18 Delphini b
|Exoplanet||List of exoplanets|
|Right ascension||(α)||20h 58m 26s|
|Declination||(δ)||+10° 50′ 21″|
|Distance||238 ± 11 ly
(73.1 ± 3.5 pc)
|Semi-major axis||(a)||2.6 AU
|Eccentricity||(e)||0.08 ± 0.01|
|Orbital period||(P)||993.3 ± 3.2 d
|(ω)||166.1 ± 6.5°|
|Time of periastron||(T0)||2451672 ± 18 JD|
|Minimum mass||(m sin i)||10.3 MJ|
|Discovery date||19 February 2008|
|Discoverer(s)||Sato et al.|
|Discovery method||radial velocity|
|Discovery site||Okayama Planet
|Open Exoplanet Catalogue||data|
In July 2014 the International Astronomical Union launched a process for giving proper names to certain exoplanets and their host stars. The process involved public nomination and voting for the new names. In December 2015, the IAU announced the name Arion for this planet. The winning name was submitted by the Tokushima Prefectural Jonan High School Science Club of Japan. Arion was a genius of poetry and music in ancient Greece. According to legend, his life was saved at sea by dolphins after attracting their attention by the playing of his kithara  ('Delphinus' is Latin for 'dolphin').
- Sato, Bun'ei; et al. (2008). "Planetary Companions around Three Intermediate-Mass G and K Giants: 18 Delphini, ξ Aquilae and HD 81688". Publications of the Astronomical Society of Japan. 60 (3): 539–550. arXiv: . Bibcode:2008PASJ...60..539S. doi:10.1093/pasj/60.3.539.
- NameExoWorlds: An IAU Worldwide Contest to Name Exoplanets and their Host Stars. IAU.org. 9 July 2014
- NameExoWorlds The Process
- Final Results of NameExoWorlds Public Vote Released, International Astronomical Union, 15 December 2015.
- NameExoWorlds The Approved Names
- Jean Schneider (2011). "Notes for Planet 18 Del b". Extrasolar Planets Encyclopaedia. Retrieved 30 September 2011.
- da Silva, L.; et al. (November 2006), "Basic physical parameters of a selected sample of evolved stars", Astronomy and Astrophysics, 458 (2): 609–623, arXiv: , Bibcode:2006A&A...458..609D, doi:10.1051/0004-6361:20065105 – lists data about the star.
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