this is the minimum of the known orbital periods in the Universe. Even the periods of revolution of artificial satellites of the Earth are longer.)

Author: Kondrashov A.P.

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