HD 1461 c

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HD 1461 c
Extrasolar planet List of extrasolar planets
Parent star
Star HD 1461
Constellation Cetus
Right ascension (α) 00h 18m 41.62s
Declination (δ) −08° 03′ 9.5″
Apparent magnitude (mV) 6.47
Distance 76 ly
(23.3 pc)
Spectral type G0V
Mass (m) 1.08 ± 0.04 M
Radius (r) 1.095 ± 0.026 R
Temperature (T) 5765 ± 18 K
Metallicity [Fe/H] 0.19 ± 0.01
Age 6.3 Gyr
Orbital elements
Semimajor axis (a) 0.1117 ± 0.0018[1] AU
(16.71 Gm)
Periastron (q) 0.1090 AU
(16.31 Gm)
Apastron (Q) 0.1144 AU
(17.11 Gm)
Eccentricity (e) 0.024
Orbital period (P) 13.505 ± 0.0031[1] d
(0.03697 y)
    (324.12 h)
Orbital speed (υ) 91.97 km/s
Physical characteristics
Minimum mass (m sin i) 5.91 ± 0.76[1] M
Discovery information
Discovery date 2011-09-12
Discoverer(s) Mayor et al.
Discovery method Radial velocity (HARPS)
Discovery site Keck Observatory
Anglo-Australian Observatory
Discovery status Preprint[1]
Database references
Extrasolar Planets

HD 1461 c is an extrasolar planet, orbiting the 6th magnitude G-type main sequence star HD 1461, 76 light years away in the constellation Cetus. This planet has a minimum mass 5.9 times that of Earth, placing this planet in the super-Earth regime. Like most other super-Earths discovered so far, this one orbits close to its star, at 0.11174 AU taking just 13.5 days to orbit. The composition of this planet is unknown since this planet was found using an indirect method, probably a rocky planet with icy interior and thick blanket of hydrogen and helium. This planet was discovered on 12 September 2011 using radial velocity method at Keck and Anglo-Australian Observatories.[1]


  1. ^ a b c d e Mayor et al. (September 2011). "The HARPS search for southern extra-solar planets XXXIV. Occurrence, mass distribution and orbital properties of super-Earths and Neptune-mass planets". arXiv:1109.2497.

Coordinates: Sky map 00h 18m 41.62s, −8° 03′ 9.5″