Gliese 849
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Aquarius |
| Right ascension | 22h 09m 40.34431s |
| Declination | −04° 38′ 26.6508″ |
| Apparent magnitude (V) | 10.41 |
| Characteristics | |
| Evolutionary stage | Main sequence |
| Spectral type | M3.5V |
| U−B color index | 1.055 |
| B−V color index | 1.531±0.035 |
| V−R color index | 1.12 |
| R−I color index | 1.41 |
| Astrometry | |
| Radial velocity (Rv) | −15.26±0.10 km/s |
| Proper motion (μ) | RA: 1,132.583(39) mas/yr Dec.: −22.157(37) mas/yr |
| Parallax (π) | 113.4447±0.0300 mas |
| Distance | 28.750 ± 0.008 ly (8.815 ± 0.002 pc) |
| Absolute magnitude (MV) | 10.62 |
| Details | |
| Mass | 0.465±0.011 M☉ |
| Radius | 0.464±0.018 R☉ |
| Luminosity | 0.02887±0.00025 L☉ |
| Surface gravity (log g) | 4.771±0.032 cgs |
| Temperature | 3,467±68 K |
| Metallicity [Fe/H] | 0.09±0.09 dex |
| Rotation | 40.45+0.19 −0.18 d |
| Rotational velocity (v sin i) | 2.4 km/s |
| Other designations | |
| BD−05°5715, GJ 849, HIP 109388, LFT 1689, LHS 517, LPM 814, LTT 8889, NLTT 53078, GCRV 13921, 2MASS J22094029-0438267 | |
| Database references | |
| SIMBAD | The star |
| planet b | |
| planet c | |
| Exoplanet Archive | data |
| ARICNS | data |
Gliese 849, or GJ 849, is a small, solitary star in the equatorial constellation of Aquarius. It has a reddish hue and is invisible to the naked eye with an apparent visual magnitude of 10.41. The distance to this star is 28.8 light-years (8.8 parsecs) based on parallax, but it is drifting closer to the Sun with a radial velocity of −15.3 km/s. It has a pair of confirmed gas giant companions.
The stellar classification of GJ 849 is M3.5V, which means this is a small red dwarf star generating energy through hydrogen fusion at its core region. Various studies have found super-solar abundances in the spectra, indicating that the elemental abundances of higher mass elements is significantly higher than in the Sun. The star has about half the mass and size of the Sun, and is spinning slowly with a rotation period of approximately 39 days. The estimated age of the star is more than three billion years. It is radiating a mere 2.9% of the luminosity of the Sun from its photosphere at an effective temperature of 3,490 K.