HD 216770
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| Observation data Epoch 2000 |
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|---|---|
| Constellation (pronunciation) |
Piscis Austrinus |
| Right ascension | 22h 55m 53.70s |
| Declination | -26° 39' 31.55" |
| Apparent magnitude (V) | 8.10 |
| Distance | 123.5 ly (37.89 pc) |
| Spectral type | K1V |
| Other designations | |
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CD-27°16109, HIP 113238
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HD 216770 is an 8th magnitude star located in the constellation of Piscis Austrinus. It is an orange dwarf (spectral type K1 V), and is somewhat dimmer and cooler than our Sun.
In 2003 a planet was announced orbiting it by the Geneva Extrasolar Planet Search Team.
[edit] HD 216770 b
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Discovery
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|---|---|
| Discovered by | Mayor et al. |
| Discovery date | 2003 |
| Detection method | Radial velocity |
| Semi-major axis | 0.46 AU |
| Eccentricity | 0.37 ± 0.06 |
| Orbital period | 118.45 ± 0.55 d |
| Angular distance | 12 mas |
| Longitude of periastron | 281° ± 10° |
| Time of periastron | 2,452,672 ± 3.5 JD |
| Semi-amplitude | 30.9 ± 1.9 m/s |
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Physical characteristics
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| Mass | >0.65 MJ |
HD 216770 b is an extrasolar planet orbiting the star HD 216770. It has a mass about two thirds that of Jupiter, largest planet in our Solar system. But unlike the gas giants in the Solar system, it orbits in a very eccentric orbit around the star. The mean distance from the star is slightly larger than Mercury's, and it completes one orbit around the star in every 118 days.
[edit] References
- Mayor et al. (2004). "The CORALIE survey for southern extra-solar planets XII. Orbital solutions for 16 extra-solar planets discovered with CORALIE" (abstract). Astronomy and Astrophysics 415: 391–402. doi:. (web Preprint)
[edit] External links
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