HD 189567

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]

HD 189567

Location of HD 189567 (circled)
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]

The HD 189567 planetary system^[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	—	—