Mu Arae d

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Mu Arae d
Exoplanet List of exoplanets
Parent star
Star Mu Arae
Constellation Ara
Right ascension (α) 17h 44m 08.7s
Declination (δ) −51° 50′ 03″
Apparent magnitude (mV) 5.15
Distance 50.6 ± 0.2 ly
(15.51 ± 0.07 pc)
Spectral type G3IV–V
Mass (m) 1.10 ± 0.01 M
Radius (r) 1.36 ± 0.01 R
Temperature (T) 5820 ± 40 K
Metallicity [Fe/H] 0.30 ± 0.01
Age 6.34 ± 0.40 Gyr
Orbital elements
Semi-major axis (a) 0.9210[1] AU
(137.78 Gm)
Periastron (q) 0.8597 AU
(128.61 Gm)
Apastron (Q) 0.9823 AU
(146.96 Gm)
Eccentricity (e) 0.0666 ± 0.0122[1]
Orbital period (P) 310.55 ± 0.83[1] d
(0.8502 y)
Argument of
(ω) 189.6 ± 9.4[1]°
Time of periastron (T0) 2452708.7 ± 8.3[1] JD
Semi-amplitude (K) 14.91 ± 0.59[1] m/s
Physical characteristics
Minimum mass (m sin i) 0.5219[1] MJ
(165.9[1] M)
Discovery information
Discovery date August 5, 2006
Discoverer(s) Goździewski et al.
Mayor, Pepe
Discovery method Doppler Spectroscopy
Discovery site  Chile, South America
Discovery status Published
Other designations
HD 160691 d
Database references
Extrasolar Planets
Exoplanet Archive data
Open Exoplanet Catalogue data

Mu Arae d (also known as HD 160691 d) is an extrasolar planet orbiting the star Mu Arae. The planet has a mass about half that of Jupiter and orbits at a distance of 0.921 AU from the star with a period of 310.55 days. The planet may be located at a distance close enough to the star to receive a comparable amount of ultraviolet radiation as the Earth does from the Sun, however it is too close to the star to be able to support liquid water at its surface.[2] Furthermore, given its mass, the planet is likely to be a gas giant with no solid surface.

The planet and its host star is one of the planetary systems selected by the International Astronomical Union as part of their public process for giving proper names to exoplanets and their host star (where no proper name already exists).[3][4] The process involves public nomination and voting for the new names, and the IAU plans to announce the new names in mid-November 2015.[5]


  1. ^ a b c d e f g h Pepe, F.; Correia, A. C. M.; Mayor, M.; Tamuz, O.; et al. (2007). "The HARPS search for southern extra-solar planets. VIII. μ Arae, a system with four planets". Astronomy and Astrophysics 462 (2): 769–776. arXiv:astro-ph/0608396. Bibcode:2007A&A...462..769P. doi:10.1051/0004-6361:20066194. 
  2. ^ Buccino, A.; et al. (2006). "Ultraviolet Radiation Constraints around the Circumstellar Habitable Zones". Icarus 183 (2): 491–503. arXiv:astro-ph/0512291. doi:10.1016/j.icarus.2006.03.007. 
  3. ^ NameExoWorlds: An IAU Worldwide Contest to Name Exoplanets and their Host Stars. 9 July 2014
  4. ^ NameExoWorlds.
  5. ^ NameExoWorlds.

Coordinates: Sky map 17h 44m 08.7s, −51° 50′ 03″