HD 46375 b

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HD 46375 b
Extrasolar planet List of extrasolar planets
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
Semimajor 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, 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.[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/0004326. Bibcode:2000ApJ...536L..43M. doi:10.1086/312723. 

External links[edit]

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