Gliese 832
Gliese 832 (Gl 832 or GJ 832) is a red dwarf of spectral type M2V in the southern constellation Grus. The apparent visual magnitude of 8.66 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 and has a high proper motion of 818.16 milliarcseconds per year. Gliese 832 has just under half the mass and radius of the Sun. Its estimated rotation period is a relatively leisurely 46 days. The star is roughly 6 billion years old.
Gliese 832 Location of Gliese 832 in the constellation Grus | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Grus |
| Right ascension | 21h 33m 33.97512s |
| Declination | −49° 00′ 32.3994″ |
| Apparent magnitude (V) | 8.66 |
| Characteristics | |
| Evolutionary stage | main-sequence star |
| Spectral type | M2V |
| B−V color index | 1.52 |
| Astrometry | |
| Radial velocity (Rv) | 12.72±0.13 km/s |
| Proper motion (μ) | RA: −45.917 mas/yr Dec.: −816.875 mas/yr |
| Parallax (π) | 201.3252 ± 0.0237 mas |
| Distance | 16.200 ± 0.002 ly (4.9671 ± 0.0006 pc) |
| Absolute magnitude (MV) | 10.19 |
| Details | |
| Mass | 0.441 ± 0.011 M☉ |
| Radius | 0.442 ± 0.018 R☉ |
| Luminosity (bolometric) | 0.0276 ± 0.0009 L☉ |
| Luminosity (visual, LV) | 0.007 L☉ |
| Surface gravity (log g) | 4.7 cgs |
| Temperature | 3,539+79 −74 K |
| Metallicity [Fe/H] | −0.06 ± 0.04 dex |
| Rotation | 37.5+1.4 −1.5 d |
| Age | 6±1.5 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.
Gliese 832 emits X-rays. 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.