HD 46375 b

HD 46375 b

Exoplanet		List of exoplanets
Parent star
Star		HD 46375
Constellation		Monoceros
Right ascension	(α)	06h 33m 12.6237s
Declination	(δ)	+05° 27′ 46.532″
Distance		108.9 ly (33.41 pc)
Spectral type		K1IV
Orbital elements
Semi-major axis	(a)	0.0398±0.0023 AU
Periastron	(q)	0.0373 AU
Apastron	(Q)	0.0423 AU
Eccentricity	(e)	0.063±0.026
Orbital period	(P)	3.023573±0.000065 d (0.008277947 y)
Orbital speed	(υ)	144 km/s
Argument of periastron	(ω)	114±24°
Time of periastron	(T0)	2,451,071.53±0.19 JD
Semi-amplitude	(K)	33.65±0.74 m/s
Physical characteristics
Minimum mass	(m sin i)	0.226±0.019 MJ
Discovery information
Discovery date		March 29, 2000
Discoverer(s)		Marcy, Butler, Vogt et al.
Discovery method		Radial velocity
Discovery site		California, USA
Discovery status		Published

HD 46375 b is an extrasolar planet located approximately 109 light-years away in the constellation of Monoceros, orbiting the star HD 46375. With 79 Ceti b on March 29, 2000, it was joint first known extrasolar planet less massive than Saturn orbiting a normal star. The planet is a "hot Jupiter", a type of planet that orbits very close to its parent star. In this case the orbital distance is only a tenth that of the planet Mercury. No transit of the planet has been detected, so its inclination must be less than 83°. Because the inclination is unknown, the true mass of the planet is not known.