HD 29587

HD 29587
Observation data
Epoch J2000      Equinox J2000
Constellation Perseus
Right ascension 04h 41m 36.31645s[1]
Declination +42° 07′ 06.4209″[1]
Apparent magnitude (V) 7.29[2]
Characteristics
Spectral type G2 V[3]
B−V color index 0.633[3]
Astrometry
Radial velocity (Rv)+112.67±0.20[1] km/s
Proper motion (μ) RA: +534.004[1] mas/yr
Dec.: −414.768[1] mas/yr
Parallax (π)36.3130 ± 0.0697 mas[1]
Distance89.8 ± 0.2 ly
(27.54 ± 0.05 pc)
Absolute magnitude (MV)5.08[3]
Orbit[4]
Period (P)1,474.9±10.2 d
Eccentricity (e)0.713±0.006[5]
Periastron epoch (T)JD 2,447,763.5±45.8
Argument of periastron (ω)
(secondary)		80.2±13.3°
Semi-amplitude (K1)
(primary)		1.02±0.16 km/s
Details[3]
Mass1.033±0.010[5] M☉
Luminosity0.798+0.040
−0.038 L☉
Surface gravity (log g)4.54±0.22 cgs
Temperature5,709±35 K
Metallicity [Fe/H]−0.51±0.05 dex
Age14.7+3.8
−2.7 Gyr
Other designations
BD+41° 931, FK5 4419, HD 29587, HIP 21832, SAO 39690, TYC 2901-00064-1, 2MASS J04413631+4207065[6]
Database references
SIMBADdata
Exoplanet Archivedata

HD 29587 is a Sun-like[7] star with a candidate brown dwarf companion[8] in the northern constellation of Perseus. It has an apparent visual magnitude of 7.29,[2] which means it is too faint to be viewed with the naked eye. Based upon an annual parallax shift of 36.3 mas,[1] it is located 89.8 light years away. The star is moving away from the Earth with a heliocentric radial velocity of +113 km/s,[1] having come to within 55.8 ly some 148,000 years ago.[2] It is a hyper-velocity halo[7] star moving at a rate of 170 km/s relative to the local standard of rest.[9]

This ancient star has a stellar classification of G2 V,[3] matching a G-type main-sequence star. It has 78% of the mass of the Sun and is radiating 80% of the Sun's luminosity from its photosphere at an effective temperature of 5,709 K.[3]

  1. ^ a b c d e f g h Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b c d e f Cite error: The named reference DaSilva2015 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Halbwachs2000 was invoked but never defined (see the help page).
  5. ^ a b Kiefer, F.; et al. (2019), "Detection and characterisation of 54 massive companions with the SOPHIE spectrograph", Astronomy & Astrophysics, 631: A125, arXiv:1909.00739, doi:10.1051/0004-6361/201935113, S2CID 202538098
  6. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Fossati2015 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Mazeh1996 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Hobbs1987 was invoked but never defined (see the help page).