HD 175167 is a star with an exoplanet companion in the southern constellation of Pavo. It is too faint to be visible with the naked eye at an apparent visual magnitude of 8.01.[2] The system is located at a distance of 232 light-years from the Sun based on parallax measurements, and it is drifting further away with a radial velocity of 5 km/s.[1] It shows a high proper motion, traversing the celestial sphere at an angular rate of 0.190 arcsec yr−1.[9]
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Pavo |
| Right ascension | 19h 00m 00.83509s[1] |
| Declination | −69° 56′ 39.2647″[1] |
| Apparent magnitude (V) | 8.01[2] |
| Characteristics | |
| Spectral type | G5IV/V[3] |
| Apparent magnitude (B) | 8.761[2] |
| Apparent magnitude (J) | 6.713±0.019[2] |
| Apparent magnitude (H) | 6.381±0.018[2] |
| Apparent magnitude (K) | 6.288±0.018[2] |
| B−V color index | 0.751±0.002[2] |
| Astrometry | |
| Radial velocity (Rv) | 4.58±0.12[1] km/s |
| Proper motion (μ) | RA: -7.234 mas/yr[1] Dec.: -191.895 mas/yr[1] |
| Parallax (π) | 14.0421 ± 0.0229 mas[1] |
| Distance | 232.3 ± 0.4 ly (71.2 ± 0.1 pc) |
| Absolute magnitude (MV) | 3.88[2] |
| Details | |
| Mass | 1.17±0.09[4] M☉ |
| Radius | 1.75±0.04[5] R☉ |
| Luminosity | 2.857[6] L☉ |
| Surface gravity (log g) | 4.09±0.09[4] cgs |
| Temperature | 5,635±28[4] K |
| Metallicity [Fe/H] | +0.28±0.02[4] dex |
| Rotational velocity (v sin i) | 2.6[7] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
This yellow-hued star has a stellar classification of G5IV/V,[3] which, together with the star's absolute magnitude of 3.88,[2] is consistent with a star that is in the early stages of evolving off the main sequence.[10] It has a high metallicity and is spinning with a projected rotational velocity of 2.6 km/s.[7] The star has 1.2[4] times the mass of the Sun and 1.75[5] times the Sun's girth. It is radiating 2.9[6] times the Sun's luminosity from its photosphere at an effective temperature of 5,635 K.[4]
Planetary system
A Jovian planetary companion was discovered in 2010 by a team of the Magellan Planet Search Program, led by Pamela Arriagada. Designated HD 175167 b, their Doppler velocity data (taken over a five year period) indicates the planet has an orbital period of 3.5 years at a distance of 2.40 AU (359 Gm) from the host star with an eccentricity (ovalness) of 0.54.[10] Since the inclination of the orbital plane was initially unknown, it was only possible to deduce a lower bound on the planet's mass. It is at least 7.8 times as massive as Jupiter.[10] In a 2013 paper, Robert A. Wittenmyer and colleagues reviewed the data of this and many other systems with one or two planets for possible additional planets, but were unable to find any evidence of any.[11]
An astrometric measurement of the planet's inclination and true mass was published in 2022 as part of Gaia DR3.[12] A number of subsequent studies in 2022 and 2023 have determined astrometric orbits for HD 175167 b,[13] estimating masses ranging from 6.4 MJ[14] to 15 MJ,[15][16] the latter of which would put it at the borderline of being a brown dwarf. The most recent and accurate mass measurement is 10 MJ, making it a massive super-Jovian planet.[17]
| Companion (in order from star) | Mass | Semimajor axis (AU) | Orbital period (days) | Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 10.2±0.4 MJ | 2.44±0.07[13] | 1275.8±0.4 | 0.529±0.002 | 38.6±1.7° | — |