HD 46375 b

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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
(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 United States California, United States
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.[1]


  1. ^ Marcy, Geoffrey W.; et al. (2000). "Sub-Saturn Planetary Candidates of HD 16141 and HD 46375". The Astrophysical Journal Letters. 536 (1): L43–L46. arXiv:astro-ph/0004326Freely accessible. Bibcode:2000ApJ...536L..43M. doi:10.1086/312723. 

External links[edit]

Coordinates: Sky map 06h 33m 12.6237s, +05° 27′ 46.532″