Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Dorado |
Right ascension | 04h 09m 15.66834s [1] |
Declination | −53° 22′ 25.2900″ [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) | 58.30±0.24 [1] km/s |
Proper motion (μ) |
RA: 1046.236±0.019
mas/
yr
[1] Dec.: 584.166±0.023 mas/ yr [1] |
Parallax (π) | 66.0705 ± 0.0172 mas [1] |
Distance | 49.36 ± 0.01
ly (15.135 ± 0.004 pc) |
Absolute magnitude (MV) | 10.91 [2] |
Details | |
Mass | 0.405±0.010 [4] M☉ |
Radius | 0.409+0.017 −0.016 [4] R☉ |
Luminosity | 0.02163±0.00063 [4] L☉ |
Surface gravity (log g) | 4.87 [5] cgs |
Temperature | 3,460+76 −74 [4] K |
Metallicity [Fe/H] | 0.1±0.1 [6] 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. [6] 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% [6] of the luminosity of the Sun from its photosphere at an effective temperature of 3,460 K. [4]
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 to potentially be in the star's habitable zone, although it is hotter than Earth, with a temperature of 60 deg. C (140 deg. F). It has an eccentricity estimated to be about 0.03, giving it a fairly circular orbit. 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, [6] 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🜨 | 0.060+0.005 −0.006 |
8.6312+0.0023 −0.0021 |
0.02+0.12 −0.02 |
— | — |
c | ≥7.6+2.9 −2.3 M🜨 |
0.124+0.010 −0.013 |
25.637±0.042 | 0.03+0.18 −0.03 |
— | — |
f | ≥6.8±4.4 M🜨 | 0.326+0.027 −0.034 |
109.5+1.6 −1.4 |
0.04+0.23 −0.04 |
— | — |
e | ≥13.6+8.2 −6.5 M🜨 |
0.700±0.066 | 349+12 −10 |
0.03+0.25 −0.03 |
— | — |
d | ≥20.2±7.6 M🜨 | 1.021+0.088 −0.118 |
604+29 −24 |
0.02+0.22 −0.02 |
— | — |
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