HD 30177
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| Observation data Epoch J2000.0 |
|
|---|---|
| Constellation (pronunciation) |
Dorado |
| Right ascension | 04h 41m 54.3731s |
| Declination | -58º 01' 14.725″ |
| Apparent magnitude (V) | 8.41 |
| Absolute magnitude (V) | 4.72 |
| Distance | 178.4 ly (54.7 pc) |
| Spectral type | G8V |
| Other designations | |
HD 30177 is an 8th magnitude star in the constellation Dorado. The star is a yellow dwarf, a type of yellow star that fuses hydrogen in its core. Since if this star is a late G-type, it is cooler and less massive than the Sun, but larger in radius. It is 1.8 times older than our Sun. This star is located 178 light years (55 parsecs) away from the solar system. This star is at the center of the single planetary system.
Contents |
[edit] HD 30177 b
| Orbital elements | ||
|---|---|---|
| Semi-major axis a: | 3.95±0.05 AU | |
| Eccentricity e: | 0.193±0.025 | |
| Orbital period P: | 2770±100 d | |
| Inclination i: | ?° | |
| Angular distance θ: | 72.212 mas | |
| Longitude of periastron ω: |
34±15° | |
| Time of periastron τ: | 2451437±72 JD | |
| Semi-amplitude K: | 146.8±2.8 m/s | |
| Physical characteristics | ||
| Mass: | >10.52±0.20 MJ | |
| Radius: | Estimated 1.05 RJ | |
| Density: | ? kg/m³ | |
| Gravity: | ? g | |
| Temperature: | ? K | |
| Discovery | ||
| Discovery date: | June 2002 | |
| Discovery site: | ||
| Detection method(s): | radial velocity | |
| Discoverer(s): | Tinney, Butler, Marcy et al. | |
| Other catalogue | ||
HD 30177 b is one of the most massive planets ever detected by radial velocity method. It is even more massive than Pi Mensae b, but not as massive as HD 114762 b and HD 136118 b. This planet by mass is classified as massive superjovian. In addition, the planet orbits far from the star, about 4 AU away, taking 2770 days (7.58 years) to orbit the star. Even if the massive planet is orbiting at 4 AU from the star, semi-amplitude is high, around 146.8±2.8 m/s. Since if inclination is not known, this planet would likely be a brown dwarf instead.
[edit] References
- Tinney et al. (2003). "Four New Planets Orbiting Metal-enriched Stars". The Astrophysical Journal 587 (1): 423 – 428. doi:.
- Butler et al. (2006). "Catalog of Nearby Exoplanets". The Astrophysical Journal 646 (1): 505 – 522. doi:. (web Preprint)
[edit] See also
[edit] External links
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