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 |
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.
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]
In 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 | — | — |
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 |
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.
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]
In 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 | — | — |