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Gliese 876

This red dwarf has one of the the smallest planets discovered so far. The planet with 8 times the mass of Earth and twice its diameter orbits the star every 1.94 days in in a distance of 0.021 AU. It is not sure yet if it is a gaseous or a terrestrial planet. But with its temperature of 500 - 700 kelvin it is a bit too hot for life.

Two more planets with 1.6 and 0.5 times the mass of Jupiter orbit the star in 0.21 and 0.13 AU distance.

Constellation: Aquarius
Age: 11 billion years
Distance: 15.2 light-years
Spectral class: M3.5
Visual magnitude: 10.17
Luminosity: 0.0016 * Sun
Mass: 0.32 * Sun
Diameter: 0.36 * Sun

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    Gliese 876
Artist impression of the planet.
Graphic: NSF

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