| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Virgo |
| Right ascension | 12h 00m 44.45136s[1] |
| Declination | –10° 26′ 45.6527″[1] |
| Apparent magnitude (V) | 5.54[2] |
| Characteristics | |
| Spectral type | G8 IV[3] / M4V[4] |
| U−B color index | +0.43[2] |
| B−V color index | +0.76[2] |
| Astrometry | |
| Radial velocity (Rv) | 0.4 km/s |
| Proper motion (μ) | RA: 141.75[1] mas/yr Dec.: -483.64[1] mas/yr |
| Parallax (π) | 78.35 ± 0.31[1] mas |
| Distance | 41.6 ± 0.2 ly (12.76 ± 0.05 pc) |
| Details | |
| Mass | 1.01/0.21+0.03 −0.02[4] M☉ |
| Surface gravity (log g) | 4.35[3] |
| Temperature | 5,538[3] K |
| Metallicity [Fe/H] | 0.18[5] dex |
| Rotational velocity (v sin i) | 4.5[6] km/s |
| Age | 8.5[4] Gyr |
| Other designations | |
HR 4587 (24 G. Virginis) is a binary star in the zodiac constellation Virgo. It has an apparent magnitude of 5.54, making it visible to the unaided eye under suitable viewing conditions. The stellar classification of G8 IV means that this is a subgiant star that has left the main sequence and has begun to evolve into a giant star. In 2007, a candidate planet was announced orbiting this star. This was updated in 2011 when the companion was found to be a star. It is believed to have a mass of 0.21 solar masses (83 Jupiters), an orbital period of 17,715 days with an eccentricity of 0.29.[4][7] Further measurement will be needed to determine whether the star has a planetary companion.