HD 29587
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Perseus |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | 7.29[2] |
| Characteristics | |
| Spectral type | G2 V[3] |
| B−V Template:Engvar | 0.633[3] |
| Astrometry | |
| Radial velocity (Rv) | Script error: No such module "val".[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 | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | 5.08[3] |
| Orbit[4] | |
| Period (P) | Script error: No such module "val". |
| Eccentricity (e) | 0.713±0.006[5] |
| Periastron epoch (T) | JD Script error: No such module "val". |
| Argument of periastron (ω) (secondary) | Script error: No such module "val".° |
| Semi-amplitude (K1) (primary) | Script error: No such module "val". km/s |
| Details[3] | |
| Mass | 1.033±0.010[5] Template:Solar mass |
| Luminosity | 0.798Script error: No such module "Su". Template:Solar luminosity |
| Surface gravity (log g) | Script error: No such module "val". cgs |
| Temperature | Script error: No such module "val". K |
| Metallicity [Fe/H] | Script error: No such module "val". dex |
| Age | Script error: No such module "val". Gyr |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[6] | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
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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 Script error: No such module "val".,[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 Script error: No such module "convert". 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]
Planetary system
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 Script error: No such module "convert".,[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 Script error: No such module "val"., making it a probable brown dwarf.[10]
Template:OrbitboxPlanet begin Template:OrbitboxPlanet
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References
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