HD 221287 b

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.
Based on a probable 10−4 fraction of the planet mass as a satellite,Canup R.M., Ward W.R. (2006). A common mass scaling for satellite systems of gaseous planets. Nature, 441: 834-839. the planet can have a Mars-sized moon with habitable surface.The Habitable Exoplanets Catalog: Data of Potential Habitable Worlds On the other hand, this mass can be distributed into many small satellites as well.
== See also ==
* HD 100777 b
* HD 190647 b
== References ==
== External links ==
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Category:Exoplanets
Category:Gas giants
Category:Tucana (constellation)
Category:Exoplanets discovered in 2007
Category:Exoplanets detected by radial velocity
es:HD 221287#Sistema planetario