HD 189567
Star in the constellation Pavo From Wikipedia, the free encyclopedia
HD 189567 is a star with a pair of orbiting exoplanets, located in the southern constellation of Pavo. It is also known as Gliese 776, CD-67 2385, and HR 7644. The star has an apparent visual magnitude of 6.07,[3] which is bright enough for it to be dimly visible to the naked eye. It lies at a distance of 58 light years from the Sun based on parallax measurements, but is drifting closer with a radial velocity of −10.5 km/s.[6]
The spectrum of HD 189567 presents as an ordinary G-type main-sequence star with a stellar classification of G3V.[3] It has 83%[3] of the mass of the Sun but 110% of the Sun's radius.[2] The star is moderately depleted in heavy elements, having 55% of the solar abundance of iron,[10] but is less depleted in oxygen, having 80% of its solar abundance.[11] It has a low level of magnetic activity in its chromosphere.[3] Age estimates range from 4.11 Gyr based on chromospheric heating to 11.26 Gyr from stellar rotation.[9] The star is radiating 2.1 times the luminosity of the Sun from its photosphere at an effective temperature of 5,726 K.[3]
Planetary system
One exoplanet was discovered around the star in 2011, HD 189567 b.[12] This exoplanet has an estimated minimum mass of 8.5 Earth masses, which means that it is most likely a mini-Neptune.[13] It has an orbital period of 14.3 days, placing it well interior to the habitable zone of the star system.[14] The planet's existence was confirmed in 2021, along with the discovery of a second planet, HD 189567 c.[3]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥8.5±0.6 M🜨 | 0.111±0.002 | 14.288±0.002 | <0.189 | — | — |
| c | ≥7.0±0.9 M🜨 | 0.197±0.003 | 33.688±0.025 | 0.16±0.09 | — | — |
References
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