|Exoplanet||List of exoplanets|
|Right ascension||(α)||05h 11m 40.58s|
|Declination||(δ)||+45° 01′ 06.3″|
|Stellar flux||(F⊙)||0.4 ⊕|
|Discovery method||Radial Velocity|
|Discovery status||Published refereed article|
Kapteyn b; HIP 24186 b; 2MASS J05114046-4501051 b; TYC 8078-01749-1 b; IRAS 05100-4502 b; WISE J051146.81-450204.5 b; CPD-44 612 b; SAO 217223 b; GJ 191 b; VZ Pic b; Kapteyn's star b; LHS 29 b; HD 33793 b; CD-45 1841 b
|Open Exoplanet Catalogue||data|
Kapteyn b is a possible exoplanet that orbits the red dwarf Kapteyn's star, located approximately 12.8 light-years (3.92 pc) from Earth. Kapteyn b is within the estimated habitable zone of its star. It is the closest suspected habitable exoplanet to our solar system other than Tau Ceti e. However, later research has cast doubt on the existence of Kapteyn b, suggesting the signal is consistent with stellar activity rather than a planet.
The planet was first discovered by the HARPS spectrometer which is housed at the European Southern Observatory's La Silla Observatory in Chile. Further confirmations of the planetary detection where made at the Keck Observatory in Hawaii and at the PFS Observatory, also in Chile.
One other planet has been detected within the same planetary system. It is designated "Kapteyn c" and orbits further out from the star, beyond the outer edge of the habitable zone. It is considered to be too cold for stellar-light based life.
- Anglada-Escude, G.; et al. (8 July 2014). "Two planets around Kapteyn's star: a cold and a temperate super-Earth orbiting the nearest halo red dwarf". Oxford Journals. arXiv:1406.0818. Bibcode:2014MNRAS.443L..89A. doi:10.1093/mnrasl/slu076. Retrieved 10 January 2015.
- Wall, Mike (3 June 2014). "Found! Oldest Known Alien Planet That Might Support Life". Space.com. Retrieved 10 January 2015.
- Robertson, Paul (11 May 2015). "Stellar activity mimics a habitable-zone planet around Kapteyn's star". arxiv.org. Retrieved 13 May 2015.
- NASA – Kapteyn b at The NASA Exoplanet Archive.
- Kapteyn's b at The Extrasolar Planets Encyclopaedia from the Paris Observatory
- Kapteyn b in the Habitable Exolanets Catalog at UPR-Arecibo.