HD 168746
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| Observation data Epoch 2000 |
|
|---|---|
| Constellation | Serpens |
| Right ascension | 18h 21m 49.78s |
| Declination | -11° 55' 21.66" |
| Apparent magnitude (V) | 7.95 |
| Distance | 140.6 ly (43.12 pc) |
| Spectral type | G5 |
| Other designations | |
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BD-11°4606, HIP 90004
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HD 168746 is an 8th magnitude star in the constellation of Serpens. It is very similar to our Sun, a yellow dwarf star (spectral class G5 V). It is not visible to the unaided eye, but is easily visible with binoculars or a small telescope. In 2000 a planet was announced orbiting it.
[edit] HD 168746 b
| Orbital elements | ||
|---|---|---|
| Semi-major axis | (a) | 0.065 AU |
| Eccentricity | (e) | 0.081 ± 0.029 |
| Orbital period | (P) | 6.403 ± 0.001 d |
| Inclination | (i) | ?° |
| Longitude of periastron |
(ω) | 16.30 ± 20.88° |
| Time of periastron | (τ) | 2,451,994.7 ± 0.4 JD |
| Physical characteristics | ||
| Mass | >0.23 MJ | |
| Radius | ? RJ | |
| Density | ? kg/m³ | |
| Temperature | ? K | |
| Discovery | ||
| Discovery date | 2000 | |
| Detection method(s) | ||
| Discoverer(s) | Pepe, Mayor, Galland et al. |
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HD 168746 b is an extrasolar planet orbiting the star. It has a minimum mass about one fourth that of Jupiter, so it is most likely a low mass gas giant. It orbits very near the star in a so-called "torch orbit" completing one revolution in only about six and half days.
[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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