  | |
| Observation data EpochJ2000.0 EquinoxJ2000.0 | |
|---|---|
| Constellation | Virgo |
| Right ascension | 12h 39m 14.76696s[1] |
| Declination | −07° 59′ 44.0338″[1] |
| Apparent magnitude (V) | 4.652[2] |
| Characteristics | |
| Spectral type | K2 III[3] |
| U−Bcolor index | +1.389[2] |
| B−Vcolor index | +1.239[2] |
| Astrometry | |
| Radial velocity (Rv) | −18.11±0.07[4] km/s |
| Proper motion (μ) | RA: −77.223[1]mas/yr Dec.: −24.409[1]mas/yr |
| Parallax (π) | 10.3526±0.1151 mas[1] |
| Distance | 315 ± 4 ly (97 ± 1 pc) |
| Absolute magnitude (MV) | −0.29±0.19[5] |
| Details[4] | |
| Mass | 2.28±0.35 M☉ |
| Radius | 20.15±2 R☉ |
| Luminosity | 107 L☉ |
| Surface gravity (log g) | 2.15±0.1 cgs |
| Temperature | 4,559±53 K |
| Metallicity | 0.05±0.1 |
| Rotational velocity (v sin i) | 2.52±0.45 km/s |
| Age | 0.86±0.34[5] Gyr |
| Other designations | |
| 26 Virginis,BD−07°3452,GC 17227,GCRV 7604,HD 110014,HIP 61740,HR 4813,PPM 195694,SAO 138892.[6] | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
Chi Virginis (χ Vir, χ Virginis) is adouble star in theconstellationVirgo. Based uponparallax measurements, it is approximately 315light-years (97parsecs) fromEarth. It has an apparent visual magnitude of 4.65, which is bright enough to be seen with the unaided eye undersuitable viewing conditions.
This star has astellar classification of K2 III,[3] with theluminosity class "III" indicating that this is agiant star that has consumed the hydrogen at its core and evolved away from themain sequence. It has a mass about double that of the Sun and has expanded to 20 times theSun's radius, giving it a luminosity of 107 times theluminosity of the Sun. Theeffective temperature of the star's outer envelope is about 4,559 K,[4] which gives the star the orange hue typical of K-type stars.[7] The abundance of elements other than hydrogen and helium, what astronomers term the star'smetallicity, is slightly higher than in the Sun.[8][4]
This star has three optical companions. At an angular separation of 173.1arcseconds is a magnitude +9.1 star, which is ofspectral type K0. A 10th magnitude star is located 221.2 arcseconds away, and the third is a magnitude +9.1 K2 star 321.2 arcseconds away. None of these have been confirmed as a physical companion.[9]
In July 2009, it was discovered that Chi Virginis has a massive planet with a highorbital eccentricity of 0.46. It is orbiting with a period of about 835 days and has a mass at least 11 times greater thanJupiter. There are indications of a second planet orbiting with a period of 130 days, but this has not been firmly established.[10]
In May 2015, the existence of a second planet candidate,HD 110014 c [es], (Chi Virginis c, about three times the mass of Jupiter and having an orbit roughly that of Venus) was announced by Chilean astronomerMaritza Soto. The two-planet model could not be confirmed, and theradial velocity variations attributed to the second planet might instead be caused by astarspot.[11] A 2021 review of planets around giant stars lists this second planet as "questionable".[12]
| Companion (in order from star) | Mass | Semimajor axis (AU) | Orbital period (days) | Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| c(unconfirmed) | ≥3.1±0.4MJ | 0.64±0.003 | 130.0±0.9 | 0.44±0.2 | — | — |
| b | ≥10.7±1.0 MJ | 2.31±0.04 | 882.6±21.5 | 0.26±0.1 | — | — |
