HD 155358
HD 155358 is a low metallicity yellow dwarf star approximately 43 pc away in the constellation Hercules. This star is known to be orbited by two extrasolar planets.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Hercules |
| Right ascension | 17h 09m 34.61749s |
| Declination | +33° 21′ 21.0850″ |
| Apparent magnitude (V) | 7.275±0.005 |
| Characteristics | |
| Spectral type | G0 |
| B−V color index | 0.523 |
| Astrometry | |
| Radial velocity (Rv) | -9.1 km/s |
| Proper motion (μ) | RA: -222.45 mas/yr Dec.: -215.97 mas/yr |
| Parallax (π) | 22.67 ± 0.48 mas |
| Distance | 144 ± 3 ly (44.1 ± 0.9 pc) |
| Absolute magnitude (MV) | 4.12 |
| Details | |
| Mass | 0.83+0.03 −0.02 M☉ |
| Radius | 1.39±0.06 R☉ |
| Surface gravity (log g) | 4.05±0.10 cgs |
| Temperature | 5921±70 K |
| Metallicity | 21% solar |
| Age | 3.3+1.3 −1.6 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
The star is 11.9 billion years old and has a mass 0.89 times that of the Sun. At the time of the planets' discoveries, it was notable for being the lowest metallicity planet-bearing star known, with an iron-to-hydrogen ratio 21% of the solar value.
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