HD 149026
HD 149026, also named Ogma /ˈɒɡmə/, is a yellow subgiant star approximately 250 light-years from the Sun in the constellation of Hercules. An extrasolar planet (designated HD 149026 b, later named Smertrios) is believed to orbit the star.
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Hercules |
| Right ascension | 16h 30m 29.6185s |
| Declination | +38° 20′ 50.308″ |
| Apparent magnitude (V) | 8.15 |
| Characteristics | |
| Spectral type | G0 IV |
| Apparent magnitude (B) | 8.76 |
| B−V color index | 0.611 |
| Astrometry | |
| Radial velocity (Rv) | −18.1 ± 0.4 km/s |
| Proper motion (μ) | RA: −77.900±0.075 mas/yr Dec.: 52.694±0.088 mas/yr |
| Parallax (π) | 13.04 ± 0.22 mas |
| Distance | 250 ± 4 ly (77 ± 1 pc) |
| Absolute magnitude (MV) | 3.65 ± 0.12 |
| Details | |
| Mass | 1.345 ± 0.020 M☉ |
| Radius | 1.541 +0.046 −0.042 R☉ |
| Luminosity | 3.03 +0.20 −0.18 L☉ |
| Surface gravity (log g) | 4.189 +0.020 −0.021 cgs |
| Temperature | 6,147 ± 50 K |
| Metallicity [Fe/H] | 0.36 ± 0.05 dex |
| Rotational velocity (v sin i) | 6.0 ± 0.5 km/s |
| Age | 2.6 +0.3 −0.2 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
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