| Observation data Epoch J2000.0 Equinox J2000.0 |
|
|---|---|
| Constellation | Cetus |
| Right ascension | 01h 06m 02.05s [1] |
| Declination | –22° 27′ 11.3″ [1] |
| Apparent magnitude (V) | 10.21 |
| Characteristics | |
| Spectral type | K5V |
| Apparent magnitude (B) | 11.29 |
| B−V color index | 1.08 |
| Astrometry | |
| Proper motion (μ) | RA: 202.62 ± 2.37 [1] mas/yr Dec.: –106.84 ± 1.27 [1] mas/yr |
| Parallax (π) | 24.28 ± 2.14[1] mas |
| Distance | 130 ± 10 ly (41 ± 4 pc) |
| Absolute magnitude (MV) | 6.95 |
| Details | |
| Mass | 0.780 ± 0.021[2] M☉ |
| Radius | 0.71 ± 0.12 R☉ |
| Surface gravity (log g) | 4.37 ± 0.20[2] |
| Luminosity | 0.11[2] L☉ |
| Temperature | 4962 ± 89[2] K |
| Metallicity | [Fe/H] = 0.10 ± 0.07[2] |
| Rotation | 42.3 days[2] |
| Age | <6[2] years |
| Rotation | 1.57[2] |
| Other designations | |
| Database references | |
| SIMBAD | data |
| NStED | data |
| Extrasolar Planets Encyclopaedia |
data |
HIP 5158 is a 10th magnitude K-type main sequence star located approximately 135 light years away in the constellation Cetus. This star is smaller, cooler, fainter, and less massive than our Sun, but it is more metal rich. In 2009, a gas giant planet was found in orbit around the star. There is a quadratic drift in the radial velocities that may indicate the presence of an additional outer planet in the system.[2]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity |
|---|---|---|---|---|
| b | ≥1.42 MJ | 0.89 | 345.72 ± 5.37 | 0.52 ± 0.08 |
| c | ≥15.04 MJ | 7.7 | 9018 ± 3181 | 0.14 ± 0.1 |