HD 108147
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| Observation data Epoch 2000 |
|
|---|---|
| Constellation (pronunciation) |
Crux |
| Right ascension | 12h 25m 46.27s |
| Declination | -64° 01' 19.52" |
| Apparent magnitude (V) | 7.003 |
| Distance | 125.7 ly (38.57 pc) |
| Spectral type | F8/G0V |
| Other designations | |
HD 108147 is a 7th magnitude star in the constellation of Crux. It is either a yellow-white or yellow dwarf (the line is arbitrary and the colour difference is only from classification, not real), slightly brighter and more massive than our Sun. The spectral type is F8 V or G0 V. The star is also younger than the Sun. Due to its distance, about 130 light years, it is too dim to be visible with unaided eye; with binoculars it is an easy target. However, due to its southerly location it is not visible in the northern hemisphere except for the tropics.
The star is special since an extrasolar planet has been detected orbiting it in 2000. It should not be confused with HD 107148, which also has an extrasolar planet discovered in 2006 in Virgo constellation.
Contents |
[edit] HD 108147 b
| Orbital elements | ||
|---|---|---|
| Semi-major axis a: | 0.104 AU | |
| Eccentricity e: | 0.498 ± 0.025 | |
| Orbital period P: | 10.901 ± 0.001 d | |
| Inclination i: | ?° | |
| Angular distance θ: | 2.696 mas | |
| Longitude of periastron ω: |
318 ± 3.03° | |
| Time of periastron τ: | 2,451,591.6 ± 0.1 JD | |
| Semi-amplitude K: | 25.1 ± 6.1 m/s | |
| Physical characteristics | ||
| Mass: | >0.40 MJ | |
| Radius: | ? RJ | |
| Density: | ? kg/m³ | |
| Gravity: | ? g | |
| Temperature: | 920 K | |
| Discovery | ||
| Discovery date: | 2000 | |
| Discovery site: | ||
| Detection method(s): | ||
| Discoverer(s): | Pepe, Mayor, Galland et al. |
|
| Other catalogue | ||
The planet, HD 108147 b is a gas giant with a minimum mass about half that of Jupiter. It orbits the star in a very tight "torch orbit". The distance between the planet and the star is only a tenth of the distance between Earth and the Sun (0.1AU). A number of such worlds are known to exist, but the eccentricity of this planet is unusually high. Planets orbiting very close to their parent stars usually have round orbits because of the tidal forces between the bodies.
[edit] See also
[edit] References
- Pepe et al. (2002). "The CORALIE survey for southern extra-solar planets VII Two short-period Saturnian companions to HD 108147 and HD 168746". Astronomy and Astrophysics 388: 632-638.
[edit] External links
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