14 Herculis
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| Observation data 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 | ? |
| B-V color index | ? |
| 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) | ? |
| Details | |
| Mass | 1 M☉ |
| Radius | 1.05 R☉ |
| Luminosity | ? L☉ |
| Temperature | 5250 K |
| Metallicity | 0.35 [Fe/H] |
| Rotation | ? |
| Age | 3900 million years |
| Other designations | |
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HD 145675, HIP 79248, Gl 614
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14 Herculis is an orange dwarf star approximately 59 light-years away in the constellation Hercules. It cannot be seen with the naked eye.
As of 1998 an extrasolar planet was confirmed to orbit 14 Herculis. As of 2005, a possible second planet was proposed. In 2006 the Systemic project proposed orbital solutions of three planets. While there are multiple data sets to analyze the system, all the best fits use a three planet system - two large planets, larger than Jupiter, and also one small planet, 2 - 4 % of Jupiter, so a bit bigger than the Earth in a tight orbit or about 13 - 20 days long (at a distance of 0.1 to 0.15 AU.)
14 Herculis is also known as Gliese 614[1] [2]
Contents |
[edit] Planets
[edit] 14 Herculis b
| Extrasolar planet | Lists of extrasolar planets | |
|---|---|---|
| Orbital elements | ||
| Semimajor axis | (a) | 2.80 AU |
| Eccentricity | (e) | 0.338 ± 0.011 |
| Orbital period | (P) | 1796.4 ± 8.3 d (4.9 y) |
| Inclination | (i) | ?° |
| Longitude of periastron |
(ω) | 22.58 ± 1.98° |
| Time of periastron | (τ) | 2,49582.0 ± 12.4 JD |
| Physical characteristics | ||
| Mass | (m) | >4.74 ± 0.06 MJ |
| Radius | (r) | ~1.043 RJ |
| Density | (ρ) | ? kg/m3 |
| Temperature | (T) | ~139 K |
| Discovery information | ||
| Discovery date | 1998 | |
| Discoverer(s) | Naef et al. | |
| Detection method | Doppler Spectroscopy | |
| Discovery status | Published | |
14 Herculis b is an extrasolar planet orbiting 14 Herculis. Based on its mass, it is most likely a gas giant. It was discovered in 1998 by the Geneva Extrasolar Planet Search team and at the time of discovery was the extrasolar planet with the longest orbital period, though longer-period planets have subsequently been discovered.
[edit] 14 Herculis c
| Extrasolar planet | Lists of extrasolar planets | |
|---|---|---|
| Orbital elements | ||
| Semimajor axis | (a) | 5.81 AU |
| Eccentricity | (e) | 0.004 |
| Orbital period | (P) | ? d |
| Inclination | (i) | ?° |
| Longitude of periastron |
(ω) | 197.17° |
| Time of periastron | (τ) | ? JD |
| Physical characteristics | ||
| Mass | (m) | >2.086 MJ |
| Radius | (r) | ? RJ |
| Density | (ρ) | ? kg/m3 |
| Temperature | (T) | ? K |
| Discovery information | ||
| Discovery date | 2005 (TBC) | |
| Discoverer(s) | Goździewski et al. | |
| Detection method | Doppler Spectroscopy | |
| Discovery status | Published | |
14 Herculis c is an unconfirmed extrasolar planet around 14 Herculis. If it exists, it is likely to be a gas giant. The discovery was announced on November 17, 2005 . The planet's parameters are not precisely known and a second possible solution exists, with a minimum mass of 6.289 times that of Jupiter, an eccentricity of 0.1 and a semimajor axis of 8.911 AU.
[edit] See also
[edit] References
- D. Naef, M. Mayor, J.L. Beuzit, C. Perrier, D. Queloz, J.P. Sivan, S. Udry (2004). "The ELODIE survey for northern extra-solar planets. III: Three planetary candidates detected with ELODIE.". Astronomy & Astrophysics 414: 351 – 359.
- K. Goździewski, M. Konacki, A.J. Maciejewski (2005). "Orbital configurations and dynamical stability of multi-planet systems around Sun-like stars HD 202206, 14 Her, HD 37124 and HD 108874". (preprint)
- Butler et al. (2003). "Seven New Keck Planets Orbiting G and K Dwarfs". The Astrophysical Journal 582: 455-466.
[edit] External links
- HD 145675. SIMBAD. Retrieved on 14 April, 2006.
- Notes for star 14 Her. The Extrasolar Planets Encyclopaedia. Retrieved on 14 April, 2006.
- New Worlds Atlas. Retrieved on 14 April, 2006.
