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 | |
| 2.476 AU (370,400,000 km) | |
| Eccentricity | 0.08 ± 0.01 |
| 993.3 ± 3.2 d 2.719 y | |
| 2451672 ± 18 | |
| 166.1 ± 6.5 | |
| Star | 18 Delphini |
| Physical characteristics | |
| Mass | 9.207 |
18 Delphini b (abbreviated 18 Del b), formally named Arion /əˈraɪən/,[2] is an extrasolar planet approximately 245 light-years away in the constellation of Delphinus.[3]
The 993-day period planet orbits the Red clump star 18 Delphini 2.476 AU away every 2.719 years. It is a very massive and dense planet with a mass of 9.207 MJ, it was discovered on February 19, 2008, by Bun'ei Sato.[4][1]
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 name Arion for this planet.[7] 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[8] ('Delphinus' is Latin for 'dolphin').
See also
[edit]References
[edit]- ^ a b 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:0802.2590. Bibcode:2008PASJ...60..539S. doi:10.1093/pasj/60.3.539.
- ^ "Arion". Merriam-Webster.com Dictionary. Merriam-Webster.
- ^ Sato, Bun'ei; Izumiura, Hideyuki; Toyota, Eri; Kambe, Eiji; Ikoma, Masahiro; Omiya, Masashi; Masuda, Seiji; Takeda, Yoichi; Murata, Daisuke (2008-02-19), "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:0802.2590, doi:10.1093/pasj/60.3.539
- ^ "18 Delphini b - NASA Science". 2019-04-22. Retrieved 2025-08-30.
- ^ NameExoWorlds: An IAU Worldwide Contest to Name Exoplanets and their Host Stars. IAU.org. 9 July 2014
- ^ "NameExoWorlds The Process". Archived from the original on 2015-08-15. Retrieved 2015-09-05.
- ^ Final Results of NameExoWorlds Public Vote Released, International Astronomical Union, 15 December 2015.
- ^ "NameExoWorlds The Approved Names". Archived from the original on 2018-02-01. Retrieved 2015-12-17.
- Jean Schneider (2011). "Notes for Planet 18 Del b". Extrasolar Planets Encyclopaedia. Retrieved 30 September 2011.
External links
[edit]- 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:astro-ph/0608160. Bibcode:2006A&A...458..609D. doi:10.1051/0004-6361:20065105. S2CID 9341088. – lists data about the star.
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