Gliese 163
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Dorado |
Right ascension | 04h 09m 15.668s[1] |
Declination | −53° 22′ 25.29″[1] |
Apparent magnitude (V) | 11.79[2] |
Characteristics | |
Spectral type | M3.5V[3] |
B−V color index | 1.480±0.008[2] |
Astrometry | |
Radial velocity (Rv) | +36.9±10.0[2] km/s |
Proper motion (μ) | RA: +1046.141[1] mas/yr Dec.: +584.130[1] mas/yr |
Parallax (π) | 66.0714 ± 0.0314[1] mas |
Distance | 49.36 ± 0.02 ly (15.135 ± 0.007 pc) |
Absolute magnitude (MV) | 10.91[2] |
Details | |
Mass | 0.405±0.010[4] M☉ |
Radius | 0.409+0.017 −0.016 R☉[4] R☉ |
Luminosity | 0.0196±0.001[5] L☉ |
Surface gravity (log g) | 4.87[6] cgs |
Temperature | 3,460+76 −74[4] K |
Metallicity [Fe/H] | 0.1±0.1[5] dex |
Rotation | 61.0±0.3 d[7] |
Rotational velocity (v sin i) | 0.85[8] km/s |
Age | 5[9] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
Gliese 163 is a faint red dwarf star with multiple exoplanetary companions in the southern constellation of Dorado. Other stellar catalog names for it include HIP 19394 and LHS 188.[10] It is too faint to be visible to the naked eye, having an apparent visual magnitude of 11.79[2] and an absolute magnitude of 10.91.[2] This system is located at a distance of 49.4 light-years from the Sun based on parallax measurements.[1] Judging by its space velocity components, it is most likely a thick disk star.[3]
This is a small M-type main-sequence star with a stellar classification of M3.5V.[3] It has a relatively low activity level for a red dwarf of its mass, suggesting it is an old star with an age of at least two billion years.[5] This star has 41% of the mass and radius of the Sun.[4] It is spinning slowly with a projected rotational velocity of 0.85 km/s[8] and has a rotation period of 61 days.[7] The star is radiating just 2%[5] of the luminosity of the Sun from its photosphere at an effective temperature of 3,460 K.[4]
Planetary system[]
In September 2012, astronomers using the HARPS instrument announced the discovery of two planets orbiting Gliese 163.[11][12] The first planet, Gliese 163 b, is a super-Earth or mini-Neptune with an orbital period of 9 days, therefore far too hot to be considered habitable. However, Gliese 163 c, with an orbital period of 26 days and a minimum mass of 6.9 Earth masses, was considered potentially in the habitable zone, although hotter than Earth, with a temperature of 60 deg. C (140 deg. F) It has an ecc. of 0.03 or 3 per.. Evidence was also found for a third planet orbiting further out than c and b.[11][12]
In June 2013, it was concluded that at least 3 planets orbit around the star with a fourth planet being a possibility,[5] and in a paper submitted to arXiv in June 2019, that and another planet were found, thus giving the system a total of five planets.[13]
Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b | ≥9.9±2.3 M |