Mu Arae e

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Mu Arae e
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) 5.235[1] AU
(783.1 Gm)
Periastron (q) 4.719 AU
(705.9 Gm)
Apastron (Q) 5.750 AU
(860.3 Gm)
Eccentricity (e) 0.0985 ± 0.0627[1]
Orbital period (P) 4205.8 ± 758.9[1] d
(11.51 y)
Argument of
(ω) 57.6 ± 43.7[1]°
Time of periastron (T0) 2,450,541 ± 96[1] JD
Semi-amplitude (K) 18.1 ± 1.1[1] m/s
Physical characteristics
Minimum mass (m sin i) 1.814[1] MJ
(576 M)
Discovery information
Discovery date June 13, 2002
Discoverer(s) Butler, Marcy
Discovery method Radial velocity
Discovery site California,  USA
Discovery status Published
Other designations
HD 160691 e, Sancho
Database references
Extrasolar Planets
Exoplanet Archive data
Open Exoplanet Catalogue data

Mu Arae e, also known as HD 160691 e, later named Sancho, is one of the four extrasolar planets orbiting the star Mu Arae of the constellation Ara.

In July 2014 the International Astronomical Union launched a process for giving proper names to certain exoplanets and their host stars.[2] The process involved public nomination and voting for the new names.[3] In December 2015, the IAU announced the winning name was Sancho for this planet.[4] The winning name was submitted by the Planetario de Pamplona, Spain. Sancho was the squire of the lead character of the novel El Ingenioso Hidalgo Don Quixote de la Mancha.[5]

The planet's discovery was announced on June 13, 2002. Mu Arae e is a gas giant at least 1.8 times as massive as Jupiter. The planet orbits at Jupiter-like distance at 5.235 AU.


  1. ^ a b c d e f g 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/0608396Freely accessible. Bibcode:2007A&A...462..769P. doi:10.1051/0004-6361:20066194. 
  2. ^ NameExoWorlds: An IAU Worldwide Contest to Name Exoplanets and their Host Stars. 9 July 2014
  3. ^ NameExoWorlds The Process
  4. ^ Final Results of NameExoWorlds Public Vote Released, International Astronomical Union, 15 December 2015.
  5. ^ NameExoWorlds The Approved Names

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