User:Kepler-1229b/alf cen bc

Alpha Centauri Bc
Discovery
Discovered by	Demory et al.
Discovery date	2013
Detection method	Transit
Orbital characteristics
Semi-major axis	0.10
Eccentricity	<0.24
Orbital period (sidereal)	12.4
Physical characteristics
Mean radius	0.92±0.06 R🜨
Mass	~1.01 ± 0.09 ME
Mean density	~7.163 g/cm³

Size comparison
Earth	Kepler-1229b/alf cen bc

Alpha Centauri Bc is a suspected exoplanet orbiting Alpha Centauri B, part of Alpha Centauri system, the closest system to our own. It is located about 4.4 light-years away and is not in the habitable zone. It was first announced in 2013,^{[citation needed]} and was the second proposed exoplanet in the system, after Alpha Centauri Bb. It would have an orbital period of approximately 12 Earth days, longer than that of Bb, now proven to not exist, and far smaller than that of Mercury.^[1]^[3]

References

^ ^a ^b ^c ^d ^e ^f ^g LePage, Andrew (March 28, 2015). "Has Another Planet Been Found Orbiting Alpha Centauri B?". Drew ex Machina. Retrieved September 5, 2015.
^ ^a ^b ^c ^d ^e ^f ^g Demory, Brice-Olivier; et al. (2015). "Hubble Space Telescope search for the transit of the Earth-mass exoplanet Alpha Centauri Bb". Monthly Notices of the Royal Astronomical Society. 450 (2): 2043. arXiv:1503.07528. Bibcode:2015MNRAS.450.2043D. doi:10.1093/mnras/stv673.{{cite journal}}: CS1 maint: unflagged free DOI (link)
^ Aron, Jacob (March 28, 2015). "Twin Earths may lurk in our nearest star system". New Scientist. Reed Business Information, Ltd. Retrieved September 5, 2015.