HD 30177 b

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HD 30177 b
Exoplanet List of exoplanets
Parent star
Star HD 30177
Constellation Dorado
Right ascension (α) 04h 41m 54.3731s
Declination (δ) –58° 01′ 14.725″
Apparent magnitude (mV) 8.41
Distance 178.4 ly
(54.7 pc)
Spectral type G8V
Orbital elements
Semi-major axis (a) 3.95 ± 0.05 AU
(591 Gm)
    72.2 mas
Periastron (q) 3.19 AU
(477 Gm)
Apastron (Q) 4.71 AU
(705 Gm)
Eccentricity (e) 0.193 ± 0.025
Orbital period (P) 2770 ± 100 d
(7.58 y)
Orbital speed (υ) 15.6 km/s
Argument of
(ω) 34 ± 15°
Time of periastron (T0) 2451437 ± 72 JD
Semi-amplitude (K) 146.8 ± 2.8 m/s
Physical characteristics
Minimum mass (m sin i) 10.52 ± 0.20 MJ
Discovery information
Discovery date June 13, 2002
Discoverer(s) Tinney, Butler, Marcy et al.
Discovery method radial velocity
Discovery site Anglo-Australian Planet Search
Discovery status Published

HD 30177 b is an extrasolar planet located approximately 178 light-years away in the constellation of Dorado, orbiting the star HD 30177. This is one of the most massive planets ever detected by the radial velocity method. In addition, the planet orbits far from the star, about 4 AU away, taking 2770 days (7.58 years) to orbit the star. Even though the massive planet is orbiting at 4 AU from the star, the radial velocity semi-amplitude is high, around 146.8±2.8 m/s. Since the inclination (and thus the true mass) is not known, this planet candidate may in fact be a brown dwarf.

This planet was discovered on June 13, 2002 by Tinney, Butler, and Marcy et al. using the Doppler spectroscopy from the Anglo-Australian Telescope.[1][2]

See also[edit]


  1. ^ Tinney, C. G.; et al. (2003). "Four New Planets Orbiting Metal-enriched Stars". The Astrophysical Journal. 587 (1): 423–428. Bibcode:2003ApJ...587..423T. arXiv:astro-ph/0207128Freely accessible. doi:10.1086/368068. 
  2. ^ Butler, R. P.; et al. (2006). "Catalog of Nearby Exoplanets". The Astrophysical Journal. 646 (1): 505–522. Bibcode:2006ApJ...646..505B. arXiv:astro-ph/0607493Freely accessible. doi:10.1086/504701. 

External links[edit]

Coordinates: Sky map 04h 41m 54.3731s, −58° 01′ 14.725″