HD 154345
| Observation data Epoch J2000.0 Equinox J2000.0 |
|
|---|---|
| Constellation | Hercules |
| Right ascension | 17h 02m 36.404s[1] |
| Declination | +47° 04′ 54.76″[1] |
| Apparent magnitude (V) | +6.74 |
| Characteristics | |
| Spectral type | G8V |
| U−B color index | 0.27 |
| B−V color index | 0.73 |
| Variable type | none |
| Astrometry | |
| Radial velocity (Rv) | -46.2 km/s |
| Proper motion (μ) | RA: 123.27 ± 0.35[1] mas/yr Dec.: 853.63 ± 0.36[1] mas/yr |
| Parallax (π) | 53.80 ± 0.32[1] mas |
| Distance | 60.6 ± 0.4 ly (18.6 ± 0.1 pc) |
| Absolute magnitude (MV) | +5.46 |
| Details | |
| Mass | 0.88 M☉ |
| Luminosity | 0.568 L☉ |
| Temperature | 5468 ± 44 K |
| Metallicity | -0.105 ± 0.03 |
| Rotation | 27.8 ± 1.7 days[2] |
| Age | 4.92 ± 4.48 × 109 years |
| Other designations | |
|
HD 154345, BD+47º2420, GC 23011, GCRV 9834, Gliese 651, Gl 651, GJ 651, HIP 83389, SAO 46452
|
|
HD 154345 (Gliese 651) is a G-type dwarf star located in northern Hercules. It is not visible to the naked eye since it is below +6.50 magnitude, but using binoculars it is an easy target.
Planetary system
In 2006, a long-period, wide-orbiting planet was observed by radial velocity, and published in May 2007, gaining the designation HD 154345 b.[3]
The complete observation of its nine-year orbit rules out any interior planets of minimum mass (m sini) greater than 0.3 Jupiter.[4] The star rotates at an inclination of 50+40
−26 degrees relative to Earth.[2] It is probable that the planet shares that inclination.[5][6] It has been called a "Jupiter twin".[4]
The system's habitable zone is centered at .754 AU and is narrower than the Sun's.[7]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (years) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 1.2+1.3 −0.4[2] MJ |
4.19 ± 0.26 | 9.15 ± 0.26 | 0.044 ± 0.046 | — | — |
References
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Coordinates: 
17h 02m 36.40s, +47° 04′ 54.77″
- ↑ 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 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 4.0 4.1 4.2 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.
- ↑ Square root of stellar luminosity.
