HD 19467

HD 19467
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Eridanus[1]
Right ascension 03h 07m 18.575s[2]
Declination −13° 45′ 42.42″[2]
Apparent magnitude (V) 6.97[1]
Characteristics
Evolutionary stage main sequence[3]
Spectral type G3 V[4] + T5.5±1.0[3]
B−V color index 0.645±0.010[1]
Astrometry
Radial velocity (Rv)6.953±0.0003[5] km/s
Proper motion (μ) RA: −8.694 mas/yr[2]
Dec.: −260.642 mas/yr[2]
Parallax (π)31.2191 ± 0.024 mas[2]
Distance104.47 ± 0.08 ly
(32.03 ± 0.02 pc)
Absolute magnitude (MV)4.52[1]
Orbit[6]
PrimaryHD 19467 A
CompanionHD 19467 B
Period (P)398+95
−93 yr
Semi-major axis (a)54±9 AU
Eccentricity (e)0.56±0.09
Inclination (i)129.8+8.1
−5.1°
Longitude of the node (Ω)134.8±4.5°
Periastron epoch (T)2,512,264+12,428
−12,637 BJD
Argument of periastron (ω)
(secondary)		64.2+5.5
−6.3°
Details
HD 19467 A
Mass0.96±0.02[7] M☉
Radius1.20±0.03[7] R☉
Luminosity1.42±0.06[7] L☉
Surface gravity (log g)4.28±0.04[7] cgs
Temperature5,747±40[7] K
Metallicity [Fe/H]−0.11±0.01[6] dex
Rotation29.53±0.16 d[6]
Rotational velocity (v sin i)1.6±0.5[6] km/s
Age5.4+1.9
−1.3 Gyr[3]
10.06+1.16
−0.82[8] Gyr
HD 19467 B
Mass65.4+5.9
−4.6[3] MJup
Luminosity(6.49±0.98)×10−6[8] L☉
Temperature978+20
−43[9] K
Metallicity [Fe/H]−0.15±0.02[8] dex
Other designations
BD−14° 604, FK5 1087, GJ 3200, HD 19467, HIP 14501, SAO 148780, PPM 212460[10]
Database references
SIMBADdata

HD 19467 is a star with an orbiting brown dwarf companion in the equatorial constellation of Eridanus. It has an apparent visual magnitude of 6.97,[1] which is a challenge to view with the naked eye. The system is located at a distance of 104.5 light years based on parallax measurements,[2] and is drifting further away with a radial velocity of 7 km/s.[5] It has a high proper motion, traversing the celestial sphere at an angular rate of 0.258 arcsec yr−1.[11] Based on the motion and chemical abundances of this star it has been considered a likely member of the Wolf 630 group of co-moving stars, although its age estimate is inconsistent with that assignment.[12]

The spectrum of HD 19467 presents as a G-type main-sequence star with a stellar classification of G3 V.[4] It has been identified as a solar twin based on the similarity of its physical properties to the Sun.[13] This is an older star,[6] with age estimates range from 5.4[3] up to 10.1 billion years,[8] depending on the study. It is considered a thin disk star, which should theoretically limit the age to no more than 8 billion years.[6] The spin rate is correspondingly low with a rotation period of 29.5 days.[6] Based on the abundance of iron, the metallicity is lower than solar.[14][6] The level of magnetic activity in the star's chromosphere as well as X-ray emission are at most below the equivalent level in the Sun.[3]

  1. ^ a b c d e Cite error: The named reference Anderson_Francis_2012 was invoked but never defined (see the help page).
  2. ^ a b c d e Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  3. ^ a b c d e f Cite error: The named reference Brandt_et_al_2021 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Houk_Smith-Moore_1988 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Soubiran_et_al_2018 was invoked but never defined (see the help page).
  6. ^ a b c d e f g h Cite error: The named reference Maire_et_al_2020 was invoked but never defined (see the help page).
  7. ^ a b c d e Cite error: The named reference Greenbaum_et_al_2023 was invoked but never defined (see the help page).
  8. ^ a b c d Cite error: The named reference Wood_et_al_2019 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Crepp_et_al_2015 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Luyten1995 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Bubar_King_2010 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Ramírez_et_al_2014 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference Fuhrmann_Chini_2021 was invoked but never defined (see the help page).