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 Apparent magnitude () is a measure of the brightness of a star or other astronomical object observed from Earth. An object's apparent magnitude depends on its intrinsic luminosity, its distance from Earth, and any extinction of the object's lig ...

of 8.01. The system is located at a distance of 232 light years from the

Sun The Sun is the star at the center of the Solar System. It is a nearly perfect ball of hot plasma, heated to incandescence by nuclear fusion reactions in its core. The Sun radiates this energy mainly as light, ultraviolet, and infrared radi ...

based on parallax measurements, and it is drifting further away with a radial velocity of 5 km/s. It shows a high proper motion, traversing the celestial sphere at an angular rate of . This yellow-hued star has a stellar classification of G5IV/V, which, together with the star's

absolute magnitude Absolute magnitude () is a measure of the luminosity of a celestial object on an inverse logarithmic astronomical magnitude scale. An object's absolute magnitude is defined to be equal to the apparent magnitude that the object would have if it ...

of 3.88, is consistent with a star that is in the early stages of

evolving Evolution is change in the heritable characteristics of biological populations over successive generations. These characteristics are the expressions of genes, which are passed on from parent to offspring during reproduction. Variation t ...

off the main sequence. It has a high metallicity and is spinning with a

projected rotational velocity Stellar rotation is the angular motion of a star about its axis. The rate of rotation can be measured from the spectrum of the star, or by timing the movements of active features on the surface. The rotation of a star produces an equatorial bulg ...

of 2.6 km/s. The star has 1.2 times the mass of the Sun and 1.75 times the Sun's girth. It is radiating 2.9 times the

Sun's luminosity The solar luminosity (), is a unit of radiant flux (power emitted in the form of photons) conventionally used by astronomers to measure the luminosity of stars, galaxies and other celestial objects in terms of the output of the Sun. One nominal ...

from its photosphere at an effective temperature of 5,635 K.

Planetary system

A Jovian planetary companion was discovered in 2010 by a team of the

Magellan Planet Search Program The Magellan Planet Search Program is a ground-based search for extrasolar planets that makes use of the radial velocity method. It began gathering data in December 2002 using thMIKEechelle spectrograph mounted on the 6.5m Magellan II "Clay" tele ...

, 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 The orbital period (also revolution period) is the amount of time a given astronomical object takes to complete one orbit around another object. In astronomy, it usually applies to planets or asteroids orbiting the Sun, moons orbiting planets ...

of at a distance of from the host star with an

eccentricity Eccentricity or eccentric may refer to: * Eccentricity (behavior), odd behavior on the part of a person, as opposed to being "normal" Mathematics, science and technology Mathematics * Off-Centre (geometry), center, in geometry * Eccentricity (g ...

(ovalness) of 0.54. Since the inclination of the

orbital plane The orbital plane of a revolving body is the geometric plane in which its orbit lies. Three non-collinear points in space suffice to determine an orbital plane. A common example would be the positions of the centers of a massive body (host) an ...

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. 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. An

astrometric Astrometry is a branch of astronomy that involves precise measurements of the positions and movements of stars and other celestial bodies. It provides the kinematics and physical origin of the Solar System and this galaxy, the Milky Way. His ...

measurement of the planet's inclination and true mass was published in 2022 as part of

Gaia DR3 The ''Gaia'' catalogues are star catalogues created using the results obtained by '' Gaia'' space telescope. The catalogues are released in stages that will contain increasing amounts of information; the early releases also miss some stars, espec ...

, while another 2022 study found a different, lower true mass.

References

{{DEFAULTSORT:HD 175167 G-type main-sequence stars G-type subgiants Planetary systems with one confirmed planet Pavo (constellation) CD-70 01658 175167 093281

Planetary system

See also

References