Mu Arae d

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Mu Arae d
Extrasolar planet List of extrasolar planets
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
Semimajor 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

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.


  1. ^ a b c d e f g h Pepe, F.; Correia, A. C. M.; Mayor, M.; Tamuz, O.; Couetdic, J.; Benz, W.; Bertaux, J.-L.; Bouchy, F.; Laskar, J.; Lovis, C.; Naef, D.; Queloz, D.; Santos, N. C.; Sivan, J.-P.; Sosnowska, D.; Udry, S. (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. 

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