HD 34445 is a planetary system made of at least one star and five, maybe six planets. Its age is estimated to be about 8.5 billion years.
The star a yellow dwarf of spectral type G0V. Its mass, its radius and its luminosity are respectively 1.07, 1.34 et 2.01 times those of the Sun. Its effective temperature is 5836 kelvins (5563 °C), similar to that of the Sun (5772 K, 5499 °C). Its métallicity (content of elements heavier than hydrogen and heliun) is 38% larger than that of the Sun.
The discovery of HD 34445 b, the first planet known in the system, was announced by Howard et al. in 2010, even if it was already suspected in 2004. This planet, a bit less massive than Jupiter, is at the same distance from its star as the asteroid main belt from the Sun.
Five additional potential planets were recently announced (Vogt et al. 2017), all closer to the star than HD 34445 b except one. The innermost planet, HD 34445 e, is on an orbit inner than Mercure’s. HD 34445 d is a super-Neptune located at half the Sun-Earth distance and HD 34445 c is a sub-Saturn on a Venus-like orbit. HD 34445 f is on its side a super-Neptune on a Mars-like orbit. Finally, the outermost planet, HD 34445 g, is slightly more massive than Saturne and on an orbit a little larger than Jupiter’s.HD
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