Gliese 832
Star in the constellation Grus / From Wikipedia, the free encyclopedia
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Gliese 832 (Gl 832 or GJ 832) is a red dwarf of spectral type M2V in the southern constellation Grus.[8] 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 818.16 milliarcseconds per year.[1] Gliese 832 has just under half the mass and radius of the Sun.[8] Its estimated rotation period is a relatively leisurely 46 days.[3] The star is roughly 6 billion years old.[6]
Location of Gliese 832 in the constellation Grus | |
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Grus |
Right ascension | 21h 33m 33.97512s[1] |
Declination | −49° 00′ 32.3994″[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) | 12.72±0.13[1] km/s |
Proper motion (μ) | RA: −45.917 mas/yr[1] Dec.: −816.875 mas/yr[1] |
Parallax (π) | 201.3252 ± 0.0237 mas[1] |
Distance | 16.200 ± 0.002 ly (4.9671 ± 0.0006 pc) |
Absolute magnitude (MV) | 10.19[2] |
Details | |
Mass | 0.441 ± 0.011[4] M☉ |
Radius | 0.442 ± 0.018[4] R☉ |
Luminosity (bolometric) | 0.0276 ± 0.0009 [4] L☉ |
Luminosity (visual, LV) | 0.007[note 1] L☉ |
Surface gravity (log g) | 4.7[2] cgs |
Temperature | 3,539+79 −74[4] K |
Metallicity [Fe/H] | −0.06 ± 0.04[5] dex |
Rotation | 37.5+1.4 −1.5 d[6] |
Age | 6±1.5[6] Gyr |
Other designations | |
Database references | |
SIMBAD | The star |
planet c | |
planet b | |
Exoplanet Archive | data |
Data sources: | |
Hipparcos Catalogue, HD |
This star achieved perihelion some 52,920 years ago when it came within an estimated 15.71 ly (4.817 pc) of the Sun.[9]
Gliese 832 emits X-rays.[10] 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.[11]