Hellenica World

HD 215497

HD 215497 is a star located approximately 142 light-years away in the constellation of Tucana. It is a K3V star with the characteristics very similar to the Sun. In 2009, two extrasolar planets were discovered orbiting the star.[1]

Planetary system

Announced in 2009, two extrasolar planets were discovered to be orbiting the star. Both planets are less massive than Jupiter. The inner planet HD 215497 b orbits very close to the star and is termed a “hot super-Earth”. The outer planet HD 215497 c is Saturn-sized and orbits a little bit further from the star as the Earth, at around 1.282 AU.[1]

The HD 215497 system[1]
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
(days)
Eccentricity
b >0.02 MJ 0.047 3.93404 ± 0.00066 0.16 ± 0.09
c >0.33 MJ 1.282 567.94 ± 2.70 0.49 ± 0.04

References

1. ^ a b c d e f g h i j Lo Curto, G. et al. (2010). "The HARPS search for southern extra-solar planets. XXII. Multiple planet systems from the HARPS volume limited sample". Astronomy and Astrophysics 512. doi:10.1051/0004-6361/200913523. Bibcode: 2010A&A...512A..48L.

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