HD 156279
HD 156279 is a star with a pair of orbiting exoplanets located in the northern constellation of Draco. It has various alternate designations, including HIP 84171 and BD+63 1335. Parallax measurements yield a distance of 118 light years from the Sun, but it is drifting closer with a radial velocity of −20 km/s. Despite an absolute magnitude of 5.25, at that distance the star is too faint to be visible to the naked eye with an apparent visual magnitude of 8.17. It is presumed to be a single star, as in 2019 all imaging surveys have failed to find any stellar companions.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Draco |
| Right ascension | 17h 12m 23.204816s |
| Declination | +63° 21′ 07.531205″ |
| Apparent magnitude (V) | 8.167±0.013 |
| Characteristics | |
| Evolutionary stage | main-sequence |
| Spectral type | K0 or G6 |
| Apparent magnitude (R) | 7.60 |
| Apparent magnitude (G) | 7.8657 |
| Apparent magnitude (J) | 6.677±0.018 |
| B−V color index | 0.801±0.014 |
| Astrometry | |
| Radial velocity (Rv) | −20.144±0.161 km/s |
| Proper motion (μ) | RA: −1.879±0.024 mas/yr Dec.: 160.429±0.027 mas/yr |
| Parallax (π) | 27.6756 ± 0.0200 mas |
| Distance | 117.85 ± 0.09 ly (36.13 ± 0.03 pc) |
| Absolute magnitude (MV) | 5.25 |
| Details | |
| Mass | 0.93±0.02 M☉ |
| Radius | 0.94±0.02 R☉ |
| Luminosity | 0.70±0.01 L☉ |
| Surface gravity (log g) | 4.45±0.03 cgs |
| Temperature | 5,449±31 K |
| Metallicity [Fe/H] | 0.14±0.01 dex |
| Rotational velocity (v sin i) | 2.51±1 km/s |
| Age | 7.4±2.2 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
The spectrum of HD 156279 has a stellar classification of G6 or K0, depending on the study. Hence it presents as an ordinary main sequence star of the late G-type or early K-type. The star has 93% of the mass of the Sun and 94% of the Sun's radius. HD 156279 is roughly seven billion years old and is spinning with a projected rotational velocity of 2.5 km/s. Based on the abundance of iron, this star is slightly enriched in heavy elements, having 140% of the solar abundance. It is radiating 70% of the luminosity of the Sun from its photosphere at an effective temperature of 5,449 K.