HD 208487
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| Observation data Equinox 2000 |
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|---|---|
| Constellation | Grus |
| Right ascension | 21h 57m 19.85s |
| Declination | -37° 45' 49.04" |
| Apparent magnitude (V) | 7.48 |
| Distance | 144.4 ly (44.30 pc) |
| Spectral type | G2V: |
| Other designations | |
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CD-38°14804, HIP 108375
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HD 208487 is a 7th magnitude star in the constellation of Grus. Like our Sun, it is a yellow dwarf star. It has the same spectral type as our sun, G2 V. However, it is probably slightly less massive and more luminous, indicating that it is slightly older.
In 2004 a planet named HD 208487 b, found orbiting the star, was announced.
[edit] HD 208487 b
| Orbital elements | ||
|---|---|---|
| Semi-major axis a: | 0.52 AU | |
| Eccentricity e: | 0.38 | |
| Orbital period P: | 128.8 d | |
| Inclination i: | ?° | |
| Longitude of periastron ω: |
148° | |
| Time of periastron τ: | JD | |
| Physical characteristics | ||
| Mass: | >0.43 MJ | |
| Radius: | ? RJ | |
| Density: | ? kg/m³ | |
| Temperature: | ? K | |
| Discovery | ||
| Discovery date: | 2004 | |
| Detection method(s): | ||
| Discoverer(s): | Tinney, Butler, Marcy et al. |
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The planet, HD 208487 b, has a minimum mass close to half that of Jupiter and is most probably a gas giant. The planet orbits the star in a close, very eccentric orbit. One revolution takes 129 days to complete.
[edit] References
- Tinney et al. (2005). "Three Low-Mass Planets from the Anglo-Australian Planet Search". The Astrophysical Journal 623: 1171-1179.
[edit] External links
- SIMBAD entry
- The Extrasolar Planets Encyclopaedia entry
- Extrasolar Visions entry
- California & Carnegie Planet Search entry
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