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Star in the constellation Libra From Wikipedia, the free encyclopedia
HD 141937 is a star in the southern zodiac constellation of Libra, positioned a couple of degrees to the north of Lambda Librae. It is a yellow-hued star with an apparent visual magnitude of 7.25,[2] which means it is too faint to be seen with the naked eye. This object is located at a distance of 108.9 light years from the Sun based on parallax,[1] but is drifting closer with a radial velocity of −2.2 km/s.[2] It has an absolute magnitude of 4.71.[2]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Libra |
Right ascension | 15h 52m 17.54814s[1] |
Declination | −18° 26′ 09.7939″[1] |
Apparent magnitude (V) | 7.25[2] |
Characteristics | |
Spectral type | G1V[3] |
B−V color index | +0.628±0.002[2] |
Astrometry | |
Radial velocity (Rv) | −2.20±0.68[2] km/s |
Proper motion (μ) | RA: +97.231±0.133[1] mas/yr Dec.: +19.113±0.116[1] mas/yr |
Parallax (π) | 29.9453 ± 0.0640 mas[1] |
Distance | 108.9 ± 0.2 ly (33.39 ± 0.07 pc) |
Absolute magnitude (MV) | 4.71[2] |
Details | |
Mass | 1.03[4] M☉ |
Radius | 1.05[1] R☉ |
Luminosity | 1.202±0.003[1] L☉ |
Surface gravity (log g) | 4.44[4] cgs |
Temperature | 5,890+15 −30[1] K |
Metallicity [Fe/H] | +0.10±0.01[2] dex |
Rotational velocity (v sin i) | 6.0[2] km/s |
Age | 3.82[4] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
This is a G-type main-sequence star with a stellar classification of G1V.[3] It is a solar-type star with slightly higher mass and radius compared to the Sun. The metallicity is higher than solar. It is an estimated 3.8[4] billion years old and is spinning with a projected rotational velocity of 6 km/s.[6] The star is radiating 1.2 times the luminosity of the Sun from its photosphere at an effective temperature of 5,890 K.[1]
The star has a substellar companion (HD 141937 b) announced in April 2001 by the European Southern Observatory. It has a minimum mass of 9.7 MJ. In 2020, the inclination of the orbit was measured, revealing its true mass to be 27.4 MJ, which makes it a brown dwarf. A 653-day orbit places the orbital distance 1.5 times farther away from the star as Earth is from the Sun, with a high eccentricity of 41%.[7][8]
Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b | 27.42+6.78 −9.86 MJ |
1.4877±0.0018 | 653.22±1.21 | 0.41±0.01 | 20.52+12.47 −4.16° |
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