| Discovery | |
|---|---|
| Discovered by | Dominique Naef et al.[1] |
| Discovery site |  Chile |
| Discovery date | March 5, 2007 |
| HARPS | |
| Orbital characteristics | |
| Apastron | 1.35 AU (202,000,000 km) |
| Periastron | 1.15 AU (172,000,000 km) |
| 1.25 ± 0.04 AU (187,000,000 ± 6,000,000 km) | |
| Eccentricity | 0.08 ± 0.11 |
| 456.1 ± 6.5 d 1.2487 y | |
| 2,453,263 ± 100 | |
| 98 ± 72 | |
| Semi-amplitude | 71 ± 13 |
| Star | HD 221287 |
| Physical characteristics | |
| Mass | >3.12 ± 0.78 MJ (992 ME) |
HD 221287 b, also known as Pipitea, is an exoplanet that orbits HD 221287, 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. Dominique 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.
It was named "Pipitea" by representatives of the Cook Islands in the IAU's 2019 NameExoWorlds contest, with the comment "Pipitea is a small, white and gold pearl found in Penrhyn lagoon in the northern group of the Cook Islands."[4]
- ^ a b Cite error: The named reference
Naef2007was invoked but never defined (see the help page). - ^ 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". Archived from the original on 2017-12-01. Retrieved 2013-06-23.
- ^ "Approved names (§ Cook Islands)". Name Exo Worlds. IAU. Retrieved 19 December 2019.