HD 221287 b
| Extrasolar planet | List of extrasolar planets | |
|---|---|---|
| Parent star | ||
| Star | HD 221287 | |
| Constellation | Tucana | |
| Right ascension | (α) | 23h 31m 20.3389s |
| Declination | (δ) | –58° 12′ 35.038″ |
| Distance | 172.502 ly (52.889 pc) | |
| Spectral type | F7V | |
| Orbital elements | ||
| Semimajor axis | (a) | 1.25 ± 0.04 AU |
| Periastron | (q) | 1.15 AU |
| Apastron | (Q) | 1.35 AU |
| Eccentricity | (e) | 0.08 ± 0.11 |
| Orbital period | (P) | 456.1 ± 6.5 d (1.2487 y) |
| Argument 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 (992 M⊕) |
| Discovery information | ||
| Discovery date | March 5, 2007 | |
| Discoverer(s) | Naef et al.[1] | |
| Discovery method | HARPS | |
| Discovery site |  Chile | |
| Discovery status | Published[1] | |
HD 221287 b is an exoplanet approximately 173 light years away in the constellation of Tucana. This planet has mass >3.12 MJ (>992 M⊕) and orbits in a habitable zone at 1.25 AUs (6.06 μpc) from the star, taking 1.25 years to orbit at 29.9 km/s around the star. Naef discovered this planet in early 2007 by using HARPS spectrograph located in Chile.[1]
Based on a probable 10−4 fraction of the planet mass as a satellite,[2] the planet can have a Mars-sized moon with habitable surface.[3] On the other hand, this mass can be distributed into many small satellites as well.
See also
References
- ↑ 1.0 1.1 1.2 Naef, M. et al. (2007). "The HARPS search for southern extra-solar planets IX. Exoplanets orbiting HD 100777 , HD 190647 , and HD 221287". Astronomy and Astrophysics 470 (2): 721–726. arXiv:0704.0917. Bibcode:2007A&A...470..721N. doi:10.1051/0004-6361:20077361.
- ↑ Canup R.M., Ward W.R. (2006). A common mass scaling for satellite systems of gaseous planets. Nature, 441: 834-839.
- ↑ The Habitable Exoplanets Catalog: Data of Potential Habitable Worlds
External links
- "Notes for planet HD 221287 b". The Extrasolar Planets Encyclopaedia. Retrieved 2008-07-21.
Coordinates: 
23h 31m 20.3389s, −58° 12′ 35.038″