HD 221287
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| Observation data Epoch J2000.0 |
|
|---|---|
| Constellation (pronunciation) |
Tucana |
| Right ascension | 23h 31m 20.339s |
| Declination | -58° 12′ 35.04″ |
| Apparent magnitude (V) | +7.82 |
| Absolute magnitude (V) | +4.20 |
| Distance | 172.5 ly (52.9 pc) |
| Spectral type | F7V |
| Other designations | |
|
HIP 116084
|
|
HD 221287 is a yellow-white main-sequence star 1.63 Em away from the Solar System in the constellation Tucana. It has an apparent magnitude of 8 and absolute magnitude of 4. This star is also named HIP 116084.
[edit] HD 221287 b
| Extrasolar planet | List of extrasolar planets | |
|---|---|---|
| Orbital elements | ||
| Semimajor axis | (a) | 1.25 ± 0.04 AU |
| Eccentricity | (e) | 0.08 ± 0.11 |
| Orbital period | (P) | 456.1 ± 6.5 d |
| Angular distance | (θ) | 23.629 mas |
| Longitude of periastron |
(ω) | 98 ± 72° |
| Time of periastron | (T0) | 2,453,263 ± 100 JD |
| Semi-amplitude | (K) | 71 ± 13 m/s |
| Physical characteristics | ||
| Mass | (m) | >3.12 ± 0.78 MJ |
| Discovery information | ||
| Discovery date | 2007 | |
| Discoverer(s) | Naef et al. | |
| Detection method | HARPS | |
| Discovery site | Chile | |
| Discovery status | Published | |
HD 221287 b is a 5.92 Wg exoplanet that orbits at 187 Gm or 6.06 μpc from the star, taking 39.41 Ms to orbit at 29.9 km/s around the star with 8% eccentricity. Naef discovered his planet in early 2007 by using HARPS spectrograph located in Chile.
[edit] References
- D. Naef, M. Mayor, W. Benz, F. Bouchy, G. Lo Curto, C. Lovis, C. Moutou, F. Pepe, D. Queloz, N. C. Santos, and S. Udry (2007). "[http://www.aanda.org/index.php?option=article&access=standard&Itemid=129&url=/articles/aa/abs/2007/29/aa7361-07/aa7361-07.html The HARPS search for southern extra-solar planets
IX. Exoplanets orbiting HD 100777 , HD 190647 , and HD 221287]". Astronomy & Astrophysics 470: 721-726.
[edit] External links
- Notes for star HD 221287
- Notes for planet HD 221287 b
- SIMBAD: HD 221287 SIMBAD Query result
- SIMBAD Query result planet
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