- Source: HD 29587
HD 29587 is a Sun-like star with a candidate brown dwarf companion in the northern constellation of Perseus. It has an apparent visual magnitude of 7.29, which means it is too faint to be viewed with the naked eye. Based upon an annual parallax shift of 36.3 mas, 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, having come to within 55.8 ly some 148,000 years ago. It is a hyper-velocity halo star moving at a rate of 170 km/s relative to the local standard of rest.
This ancient star has a stellar classification of G2 V, 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.
Planetary system
Formerly an IAU radial velocity standard, this star was found to have a variable radial velocity due to a suspected orbiting companion. The a sin i value for the unseen object is 0.0957 ± 0.0108 AU (14.31 ± 1.62 Gm), 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.
