HD 159868

HD 159868
Observation data
Epoch J2000      Equinox J2000
Constellation Scorpius[1]
Right ascension 17h 38m 59.5264s[2]
Declination −43° 08′ 43.8443″[2]
Apparent magnitude (V) +7.24[3]
Characteristics
Spectral type G5V[4]
Apparent magnitude (J) 5.941±0.021[5]
Apparent magnitude (H) 5.567±0.026[5]
Apparent magnitude (K) 5.535±0.024[5]
B−V color index 0.714±0.012[3]
Astrometry
Radial velocity (Rv)−23.80±0.76[3] km/s
Proper motion (μ) RA: −230.510[2] mas/yr
Dec.: −167.766[2] mas/yr
Parallax (π)17.8763 ± 0.0530 mas[2]
Distance182.5 ± 0.5 ly
(55.9 ± 0.2 pc)
Absolute magnitude (MV)+3.63[6]
Details[6]
Mass1.087+0.032
−0.033 M☉[6]
1.123±0.018[7] M☉
Radius1.97±0.04 R☉[7]
2.03+0.05
−0.04[2] R☉
Luminosity3.59±0.02[2] L☉
Surface gravity (log g)3.96±0.02 cgs
Temperature5,558±15 K
Metallicity [Fe/H]−0.08±0.01 dex
Rotational velocity (v sin i)2.1 km/s
Age6.6±0.2[7] Gyr
Other designations
CD−43°11901, GJ 4014, HD 159868, HIP 86375, SAO 228234[8]
Database references
SIMBADdata

HD 159868 is a star in the southern constellation of Scorpius, positioned about 0.3° to the ESE of the bright star Theta Scorpii.[9] With an apparent visual magnitude of +7.24,[3] it is too faint to be visible to the naked eye but can be viewed with a small telescope. The star lies at a distance of 183 light years from the Sun based on parallax, but is drifting closer with a radial velocity of −24 km/s.[3]

The spectrum of this object matches a G-type main-sequence star with a stellar classification of G5V. It has a relatively low surface gravity for its class, which suggests it is slightly evolved off the main sequence. The star is chromospherically inactive with a slow rotation rate, having a projected rotational velocity of 2.1 km/s.[6] It is an estimated 6.6[7] billion years old with 8–12% more mass than the Sun and nearly double the Sun's radius. The star is radiating 3.6 times the luminosity of the Sun from its photosphere at an effective temperature of 5,558 K.[2]

  1. ^ Cite error: The named reference Roman1987 was invoked but never defined (see the help page).
  2. ^ a b c d e f g h Cite error: The named reference Gaia DR2 was invoked but never defined (see the help page).
  3. ^ a b c d e Cite error: The named reference Anderson_Francis_2012 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Houk1978 was invoked but never defined (see the help page).
  5. ^ a b c Cite error: The named reference Skrutskie2006 was invoked but never defined (see the help page).
  6. ^ a b c d Cite error: The named reference Wittenmyer_et_al_2012 was invoked but never defined (see the help page).
  7. ^ a b c d Cite error: The named reference DelgadoMena_et_al_2019 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 Sinnott_Perryman_1997 was invoked but never defined (see the help page).