Ross 128

Ross 128

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(34) mas/yr[2]
Dec.: −1223.028(23) mas/yr[2]
Parallax (π)296.3053 ± 0.0302 mas[2]
Distance11.007 ± 0.001 ly
(3.3749 ± 0.0003 pc)
Absolute magnitude (MV)13.53[3]
Details
Mass0.176±0.004[10] M☉
Radius0.198±0.007[10] R☉
Luminosity (bolometric)0.00366 ± 0.00005[10] L☉
Surface gravity (log g)3.40[11] cgs
Temperature3,189+55
−53[10] K
Metallicity [Fe/H]−0.02±0.08[12] dex
Rotation101–223 days[13]
Rotational velocity (v sin i)2.1±1.0[14] km/s
Age5.0[15] Gyr
Other designations
FI Vir, GJ 447, HIP 57548, G 10-50, LFT 852, LHS 315, LSPM J1147+0048, LTT 13240, PLX 2730, Ross 128, Vyssotsky 286[16]
Database references
SIMBADdata
Ross 128 is located in the constellation Virgo.
Ross 128 is located in the constellation Virgo.
 Ross 128
Location of Ross 128 in the constellation Virgo

Ross 128 is a red dwarf star 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.[17]

  1. ^ Cite error: The named reference eso was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference RECONS was invoked but never defined (see the help page).
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  5. ^ Cite error: The named reference aass26_275 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference warren1978 was invoked but never defined (see the help page).
  7. ^ Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007–2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
  8. ^ Cite error: The named reference PCRV was invoked but never defined (see the help page).
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  10. ^ a b c d Cite error: The named reference Pineda2021 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference rodono was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Mannetal2015 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Liebing2024 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference fouque2018 was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference mcintyre2022 was invoked but never defined (see the help page).
  16. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  17. ^ Cite error: The named reference aj36_856_124 was invoked but never defined (see the help page).