HD 47186 b is a “hot Neptune” extrasolar planet located approximately 123 light years away in the constellation of Canis Major, orbiting the star HD 47186. This planet has a minimum mass of 22.78 times that of Earth and orbits very close to the star at a similar distance from the star as 51 Pegasi b is from 51 Pegasi. As in consequence, it takes 4.0845 days to complete an orbit with an eccentricity of 0.038, which is similar to the 5.66 year-period planet HD 70642 b.

HD 47186 b

Discovery
Discovered by	Bouchy et al.
Discovery site	La Silla Observatory
Discovery date	June 16, 2008
Detection method	Doppler spectroscopy
Orbital characteristics
Apastron	0.052 AU (7,800,000 km)
Periastron	0.048 AU (7,200,000 km)
Semi-major axis	0.050 AU (7,500,000 km)
Eccentricity	0.038 ± 0.02
Orbital period (sidereal)	4.0845 ± 0.0002 d
Average orbital speed	130
Time of periastron	2,454,562.77 ± 0.08
Star	HD 47186