Astronomy:HD 133131
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Short description: Binary star in the constellation Libra
| Observation data {{#ifeq:J2000|J2000.0 (ICRS)|Epoch J2000.0 Equinox J2000.0 (ICRS)| [[History:Epoch|Epoch J2000]] [[Astronomy:Equinox (celestial coordinates)|Equinox J2000}} | |
|---|---|
| Constellation | Libra[1] |
| A | |
| Right ascension | 15h 03m 35.44599s[2] |
| Declination | −27° 50′ 33.2195″[2] |
| Apparent magnitude (V) | 8.40[3] |
| B | |
| Right ascension | 15h 03m 35.80805s[4] |
| Declination | −27° 50′ 27.5843″[4] |
| Apparent magnitude (V) | 8.42[3] |
| Characteristics | |
| A | |
| Evolutionary stage | main sequence[2] |
| Spectral type | G2V[3] |
| B−V color index | +0.622[5] |
| B | |
| Evolutionary stage | main sequence[4] |
| Spectral type | G2V[3] |
| B−V color index | +0.622[5] |
| Astrometry | |
| A | |
| Radial velocity (Rv) | −16.37±0.19[2] km/s |
| Proper motion (μ) | RA: +156.227[2] mas/yr Dec.: −133.767[2] mas/yr |
| Parallax (π) | 19.4325 ± 0.0265[2] mas |
| Distance | 167.8 ± 0.2 ly (51.46 ± 0.07 pc) |
| B | |
| Radial velocity (Rv) | −15.70±0.18[4] km/s |
| Proper motion (μ) | RA: +159.010 mas/yr Dec.: −139.133 mas/yr |
| Parallax (π) | 19.4131 ± 0.0293[4] mas |
| Distance | 168.0 ± 0.3 ly (51.51 ± 0.08 pc) |
| Orbit[3] | |
| Period (P) | ~4240 yr |
| Details | |
| HD 133131A | |
| Mass | 0.95[3] M☉ |
| Radius | 1.00[2] R☉ |
| Luminosity | 9.6[2] L☉ |
| Surface gravity (log g) | 4.39±0.050[3] cgs |
| Temperature | 5,799±19[3] K |
| Metallicity [Fe/H] | −0.306±0.016[3] dex |
| Rotation | 23 days[6] |
| Rotational velocity (v sin i) | 4.0[7] km/s |
| Age | 6.3[5] Gyr |
| HD 133131B | |
| Mass | 0.93[3] M☉ |
| Radius | 1.01[4] R☉ |
| Luminosity | 0.98[4] L☉ |
| Surface gravity (log g) | 4.41±0.045[3] cgs |
| Temperature | 5,805±15[3] K |
| Rotation | 22 days[6] |
| Rotational velocity (v sin i) | 7.0[7] km/s |
| Age | 5.9[5] Gyr |
| Other designations | |
| HD 133131A: SAO 183128, TYC 6756-1541-1, 2MASS J15033543-2750330[9] | |
| HD 133131B: SAO 183129, TYC 6756-867-1, 2MASS J15033579-2750273[10] | |
| Database references | |
| SIMBAD | The system |
| A | |
| B | |
| Exoplanet Archive | data |
HD 133131 is a binary star in the constellation of Libra. It is 168 light-years (51.5 parsecs) away from the Sun.[3] It consists of two G-type main-sequence stars;[3] neither are bright enough to be seen with the naked eye. The star was first catalogued as a binary in 1972.[11][3]
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 133131A is additionally depleted in heavy elements compared to HD 133131B, indicating a possibly past planetary engulfment event for HD 133131 B.[6]
Planetary system
In 2016, two planets orbiting HD 133131A and one planet orbiting HD 133131B were discovered utilizing the radial velocity method. All three are long-period giant planets.[3]
| 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 | — | — |
See also
Other systems with multiple planet-hosting stars:
References
- ↑ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific 99 (617): 695. doi:10.1086/132034. Bibcode: 1987PASP...99..695R Constellation record for this object at VizieR.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ 3.00 3.01 3.02 3.03 3.04 3.05 3.06 3.07 3.08 3.09 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 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. doi:10.3847/0004-6256/152/6/167. Bibcode: 2016AJ....152..167T.
- ↑ 4.0 4.1 4.2 4.3 4.4 4.5 4.6 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ 5.0 5.1 5.2 5.3 Arriagada, Pamela (2011). "Chromospheric Activity of Southern Stars from the Magellan Planet Search Program". The Astrophysical Journal 734 (1): 70. doi:10.1088/0004-637X/734/1/70. Bibcode: 2011ApJ...734...70A.
- ↑ 6.0 6.1 6.2 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. doi:10.3847/1538-4357/aaab4d.
- ↑ 7.0 7.1 Glebocki, R.; Gnacinski, P. (2005). "VizieR Online Data Catalog: Catalog of Stellar Rotational Velocities (Glebocki+ 2005)". VizieR On-line Data Catalog: III/244. Originally Published in: 2005csss...13..571G; 2005yCat.3244....0G 3244. Bibcode: 2005yCat.3244....0G.
- ↑ "HD 133131". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+133131.
- ↑ "HD 133131A". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+133131A.
- ↑ "HD 133131B". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+133131B.
- ↑ Stock, J.; Wroblewski, H. (May 1972). "Double stars of equal components.". Astronomy and Astrophysics 18: 341. Bibcode: 1972A&A....18..341S.
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