![]() Artist's impression of the planet Ross 128 b, with the star Ross 128 visible in the background[1] Credit: European Southern Observatory | |
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Virgo |
Right ascension | 11h 47m 44.39727s[2] |
Declination | +00° 48′ 16.4003″[2] |
Apparent magnitude (V) | 11.13[3] |
Characteristics | |
Evolutionary stage | Main sequence |
Spectral type | M4V[4] |
U−B color index | +2.685[5] |
B−V color index | +1.59[6] |
Variable type | Flare star[7] |
Astrometry | |
Radial velocity (Rv) | −31.0[8][9] km/s |
Proper motion (μ) | RA: 607.299±0.034 mas/yr[2] Dec.: −1223.028±0.023 mas/yr[2] |
Parallax (π) | 296.3053 ± 0.0302 mas[2] |
Distance | 11.007 ± 0.001 ly (3.3749 ± 0.0003 pc) |
Absolute magnitude (MV) | 13.53[3] |
Details | |
Mass | 0.176±0.004[10] M☉ |
Radius | 0.198±0.007[10] R☉ |
Luminosity (bolometric) | 0.00366 ± 0.00005[10] L☉ |
Surface gravity (log g) | 3.40[11] cgs |
Temperature | 3,189+55 −53[10] K |
Metallicity [Fe/H] | −0.02±0.08[12] dex |
Rotational velocity (v sin i) | 2.1±1.0[13] km/s |
Age | 5.0[14] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
Location of Ross 128 in the constellation Virgo |
Ross 128 is a red dwarf in the equatorial zodiac constellation of Virgo, near β Virginis. The apparent magnitude of Ross 128 is 11.13,[3] which is too faint to be seen with the unaided eye. Based upon parallax measurements, the distance of this star from Earth is 11.007 light-years (3.375 parsecs), making it the twelfth closest stellar system to the Solar System. It was first cataloged in 1926 by American astronomer Frank Elmore Ross.[16]
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