HIP 5158
| 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 | |
| Radial velocity (Rv) | 15.28 km/s |
| Proper motion (μ) | RA: 203.899±0.087[2] mas/yr Dec.: -106.761±0.065[2] mas/yr |
| Parallax (π) | 19.3500 ± 0.0388 mas[2] |
| Distance | 168.6 ± 0.3 ly (51.7 ± 0.1 pc) |
| Absolute magnitude (MV) | 6.95 |
| Details | |
| Mass | 0.780 ± 0.021[3] M☉ |
| Radius | 0.71 ± 0.12 R☉ |
| Luminosity | 0.11[3] L☉ |
| Surface gravity (log g) | 4.37 ± 0.20[3] cgs |
| Temperature | 4962 ± 89[3] K |
| Metallicity | [Fe/H] = 0.10 ± 0.07[3] |
| Age | 4.9 ± 3.7[4] Gyr |
| Rotation | 1.57☉ (42.3 days)[3] |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
HIP 5158 is a 10th magnitude K-type main sequence star located approximately 130 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, having concentration of heavy elements equal to 125% of solar abundance.
Planetary system
In 2009, a gas giant planet was found in orbit around the star. The quadratic drift in the radial velocities did indicate the presence of an additional outer planet in the system,[3] which was confirmed in 2011 as brown dwarf HIP 5158 c.[5]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥1.42 MJ | 0.89 | 345.72 ± 5.37 | 0.52 ± 0.08 | — | — |
| c | ≥15.04 MJ | 7.7±1.88 | 9018±3181 | 0.14±0.1 | — | — |
See also
References
- ^ a b van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600. Vizier catalog entry
- ^ a b c CD-23 395 -- High proper-motion Star
- ^ a b c d e f g h Lo Curto, G.; et al. (2015). "The HARPS search for southern extra-solar planets. XXII. Multiple planet systems from the HARPS volume limited sample". Astronomy and Astrophysics. 512. A48. arXiv:1411.7048. Bibcode:2010A&A...512A..48L. doi:10.1051/0004-6361/200913523.
- ^ Bonfanti, A.; et al. (2015). "Revising the ages of planet-hosting stars". Astronomy and Astrophysics. 575. A18. arXiv:1411.4302. Bibcode:2015A&A...575A..18B. doi:10.1051/0004-6361/201424951. S2CID 54555839.
- ^ a b Feroz, F.; Balan, S. T.; Hobson, M. P. (2011), "Bayesian evidence for two companions orbiting HIP 5158", Monthly Notices of the Royal Astronomical Society: Letters, 416: L104–L108, arXiv:1105.1150, doi:10.1111/j.1745-3933.2011.01109.x, S2CID 118517956
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