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]
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Pavo[1] |
| Right ascension | 20h 05m 32.76549s[2] |
| Declination | −67° 19′ 15.2261″[2] |
| Apparent magnitude (V) | 6.07[3] |
| Characteristics | |
| Evolutionary stage | Main sequence |
| Spectral type | G3V[3] |
| Apparent magnitude (U) | 6.79[4] |
| Apparent magnitude (B) | 6.71[3] |
| Apparent magnitude (V) | 6.07[3] |
| Apparent magnitude (J) | 5.108±0.266[5] |
| Apparent magnitude (H) | 4.724±0.076[5] |
| Apparent magnitude (K) | 4.511±0.026[5] |
| Astrometry | |
| Radial velocity (Rv) | −10.548±0.0003[6] km/s |
| Proper motion (μ) | RA: 845.252±0.016 mas/yr[2] Dec.: −674.213±0.024 mas/yr[2] |
| Parallax (π) | 55.7654±0.0245 mas[2] |
| Distance | 58.49 ± 0.03 ly (17.932 ± 0.008 pc) |
| Absolute magnitude (MV) | 4.75[3] |
| Details | |
| Mass | 0.83±0.01[3] M☉ |
| Radius | 1.1[2] R☉ |
| Luminosity | 2.11[3] L☉ |
| Surface gravity (log g) | 4.41±0.01[3] cgs |
| Temperature | 5,726±15[3] K |
| Metallicity [Fe/H] | −0.24±0.01[3] dex |
| Rotation | 38.8 days[3] |
| Rotational velocity (v sin i) | 2.0[7] km/s |
| Age | 11.0±0.5 Gyr[3] 7.23±2.99 Gyr[8] 4.11[9] Gyr |
| Other designations | |
| CD−67 2385, CPD−67 3703, GJ 776, HD 189567, HIP 98959, HR 7644, SAO 254721, PPM 364390, Ci 20 1180, LFT 1512, LHS 484, LPM 720, LTT 7928, NLTT 48618, PLX 4738, PM 20006-6727, TYC 9098-1638-1, GCRV 12398, GSC 09098-01638, IRAS 20006-6727, 2MASS J20053286-6719156[4] | |
| Database references | |
| SIMBAD | data |
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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