| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Lyra |
| Right ascension | 18h57m 01.60985s[1] |
| Declination | +32° 54′ 04.5723″[1] |
| Apparent magnitude (V) | 5.22 |
| Characteristics | |
| Spectral type | G0 V + K1 V[2] |
| U−B color index | +0.029[3] |
| B−V color index | +0.570[3] |
| Astrometry | |
| Radial velocity (Rv) | −47.2[4] km/s |
| Proper motion (μ) | RA: +201.96[1] mas/yr Dec.: −145.46[1] mas/yr |
| Parallax (π) | 67.24 ± 0.37 mas[1] |
| Distance | 48.5 ± 0.3 ly (14.87 ± 0.08 pc) |
| Absolute magnitude (MV) | 4.34[5] |
| Orbit[6] | |
| Period (P) | 22,423 d |
| Semi-major axis (a) | 19.1 AU[7] |
| Eccentricity (e) | 0.25 (0.27[7] or 0.54[8]) |
| 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[2] M☉ |
| Radius | 1.06[9] R☉ |
| Luminosity | 1.65[5] L☉ |
| Surface gravity (log g) | 4.60[10] cgs |
| Temperature | 6,000[10] K |
| Metallicity [Fe/H] | −0.11[10] dex |
| Age | 8.1[11] Gyr |
| HD 176051 B | |
| Mass | 0.71[2] M☉ |
| Radius | 0.81[9] R☉ |
| Other designations | |
ADS 11871, HR 7162, BD+32°3267, GJ 738, HD 176051, LTT 15567, SAO 67612, HIP 93017.[12] | |
| Database references | |
| SIMBAD | AB |
| A | |
| B | |
| Exoplanet Archive | data |
| ARICNS | data |
| data2 | |
| Extrasolar Planets Encyclopaedia | data |
HD 176051 is a spectroscopic binary star system[12] 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.[6] Compared to the Sun, they have a somewhat lower proportion of elements more massive than helium.[10] Their individual masses are estimated at 1.07 and 0.71 solar masses (M☉).[2] The system is moving closer to the Sun with a radial velocity of −47[4] km/s and will reach perihelion in about 269,000 years when it comes within roughly 17 ly (5.1 pc) of the Sun.[13]
A planet orbiting one of the stars was discovered through astrometric observations. However, it is not known which stellar component the planet is orbiting around.
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 1.5 ± 0.3 MJ | 1.76 | 1016 ± 40 | 0 | — | — |
The planet parameters are given here for the 0.71 M☉ component B.[7] But, if instead the planet is orbiting the 1.07 M☉ component A, its mass is 2.26 MJ with a semimajor axis of 2.02 AU.[14]
The substellar object is a planet 1.5 ± 0.3 times the mass of Jupiter, assuming a distance of 15 pc and a stellar mass of 0.71 M☉...
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