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83 Leonis

In this double system of a orange-red subgiant (A) and a orange-red main sequence star (B) in January 2005 a planet was discovered aroung the B star.

The planet with only 0.122 times the mass of Jupiter (36 * Earth mass) orbits its star in a nearly round circle in only 0.119 AU distance and is therefore very hot. Star A is on its way to become a fully grown red giant which is not yet dangerous for the planet of star B.

Constellation: Leo
Age: 6-8 billion years
Distance: 57.6 light-years
Radial velocity: 3.8 km/sec
Space between 83 Leonis A and B: 502 AU
Orbit period of 83 Leonis A and B: 32 000 years

83 Leonis A

Spectral class: K0
Visual magnitude: 6.49
Luminosity: 0.69 * Sun
Mass: <1 * Sun
Diameter: 1.91 * Sun
 

83 Leonis B

Spectral class: K2
Visual magnitude: 7.58
Luminosity: 0.25 * Sun
Mass: 0.88 * Sun
Diameter: 0.81 * Sun

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    83 Leonis
Photo: ESO Online Digitized Sky Survey

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