| Observation data EpochJ2000 EquinoxJ2000 | |
|---|---|
| Constellation | Lyra |
| Right ascension | 19h 14m 50.209s[1] |
| Declination | +31° 51′ 37.26″[1] |
| Apparent magnitude (V) | 6.61[2] |
| Characteristics | |
| Evolutionary stage | giant[2] |
| Spectral type | K0 III[2] |
| B−Vcolor index | +1.000[2] |
| Astrometry | |
| Radial velocity (Rv) | −73.87±0.20[3] km/s |
| Proper motion (μ) | RA: 46.844mas/yr[1] Dec.: 20.444mas/yr[1] |
| Parallax (π) | 8.1261±0.0192 mas[1] |
| Distance | 401.4 ± 0.9 ly (123.1 ± 0.3 pc) |
| Absolute magnitude (MV) | 0.931[2] |
| Details[3] | |
| Mass | 2.48±0.08 M☉ |
| Radius | 8.10±0.45 R☉ |
| Luminosity | 43.7 L☉ |
| Surface gravity (log g) | 3.06±0.10 cgs |
| Temperature | 4,997±30 K |
| Metallicity [Fe/H] | 0.22±0.04 dex |
| Age | 0.60±0.05 Gyr |
| Other designations | |
| BD+31° 3514,HD 180314,HIP 94576,SAO 68027[4] | |
| Database references | |
| SIMBAD | data |
HD 180314 is astar with an orbitingsubstellar companion in the northernconstellation ofLyra. It is near the lower limit of visibility to the naked eye with anapparent visual magnitude of 6.61.[2] The distance to this system is 401 light years based onparallax measurements, but it is drifting closer with a heliocentricradial velocity of −73.9 km/s.[3] With high probability it is a member of theHercules stream of co-moving stars.[5]
This is anevolvedgiant star of theK-type with astellar classification of K0 III.[2] At the age of roughly 600 million years, it has exhausted the supply of hydrogen at itscore and expanded away from themain sequence. It has 2.48 times themass of the Sun and 8.10 times theSun's radius. The star is radiating 44 times the luminosity of the Sun from its enlargedphotosphere at aneffective temperature of 4,997 K.[3]
The star is orbited by one substellar companion,HD 180314 b,[4] an object with a minimum mass 22 times that ofJupiter and hence likely to be abrown dwarf.[2] It orbits HD 180314 every 396 days with asemi-major axis of 1.4AU. HD 180314 b's orbit is moderately eccentric, with anorbital eccentricity of 0.257.[6]
| Companion (in order from star) | Mass | Semimajor axis (AU) | Orbital period (days) | Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | >22 MJ | 1.4 | 396.03 ± 0.62 | 0.257 ± 0.010 | — | — |