Gliese 180

Gliese 180
Observation data
Epoch J2000      Equinox J2000
Constellation Eridanus
Right ascension 04h 53m 49.97992s[1]
Declination −17° 46′ 24.3093″[1]
Apparent magnitude (V) 10.894[2]
Characteristics
Spectral type M2V[3] or M3V[4]
U−B color index 1.155[2]
B−V color index 1.549[2]
V−R color index 1.018[2]
R−I color index 1.205[2]
J−H color index 0.553[2]
J−K color index 0.815[2]
Astrometry
Radial velocity (Rv)−14.87±0.14[1] km/s
Proper motion (μ) RA: 408.573±0.012 mas/yr[1]
Dec.: −644.457±0.013 mas/yr[1]
Parallax (π)83.6897 ± 0.0160 mas[1]
Distance38.972 ± 0.007 ly
(11.949 ± 0.002 pc)
Absolute magnitude (MV)10.48[2]
Details
Mass0.4316±0.0050[3] M☉
Radius0.4229±0.0047[3] R☉
Luminosity0.02427±0.00036[3] L☉
Surface gravity (log g)4.73+0.05
−0.07[5] cgs
Temperature3,634+57
−40[5] K
Metallicity [Fe/H]−0.12±0.16[3] dex
Rotation65 days[6]
Rotational velocity (v sin i)3.4+1.9
−0.8[5] km/s
Age5.0[7] Gyr
Other designations
GJ 180, HIP 22762, L 736-30, LFT 377, LHS 1712, LP 776-27, LPM 198, LTT 2116, NLTT 14144, PLX 1097, TYC 5903-680-1, 2MASS J04534995-1746235,[8] [RHG95] 838
Database references
SIMBADdata
Exoplanet Archivedata
ARICNSdata

Gliese 180 (often shortened to GJ 180), is a small red dwarf star in the equatorial constellation of Eridanus. It is invisible to the naked eye with an apparent visual magnitude of 10.9.[2] The star is located at a distance of 39 light years from the Sun based on parallax,[1] and is drifting closer with a radial velocity of −14.6 km/s.[9] It has a high proper motion, traversing the sky at the rate of 0.765 arcseconds per year.[10]

The stellar classification of GJ 180 is catalogued as M2V[3] or M3V,[4] depending on the study, which indicates this is a dim red dwarf – an M-type main-sequence star that is generating energy by core hydrogen fusion. Reiners and associates (2012) do not consider it to be an active star.[11] It is about five[7] billion years old and is spinning with a projected rotational velocity of ~3 km/s,[5] giving it a rotation period of about 65 days.[6] The star has 43% of the Sun's mass and 42% of the radius of the Sun. It is radiating just 2.4%[3] of the luminosity of the Sun from its photosphere at an effective temperature of 3,634 K.[5]

  1. ^ a b c d e f Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  2. ^ a b c d e f g h i Cite error: The named reference JHK was invoked but never defined (see the help page).
  3. ^ a b c d e f g Cite error: The named reference Schweitzer_et_al_2019 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Stephenson1986 was invoked but never defined (see the help page).
  5. ^ a b c d e Cite error: The named reference Passegger_et_al_2020 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference AstudilloDefru_et_al_2017 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Miles_Shkolnik_2017 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Anderson_Francis_2012 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Luyten1979 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Reiners_et_al_2012 was invoked but never defined (see the help page).