HD 187123
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cygnus |
| Right ascension | 19h 46m 58.1122s |
| Declination | +34° 25′ 10.281″ |
| Apparent magnitude (V) | 7.83 |
| Characteristics | |
| Spectral type | G2V |
| B−V color index | 0.661±0.010 |
| Astrometry | |
| Radial velocity (Rv) | −16.91(12) km/s |
| Proper motion (μ) | RA: 142.591(15) mas/yr Dec.: −123.715(18) mas/yr |
| Parallax (π) | 21.7166±0.0157 mas |
| Distance | 150.2 ± 0.1 ly (46.05 ± 0.03 pc) |
| Absolute magnitude (MV) | 4.41 |
| Details | |
| Mass | 1.06±0.02 M☉ |
| Radius | 1.17±0.03 R☉ |
| Luminosity | 1.44±0.02 L☉ |
| Surface gravity (log g) | 4.32±0.03 cgs |
| Temperature | 5,853±53 K |
| Metallicity [Fe/H] | 0.121±0.030 dex |
| Rotational velocity (v sin i) | 2.15±0.50 km/s |
| Age | 5.6±1.3 Gyr |
| Other designations | |
| BD+34°3708, HD 187123, HIP 97336, SAO 68845, LTT 15779 | |
| Database references | |
| SIMBAD | data |
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HD 187123 is a single, yellow-hued star with two exoplanetary companions in the northern constellation of Cygnus. It has an apparent visual magnitude of 7.83, making it an 8th magnitude star that is too faint to be visible with the naked eye. However, it should be easy target with binoculars or small telescope. The system is located at a distance of 150 light years from the Sun based on parallax measurements, but is drifting closer with a radial velocity of −17 km/s.