14 Herculis
|
14 Herculis |
|
| Observation data Epoch J2000.0 Equinox J2000.0 |
|
|---|---|
| Constellation | Hercules |
| Right ascension | 16h 10m 24.31s[1] |
| Declination | +43° 49′ 03.5″[1] |
| Apparent magnitude (V) | +6.67 |
| Characteristics | |
| Spectral type | K0V |
| U−B color index | 0.67 |
| B−V color index | 0.88 |
| Variable type | None |
| Astrometry | |
| Radial velocity (Rv) | −5.5 km/s |
| Proper motion (μ) | RA: 131.83 ± 0.32[1] mas/yr Dec.: -297.54 ± 0.36[1] mas/yr |
| Parallax (π) | 56.91 ± 0.34[1] mas |
| Distance | 57.3 ± 0.3 ly (17.6 ± 0.1 pc) |
| Absolute magnitude (MV) | +5.38 |
| Details | |
| Mass | 0.9[2] M☉ |
| Radius | 0.708 ± 0.085[3] R☉ |
| Luminosity | 0.36[note 1] L☉ |
| Surface gravity (log g) | 4.315 cgs |
| Temperature | 5,311 ± 87[2] K |
| Metallicity | 0.43 ± 0.08[2] [Fe/H] |
| Age | 3.9 × 109 years |
| Other designations | |
| Database references | |
| SIMBAD | data |
14 Herculis or 14 Her is the Flamsteed designation of a K-type main-sequence star approximately 57 light-years away in the constellation Hercules. Because of its apparent magnitude, the star cannot be seen with the naked eye. As of 2006, it is thought that 14 Herculis has two extrasolar planets in orbit around the star.
Stellar components
14 Herculis is an orange dwarf star of the spectral type "K0V." It is thought that the star has 90 percent of the mass, 71 percent of the radius, and only 36 percent of the luminosity of the Sun. The star appears to be 2.7 times as enriched with elements heavier than hydrogen (based on its abundance of iron), in comparison to the Sun.
Planetary system
In 1998 a planet was discovered orbiting 14 Herculis.[4] The planet's eccentric orbital period is 4.8 years.[2] In 2005, a possible second planet was proposed, designated 14 Herculis c.[5] The parameters of this planet are uncertain, but a recent analysis suggests it may lie in the 4:1 resonance with the inner planet, with an orbital period of almost 19 years at an orbital distance of 6.9 AU.[2]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥4.64 ± 0.19 MJ | 2.77 ± 0.05 | 1773.4 ± 2.5 | 0.369 ± 0.005 | — | — |
| c | ≥2.1 MJ | 6.9 | 6906 ± 70 | 0 (fixed) | — | — |
See also
Notes
- ↑ From L=4πR2σTeff4, where L is the luminosity, R is the radius, Teff is the effective surface temperature and σ is the Stefan–Boltzmann constant.
References
- ↑ 1.0 1.1 1.2 1.3 1.4 Lua error in package.lua at line 80: module 'strict' not found. Vizier catalog entry
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
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External links
- Lua error in package.lua at line 80: module 'strict' not found.
- Lua error in package.lua at line 80: module 'strict' not found.
- Lua error in package.lua at line 80: module 'strict' not found.
