HD 106252
HD 106252 is a star with a brown dwarf companion in the constellation Virgo. An apparent visual magnitude of 7.41 means this star is too faint to be visible to the naked eye. It is located at a distance of 210 light years from the Sun based on parallax measurements, and is receding with a radial velocity of 15 km/s.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Virgo |
| Right ascension | 12h 13m 29.510s |
| Declination | +10° 02′ 29.88″ |
| Apparent magnitude (V) | 7.41 |
| Characteristics | |
| Spectral type | G0V |
| B−V color index | 0.635±0.007 |
| Astrometry | |
| Radial velocity (Rv) | 15.44±0.11 km/s |
| Proper motion (μ) | RA: 22.863 mas/yr Dec.: −280.009 mas/yr |
| Parallax (π) | 15.533 ± 0.0048 mas |
| Distance | 209.98 ± 0.06 ly (64.38 ± 0.02 pc) |
| Absolute magnitude (MV) | 4.53 |
| Details | |
| Mass | 1.05±0.02 M☉ |
| Radius | 1.096 R☉ |
| Luminosity | 1.328±0.030 L☉ |
| Surface gravity (log g) | 4.40±0.15 cgs |
| Temperature | 5,890±50 K |
| Metallicity [Fe/H] | −0.06±0.04 dex |
| Rotation | 22.8 d |
| Rotational velocity (v sin i) | 1.74±0.25 km/s |
| Age | 3.00+0.8 −0.6 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
The stellar classification of HD 106252 is G0V, matching an ordinary G-type main-sequence star. It has 5% more mass than the Sun and 10% greater in girth. This star is about three billion years old with a low level of magnetic activity and is spinning with a projected rotational velocity of 2 km/s. It is radiating 1.3 times the luminosity of the Sun from its photosphere at an effective temperature of 5,890 K.
In 2001, a massive sub-stellar companion was announced orbiting the star by the European Southern Observatory. The discovery was confirmed by a different team using the Lick Telescope. Astrometric observations from Hipparcos in 2011 suggested that its true mass is likely around 30.6 MJ, in the brown dwarf range. More accurate astrometry from Gaia in 2021 revealed a smaller true mass of 10.0 MJ.
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (years) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 10.00+0.78 −0.73 MJ |
2.655±0.017 | 4.202+0.011 −0.010 |
0.480±0.010 | 46.0+4.9 −4.1° |
— |