14 Andromedae b

14 Andromedae b (abbreviated 14 And b), formally named Spe /ˈspiː/, is an exoplanet approximately 249 light years away in the constellation of Andromeda.

14 Andromedae b / Spe

Radial velocity changes over time of 14 Andromedae caused by the orbit of 14 Andromedae b.
Discovery
Discovered by	Sato et al.[1]
Discovery date	July 2, 2008
Detection method	Doppler Spectroscopy[1]
Designations
Alternative designations	Spe
Orbital characteristics
Semi-major axis	0.83[1] AU (124,000,000 km)
Eccentricity	0[2]
Orbital period (sidereal)	185.84±0.23[2] d
Time of periastron	2861.4 ± 1.5[1]
Semi-amplitude	100.0 ± 1.3[2]
Star	Veritate

The 186-day period planet orbits about 83% the Earth-Sun distance from the giant star 14 Andromedae. It has a minimum mass 4.8 times the mass of Jupiter. The planet orbits with an eccentricity of 0.0094, which means the orbital distance over the course of its revolution varies by only 0.02 AU.^[1]

Nomenclature

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 Spe for this planet.^[5] The winning name was based on that submitted by the Thunder Bay Centre of the Royal Astronomical Society of Canada^[6]); namely 'Spes', Latin for 'hope'. (Spes was also the Roman goddess of hope.) The IAU substituted the ablative form 'Spe', which means 'where there is hope', to match that given to the host star at the same time.^[7]

Discovery

The preprint announcing 14 Andromedae b was submitted to the arXiv electronic repository on July 2, 2008, by Bun'ei Sato and collaborators, who discovered it using the Doppler Spectroscopy method, during the Okayama Planet Search radial velocity survey of G and K giants at Okayama Astrophysical Observatory.^[1]

See also

• 81 Ceti b
• 6 Lyncis b

References

1. Sato, Bun'ei; et al. (2008). "Planetary Companions to Evolved Intermediate-Mass Stars: 14 Andromedae, 81 Ceti, 6 Lyncis, and HD167042". Publications of the Astronomical Society of Japan. 60 (6): 1317–1326. arXiv:0807.0268. Bibcode:2008PASJ...60.1317S. doi:10.1093/pasj/60.6.1317. S2CID 67841762.
2. Ligi, R.; et al. (2012). "A new interferometric study of four exoplanet host stars : θ Cygni, 14 Andromedae, υ Andromedae and 42 Draconis". Astronomy and Astrophysics. 545. A5. arXiv:1208.3895. Bibcode:2012A&A...545A...5L. doi:10.1051/0004-6361/201219467. S2CID 10934982.
3. NameExoWorlds: An IAU Worldwide Contest to Name Exoplanets and their Host Stars. IAU.org. 9 July 2014
4. "NameExoWorlds The Process". Archived from the original on 2015-08-15. Retrieved 2015-09-05.
5. Final Results of NameExoWorlds Public Vote Released, International Astronomical Union, 15 December 2015.
6. Thunder Bay Amateur Astronomers Name a Planet
7. "NameExoWorlds The Approved Names". Archived from the original on 2018-02-01. Retrieved 2015-12-17.

External links

• "14 Andromedae". Exoplanets. Archived from the original on 2009-11-25. Retrieved 2008-08-06.
• Jean Schneider (2011). "Notes for Planet 14 And b". Extrasolar Planets Encyclopaedia. Retrieved 30 September 2011.