Astronomy:18 Delphini b
 Radial velocity changes over time of 18 Delphini caused by the orbit of 18 Delphini b. | |
| Discovery | |
|---|---|
| Discovered by | Sato et al.[1] |
| Discovery site | Okayama Planet Search Program  Japan |
| Discovery date | 19 February 2008 |
| radial velocity | |
| Orbital characteristics | |
| 2.6 AU (390,000,000 km) | |
| Eccentricity | 0.08 ± 0.01 |
| Orbital period | 993.3 ± 3.2 d 2.719 y |
| astron|astron|helion}} | 2451672 ± 18 |
| 166.1 ± 6.5 | |
| Star | 18 Delphini |
18 Delphini b (abbreviated 18 Del b), formally named Arion /əˈraɪən/,[2] is an extrasolar planet approximately 249 light-years away in the constellation of Delphinus.
The 993-day period planet orbits the yellow giant star 18 Delphini. A very massive and dense planet with a minimum mass of 10.3 MJ, it was discovered on February 19, 2008, by Bun'ei Sato.[1]
In July 2014, the International Astronomical Union launched NameExoWorlds, a process for giving proper names to certain exoplanets and their host stars.[3] The process involved public nomination and voting for the new names.[4] In December 2015, the IAU announced the name Arion for this planet.[5] 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[6] ('Delphinus' is Latin for 'dolphin').
See also
References
- ↑ 1.0 1.1 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. doi:10.1093/pasj/60.3.539. Bibcode: 2008PASJ...60..539S. https://academic.oup.com/pasj/article/60/3/539/1508408.
- ↑ "Arion". Merriam-Webster Dictionary. https://www.merriam-webster.com/dictionary/Arion.
- ↑ NameExoWorlds: An IAU Worldwide Contest to Name Exoplanets and their Host Stars. IAU.org. 9 July 2014
- ↑ "NameExoWorlds The Process". http://nameexoworlds.iau.org/process.
- ↑ Final Results of NameExoWorlds Public Vote Released, International Astronomical Union, 15 December 2015.
- ↑ "NameExoWorlds The Approved Names". http://nameexoworlds.iau.org/names.
- Jean Schneider (2011). "Notes for Planet 18 Del b". Extrasolar Planets Encyclopaedia. https://exoplanet.eu/catalog/18_del_b--454/.
External links
- da Silva, L. et al. (November 2006), "Basic physical parameters of a selected sample of evolved stars", Astronomy and Astrophysics 458 (2): 609–623, doi:10.1051/0004-6361:20065105, Bibcode: 2006A&A...458..609D – lists data about the star.
Coordinates: 
20h 58m 26s, +10° 50′ 21″
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