Gliese 832

Gliese 832

Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Grus
Right ascension	21h 33m 33.9750s[1]
Declination	−49° 00′ 32.4035″[1]
Apparent magnitude (V)	8.66[2]
Characteristics
Evolutionary stage	main-sequence star
Spectral type	M2V[3]
B−V color index	1.52[2]
Astrometry
Radial velocity (Rv)	18.0 km/s
Proper motion (μ)	RA: −45.834±0.071[1] mas/yr Dec.: −816.604±0.064[1] mas/yr
Parallax (π)	201.3252 ± 0.0237[4] mas
Distance	16.200 ± 0.002 ly (4.9671 ± 0.0006 pc)
Absolute magnitude (MV)	10.19[2]
Details
Mass	0.45 ± 0.05[2] M☉
Radius	0.48[5] R☉
Luminosity (bolometric)	0.035[note 1] L☉
Luminosity (visual, LV)	0.007[note 2] L☉
Surface gravity (log g)	4.7[2] cgs
Temperature	3,620[8] K
Metallicity [Fe/H]	−0.06±0.04[9] dex
Rotation	45.7±9.3 d[3]
Age	9.24[10] Gyr
Other designations
CD-49°13515, HD 204961, HIP 106440, LHS 3685, PLX 5190[11]
Database references
SIMBAD	The star
	planet c
	planet b
Exoplanet Archive	data
Extrasolar Planets Encyclopaedia	data
Data sources:
Hipparcos Catalogue, HD
Gliese 832 Location of Gliese 832 in the constellation Grus

Gliese 832 (Gl 832 or GJ 832) is a red dwarf of spectral type M2V in the southern constellation Grus.^[12] The apparent visual magnitude of 8.66^[2] means that it is too faint to be seen with the naked eye. It is located relatively close to the Sun, at a distance of 16.2 light years^[1] and has a high proper motion of 818.93 milliarcseconds^[13] per year.^[1] Gliese 832 has just under half the mass and radius of the Sun.^[12] Its estimated rotation period is a relatively leisurely 46 days.^[3] The star is roughly 9.5 billion years old.^[10]

This star achieved perihelion some 52,920 years ago when it came within an estimated 15.71 ly (4.817 pc) of the Sun.^[13]

Gliese 832 emits X-rays.^[14] Despite the strong flare activity, Gliese 832 is producing on average less ionizing radiation than the Sun. Only at extremely short radiation wavelengths (<50nm) does its radiation intensity rise above the level of quiet Sun, but does not reach levels typical for active Sun.^[15]

Planetary system[]

Gliese 832 hosts two known planets.