HD 141937

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]

HD 141937

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
BD−17° 4442, HD 141937, HIP 77740, SAO 159551[5]
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 M_J. In 2020, the inclination of the orbit was measured, revealing its true mass to be 27.4 M_J, 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]

The HD 141937 planetary system^[9][10][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°	—

See also

• HD 142022
• HD 142415
• List of extrasolar planets