Gliese 849
Star in the constellation Aquarius / From Wikipedia, the free encyclopedia
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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.[2] The distance to this star is 28.8 light-years (8.8 parsecs) based on parallax,[1] but it is drifting closer to the Sun with a radial velocity of −15.3 km/s.[2] It has a pair of confirmed gas giant companions.[8]
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Aquarius |
Right ascension | 22h 09m 40.34431s[1] |
Declination | –04° 38′ 26.6508″[1] |
Apparent magnitude (V) | 10.41[2] |
Characteristics | |
Evolutionary stage | Main sequence[3] |
Spectral type | M3.5V[4] |
U−B color index | 1.055[2] |
B−V color index | 1.531±0.035[2] |
V−R color index | 1.12[2] |
R−I color index | 1.41[2] |
Astrometry | |
Radial velocity (Rv) | −15.26±0.10[2] km/s |
Proper motion (μ) | RA: 1,132.583(39) mas/yr[1] Dec.: −22.157(37) mas/yr[1] |
Parallax (π) | 113.4447 ± 0.0300 mas[1] |
Distance | 28.750 ± 0.008 ly (8.815 ± 0.002 pc) |
Absolute magnitude (MV) | 10.62[2] |
Details[5] | |
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[6] K |
Metallicity [Fe/H] | 0.09±0.09[6] dex |
Rotation | 40.45+0.19 −0.18 d[6] |
Rotational velocity (v sin i) | 2.4[3] km/s |
Other designations | |
Database references | |
SIMBAD | data |
Exoplanet Archive | data |
ARICNS | data |
Planet | |
Gliese 849b | data Archived 2019-06-05 at the Wayback Machine |
The stellar classification of GJ 849 is M3.5V,[4] 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,[8] 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,[3] and is spinning slowly with a rotation period of approximately 39 days.[9] The estimated age of the star is more than three billion years.[3] It is radiating a mere 2.9%[5] of the luminosity of the Sun from its photosphere at an effective temperature of 3,490 K.[5]