HD 133131 is a binary star in the constellation of Libra. It is roughly 168 light-years (51.5 parsecs) away from the Sun.[2] It consists of two G-type main-sequence stars;[2] neither are bright enough to be seen with the naked eye.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Libra |
| Right ascension | 15h 03m 35.80651s[1] |
| Declination | −27° 50′ 27.5520″[1] |
| Apparent magnitude (V) | 8.40 + 8.42[2] |
| Characteristics | |
| Spectral type | G2 + G2[2] |
| B−V color index | 0.622[3] |
| Astrometry | |
| Radial velocity (Rv) | -16.30 km/s |
| Proper motion (μ) | RA: 156.88 mas/yr Dec.: -136.07 mas/yr |
| Parallax (π) | 19.4 ± 0.12 mas[4][5][6] |
| Distance | 168 ± 1 ly (51.5 ± 0.3 pc) |
| Orbit[2] | |
| Period (P) | ~4240 yr |
| Details[2] | |
| HD 133131 A | |
| Mass | 0.95 M☉ |
| Surface gravity (log g) | 4.39 ± 0.050 cgs |
| Temperature | 5799 ± 19 K |
| Metallicity [Fe/H] | −0.306 ± 0.016 dex |
| Age | 6.3[3] Gyr |
| HD 133131 B | |
| Mass | 0.93 M☉ |
| Surface gravity (log g) | 4.41 ± 0.045 cgs |
| Temperature | 5805 ± 15 K |
| Metallicity [Fe/H] | −0.281 ± 0.013 dex |
| Age | 5.9[3] Gyr |
| Other designations | |
| HD 133131 A: CD−27 10194A, Gaia DR2 6224633983987510528, SAO 183128, TYC 6756-1541-1, 2MASS J15033543-2750330[5] | |
| HD 133131 B: CD−27 10194B, Gaia DR2 6224633983987511552, SAO 183129, TYC 6756-867-1, 2MASS J15033579-2750273[6] | |
| Database references | |
| SIMBAD | HD 133131 |
| HD 133131 A | |
| HD 133131 B | |
Both components, HD 133131 A and B, are very similar to the Sun but are far older, about 6 billion years old. They also have low metallicities (50% of solar abundance), and HD 133131 A is additionally depleted in heavy elements compared to HD 133131 B, indicating a possibly past planetary engulfment event for HD 133131 B.[7]
Planetary system
editIn 2016 two planets orbiting HD 133131 A and one planet orbiting HD 133131 B were discovered utilizing the radial velocity method.[2]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥1.43 MJ | 1.44 | 649 | 0.32 | — | — |
| c | ≥0.63 MJ | 4.79 | 3925 | 0.20 | — | — |
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥2.50 MJ | 6.40 | 6119 | 0.62 | — | — |
References
edit- ^ a b van Leeuwen, F.; et al. (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.
- ^ a b c d e f g h i Teske, Johanna K; Shectman, Stephen A; Vogt, Steve S; Díaz, Matías; Butler, R. Paul; Crane, Jeffrey D; Thompson, Ian B; Arriagada, Pamela (2016). "The Magellan PFS Planet Search Program: Radial Velocity and Stellar Abundance Analyses of the 360 AU, Metal-Poor Binary "Twins" HD 133131A & B". The Astronomical Journal. 152 (6): 167. arXiv:1608.06216. Bibcode:2016AJ....152..167T. doi:10.3847/0004-6256/152/6/167. S2CID 118852162.
- ^ a b c Arriagada, Pamela (2011), "Chromospheric Activity of Southern Stars from the Magellan Planet Search Program", The Astrophysical Journal, 734 (1): 70, arXiv:1104.3186, Bibcode:2011ApJ...734...70A, doi:10.1088/0004-637X/734/1/70, S2CID 118384591
- ^ a b "HD 133131". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 29 September 2020.
- ^ a b "HD 133131 A". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 29 September 2020.
- ^ a b "HD 133131 B". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 29 September 2020.
- ^ Oh, Semyeong; Price-Whelan, Adrian M.; Brewer, John M.; Hogg, David W.; Spergel, David N.; Myles, Justin (2017), "Kronos and Krios: Evidence for Accretion of a Massive, Rocky Planetary System in a Comoving Pair of Solar-type Stars", The Astrophysical Journal, 854 (2): 138, arXiv:1709.05344, doi:10.3847/1538-4357/aaab4d, S2CID 119076217
 | This binary or multiple star system–related article is a stub. You can help Wikipedia by expanding it. |
 | This main-sequence-star-related article is a stub. You can help Wikipedia by expanding it. |