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HD 155358

This very old, yellow star is at the end of its main sequence stadium. It is orbited by two planets with 0.89 and 0.50 times the mass of Jupiter in a distance of 0.63 and 1.22 AU. The orbits take 195 and 530 days. The star only has one fifth of the heavy elements compared to the Sun. It is the most metal depleted star with planets known to us. These planets probably don't even have a solid core, but consist almost exclusively of hydrogen and helium.

Constellation: Hercules
Age: 10 billion years
Distance: 141,5 light-years
Spectral class: G0
Visual magnitude: 7.5
Mass: 0.87 * Sun

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05/25/2007

    HD 155358
Photo: ESO Online Digitized Sky Survey

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