HD 168746
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| Observation data Epoch 2000 |
|
|---|---|
| Constellation (pronunciation) |
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 | |
|
BD-11°4606, HIP 90004
|
|
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: | ?° | |
| Angular distance θ: | 2 mas | |
| Longitude of periastron ω: |
16.30 ± 20.88° | |
| Time of periastron τ: | 2,451,994.7 ± 0.4 JD | |
| Semi-amplitude K: | 28.6 ± 1.7 m/s | |
| Physical characteristics | ||
| Mass: | >0.23 MJ | |
| Radius: | ? RJ | |
| Density: | ? kg/m³ | |
| Gravity: | ? g | |
| Temperature: | ? K | |
| Discovery | ||
| Discovery date: | 2000 | |
| Discovery site: | ||
| Detection method(s): | CORALIE | |
| Discoverer(s): | Pepe, Mayor, Galland et al. |
|
| Other catalogue | ||
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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