Mu Arae b

Mu Arae b, often designated HD 160691 b, formally named Quijote /kiˈhoʊtiː/, is an exoplanet orbiting the star Mu Arae of the constellation Ara.

Mu Arae b / Quijote

Simulated image of Mu Arae b
Discovery
Discovered by	Butler, Marcy
Discovery site	California, US
Discovery date	December 12, 2000
Detection method	Doppler Spectroscopy
Orbital characteristics
Apastron	1.689 AU (252,700,000 km)
Periastron	1.304 AU (195,100,000 km)
Semi-major axis	1.497 AU (223,900,000 km)[1]
Eccentricity	0.128[1]
Orbital period (sidereal)	643.25 ± 0.90[1] d 1.7611 y
Time of periastron	2452365.6 ± 12.6[1]
Argument of periastron	22.0 ± 7.0[1]
Semi-amplitude	37.78 ± 0.40
Star	Mu Arae

The planet is at least one and a half times the mass of Jupiter, and its orbital period is 643.25 days. The discovery of this planet was announced on December 12, 2002, and was originally thought to be on a highly eccentric orbit.^[2] The latest models of Mu Arae planetary system, which has four known planets, give a lower eccentricity orbit.^[1] Although the planet itself is likely to be a gas giant with no solid surface, the orbital distance of 1.497 astronomical units from its star puts it within the habitable zone of its planetary system. As a result, large satellites of the planet, if they exist, could potentially support life.^{[improper synthesis?]} However, it may not receive enough ultraviolet light for abiogenesis to proceed.^[3] Furthermore, it is not clear that Earth-size moons can actually be formed in the environment around a gas giant planet.^[4]

Name

In July 2014 the International Astronomical Union launched NameExoWorlds, a process for giving proper names to certain exoplanets and their host stars.^[5] The process involved public nomination and voting for the new names.^[6] In December 2015, the IAU announced the winning name was Quijote for this planet.^[7] The winning name was submitted by the Planetario de Pamplona, Spain. Quijote was the lead character of the novel Don Quixote.^[8] Although the character's name is more commonly spelled Quixote in English, Quijote is the current Spanish spelling.

References

1. 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. S2CID 119071803.
2. Butler, R. Paul; Tinney, C. G.; Marcy, Geoffrey W.; Jones, Hugh R. A.; et al. (2001). "Two New Planets from the Anglo-Australian Planet Search". The Astrophysical Journal. 555 (1): 410–417. Bibcode:2001ApJ...555..410B. doi:10.1086/321467. hdl:2299/137. S2CID 122572834.
3. Buccino, Andrea P.; Lemarchand, Guillermo A.; Mauas, Pablo J. D. (2006). "Ultraviolet Radiation Constraints around the Circumstellar Habitable Zones". Icarus. 183 (2): 491–503. arXiv:astro-ph/0512291. Bibcode:2006Icar..183..491B. doi:10.1016/j.icarus.2006.03.007. S2CID 2241081.
4. Canup, R.; Ward, W. (2006). "A common mass scaling for satellite systems of gaseous planets". Nature. 441 (7095): 834–839. Bibcode:2006Natur.441..834C. doi:10.1038/nature04860. PMID 16778883. S2CID 4327454.
5. NameExoWorlds: An IAU Worldwide Contest to Name Exoplanets and their Host Stars. IAU.org. 9 July 2014
6. "NameExoWorlds The Process". Archived from the original on 2015-08-15. Retrieved 2015-09-05.
7. Final Results of NameExoWorlds Public Vote Released, International Astronomical Union, 15 December 2015.
8. "NameExoWorlds The Approved Names". Archived from the original on 2018-02-01. Retrieved 2016-01-03.