HD 176051
HD 176051 is a spectroscopic binary star system approximately 49 light years away from Earth in the constellation Lyra. The pair orbit with a period of 22,423 days (61.4 years) and an eccentricity of 0.25. Compared to the Sun, they have a somewhat lower proportion of elements more massive than helium. Their individual masses are estimated at 1.07 and 0.71 solar masses (M☉). The system is moving closer to the Sun with a radial velocity of −47 km/s and will reach perihelion in about 269,000 years when it comes within roughly 17 ly (5.1 pc) of the Sun.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Lyra |
| Right ascension | 18h 57m 01.60985s |
| Declination | +32° 54′ 04.5723″ |
| Apparent magnitude (V) | 5.22 |
| Characteristics | |
| Spectral type | G0 V + K1 V |
| U−B color index | +0.029 |
| B−V color index | +0.570 |
| Astrometry | |
| Radial velocity (Rv) | −47.2 km/s |
| Proper motion (μ) | RA: +201.96 mas/yr Dec.: −145.46 mas/yr |
| Parallax (π) | 67.24 ± 0.37 mas |
| Distance | 48.5 ± 0.3 ly (14.87 ± 0.08 pc) |
| Absolute magnitude (MV) | 4.34 |
| Orbit | |
| Period (P) | 22,423 d |
| Semi-major axis (a) | 19.1 AU |
| Eccentricity (e) | 0.25 (0.27 or 0.54) |
| Argument of periastron (ω) (secondary) | 102° |
| Semi-amplitude (K1) (primary) | 3.51 km/s |
| Semi-amplitude (K2) (secondary) | 0.74 km/s |
| Details | |
| HD 176051 A | |
| Mass | 1.07 M☉ |
| Radius | 1.06 R☉ |
| Luminosity | 1.65 L☉ |
| Surface gravity (log g) | 4.60 cgs |
| Temperature | 6,000 K |
| Metallicity [Fe/H] | −0.11 dex |
| Age | 8.1 Gyr |
| HD 176051 B | |
| Mass | 0.71 M☉ |
| Radius | 0.81 R☉ |
| Other designations | |
| Database references | |
| SIMBAD | AB |
| A | |
| B | |
| Exoplanet Archive | data |
| ARICNS | data |
| data2 | |
| Extrasolar Planets Encyclopaedia | data |
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