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(Redirected from 14 Her)
 14 Herculis |
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| Observation data Epoch J2000.0 Equinox J2000.0 |
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|---|---|
| Constellation | Hercules |
| Right ascension | 16h 10m 23.59s |
| Declination | +43° 49′ 18.2″ |
| 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: 132.52 mas/yr Dec.: −298.38 mas/yr |
| Parallax (π) | 55.11 ± .59 mas |
| Distance | 59 ly (18.1 pc) |
| Absolute magnitude (MV) | +5.38 |
| Details | |
| Mass | 0.79 M☉ |
| Radius | 0.88 R☉ |
| Surface gravity (log g) | 4.315 |
| Luminosity | 0.75 L☉ |
| Temperature | 5250 K |
| Metallicity | 0.35 [Fe/H] |
| Age | 3.9 × 109 years |
| Other designations | |
| Database references | |
| SIMBAD | data |
14 Herculis or 14 Her is an orange dwarf star approximately 59 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.
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[edit] Stellar components
14 Herculis is an orange dwarf star of the spectral type "K0V." It is though that the star has only 79 percent the mass of the Sun, 88 percent of the radius, and 75 percent of the luminosity. The star appears to be 3.2 times as enriched with elements heavier than hydrogen (based on its abundance of iron).
[edit] Planetary system
In 1998 an extrasolar planet was discovered to orbit 14 Herculis, which received the designation 14 Herculis b.[1] The planet is located in an eccentric, long-period orbit which takes around 4.8 years to complete.[2] In 2005, a possible second planet was proposed, designated 14 Herculis c.[3] 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 |
|---|---|---|---|---|
| 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) |
[edit] See also
[edit] References
- ^ Mayor, M. et al. (1998). "Searching for giant planets at the Haute-Provence Observatory". In (ed. Hearnshaw, J. B. and Scarfe, C. D.). Precise Stellar Radial Velocities. IAU Colloqu. 170. San Francisco: ASP.
- ^ a b c Wittenmyer, R. A., Endl, M., Cochran, W. D. (2007). "Long-Period Objects in the Extrasolar Planetary Systems 47 Ursae Majoris and 14 Herculis". The Astrophysical Journal 654 (1): 625–632. arXiv:astro-ph/0609117. Bibcode 2007ApJ...654..625W. doi:10.1086/509110.
- ^ Goździewski, K., Konacki, M., Maciejewski, A. J. (2006). "Orbital Configurations and Dynamical Stability of Multiplanet Systems around Sun-like Stars HD 202206, 14 Herculis, HD 37124, and HD 108874". The Astrophysical Journal 645 (1): 688–703. arXiv:astro-ph/0511463. Bibcode 2006ApJ...645..688G. doi:10.1086/504030.
[edit] External links
- "14 Herculis". Extrasolar Visions. http://www.extrasolar.net/startour.asp?StarCatId=normal&StarId=8. Retrieved 2008-06-25.
- "14 Herculis". SolStation. http://www.solstation.com/stars2/14her.htm. Retrieved 2008-06-25.
- "New Worlds Atlas". Jet Propulsion Laboratory. Planet Quest. http://planetquest1.jpl.nasa.gov/atlas/atlas_search.cfm. Retrieved 2008-06-25.
- Jean Schneider (2011). "Notes for star 14 Her". The Extrasolar Planets Encyclopaedia. http://exoplanet.eu/star.php?st=14+Her. Retrieved 2011-10-30.
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