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Radial velocity · 2014

bet UMi b

This world receives 274× the starlight Earth does; a year lasts 522 days; the light you see left it 126 years ago.

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Size
1.1 × Jupiterestimated
A year
522 days1.4 AU
Temperature
767 °C1,041 K

About this world

bet UMi b is a gas giant orbiting bet UMi, a giant star (type K4III) 126 light-years from Earth. It is about 1.1 times the size of Jupiter (its size estimated from its mass), with at least 6.1 Jupiter masses (a minimum, measured by radial velocity). It completes an orbit every 522 days at 1.4 AU from its star.

Its equilibrium temperature is about 1,041 K (767 °C): far too hot for liquid water on its surface. At its size it almost certainly keeps a deep envelope of hydrogen and helium.

It was discovered in 2014 by radial velocity with Bohyunsan Optical Astronomical Observatory. The star wobbles toward and away from us, Doppler-shifting its spectrum.

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