Gliese 876

Gliese 876
Observation data
Epoch J2000.0      Equinox J2000.0
Right ascension22h 53m 16.7324s[1]
Declination−14° 15′ 49.304″[1]
Apparent magnitude (V)10.15[2]
Spectral typeM4V[3]
U−B color index1.15[citation needed]
B−V color index1.59[citation needed]
V−R color index0.30[citation needed]
R−I color index1.22[citation needed]
Variable typeBY Draconis[4]
Radial velocity (Rv)–1.519 ± 0.157[5] km/s
Proper motion (μ) RA: 957.933±0.112[1] mas/yr
Dec.: −673.633±0.081[1] mas/yr
Parallax (π)214.6 ± 0.2[6][note 1] mas
Distance15.20 ± 0.01 ly
(4.660 ± 0.004 pc)
Absolute magnitude (MV)11.79[citation needed]
Mass0.37[7] M
Radius0.3761±0.0059[7] R
Luminosity0.0122±0.0002[7] L
Surface gravity (log g)4.89[8] cgs
Temperature3129±19[7] K
Metallicity [Fe/H]+0.19 ± 0.17[9] dex
Rotation96.9[10] days
Rotational velocity (v sin i)0.16,[10] km/s
Age0.1–9.9[10][11] Gyr
Other designations
BD-15°6290, G 156-057, GCTP 5546.00, HIP 113020, IL Aquarii, LHS 530, Ross 780, Vys 337
Database references

Gliese 876 is a red dwarf approximately 15 light-years away from Earth in the constellation of Aquarius.

It is the one of the closest known stars to the Sun confirmed to possess a planetary system and the fifth closest such system known to consist of multiple planets (after Wolf 1061, Kapteyn's Star, Tau Ceti and Epsilon Eridani). As of 2018, four extrasolar planets have been found to orbit the star.

The planetary system is also notable for the orbital properties of its planets. It is the only known system of orbital companions to exhibit a triple conjunction in the rare phenomenon of Laplace resonance (a type of resonance first noted in Jupiter's inner three Galilean moons). It is also the first extrasolar system around a normal star with measured coplanarity.

Two of the middle planets are located in the system's habitable zone; however, they are giant planets believed to be analogous to Jupiter.

Distance and visibility

Gliese 876 is located fairly close to the Solar System. According to astrometric measurements made by the Hipparcos satellite, the star shows a parallax of 213.28 milliarcseconds,[2] which corresponds to a distance of 4.69 parsecs (15.3 ly), currently making it the third-closest known star with orbiting planets, after Epsilon Eridani and Gliese 674.[10] Despite being located so close to Earth, the star is so faint that it is invisible to the naked eye and can only be seen using a telescope.

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中文: 格利澤876