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Star in the constellation Perseus From Wikipedia, the free encyclopedia
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]
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] |
Distance | 89.8 ± 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] | |
Mass | 1.033±0.010[5] M☉ |
Luminosity | 0.798+0.040 −0.038 L☉ |
Surface gravity (log g) | 4.54±0.22 cgs |
Temperature | 5,709±35 K |
Metallicity [Fe/H] | −0.51±0.05 dex |
Age | 14.7+3.8 −2.7 Gyr |
Other designations | |
Database references | |
SIMBAD | data |
Exoplanet Archive | data |
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]
Formerly an IAU radial velocity standard, this star was found to have a variable radial velocity due to a suspected orbiting companion.[8] The a sin i value for the unseen object is 0.0957 ± 0.0108 AU (14.31 ± 1.62 Gm),[4] where a is the semimajor axis and i is the orbital inclination – providing a lower bound for the semimajor axis. The secondary object most likely has a mass in the range 41.0–97.8 MJ, making it a probable brown dwarf.[10]
Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b | ≥ 55.2±9.2[5] MJ | ≥0.0957±0.0108 | 1,474.9±10.2 | 0.356±0.095 | — | — |
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