14 Andromedae b

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14 Andromedae b
Exoplanet List of exoplanets
14 And b rv.pdf
Radial velocity changes over time of 14 Andromedae caused by the orbit of 14 Andromedae b.
Parent star
Star 14 Andromedae
Constellation Andromeda
Right ascension (α) 23h 31m 17.41s[1]
Declination (δ) +39° 14′ 10.3″[1]
Apparent magnitude (mV) 5.22
Distance 258 ± 6[1] ly
(79 ± 2[1] pc)
Spectral type K0III
Orbital elements
Semi-major axis (a) 0.83 AU
(124 Gm)
    11 mas
Periastron (q) 0.82 AU
(123 Gm)
Apastron (Q) 0.84 AU
(125 Gm)
Eccentricity (e) 0[2]
Orbital period (P) 185.84±0.23[2] d
(0.50942 y)
Time of periastron (T0) 2861.4 ± 1.5 JD
Physical characteristics
Mass (m) 5.33 ± 0.57[2] MJ
Discovery information
Discovery date July 3, 2008
Discoverer(s) Sato et al.[3]
Discovery method Doppler Spectroscopy[3]
Discovery status Published[3]
Other designations
Spe, HD 221345 b
Database references
Extrasolar Planets
Exoplanet Archive data
Open Exoplanet Catalogue data

14 Andromedae b (abbreviated 14 And b), also named Spe, is an extrasolar planet approximately 249 light years away in the constellation of Andromeda.

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. This planet was discovered on July 3, 2008 by Sato et al., who discovered the wobbling of 14 Andromedae caused by the planet’s gravity during its orbit with the Doppler spectroscopy.[3]

In July 2014 the International Astronomical Union launched a process for giving proper names to certain exoplanets and their host stars.[4] The process involved public nomination and voting for the new names.[5] In December 2015, the IAU announced the name Spe for this planet.[6] The winning name was based on that submitted by the Thunder Bay Centre of the Royal Astronomical Society of Canada[7]); 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.[8]

See also[edit]


  1. ^ a b c d van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752Freely accessible. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Vizier catalog entry
  2. ^ a b c 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:1208.3895Freely accessible. Bibcode:2012A&A...545A...5L. doi:10.1051/0004-6361/201219467. 
  3. ^ a b c d 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:0807.0268Freely accessible. Bibcode:2008PASJ...60.1317S. doi:10.1093/pasj/60.6.1317. 
  4. ^ NameExoWorlds: An IAU Worldwide Contest to Name Exoplanets and their Host Stars. IAU.org. 9 July 2014
  5. ^ NameExoWorlds The Process
  6. ^ Final Results of NameExoWorlds Public Vote Released, International Astronomical Union, 15 December 2015.
  7. ^ Thunder Bay Amateur Astronomers Name a Planet
  8. ^ NameExoWorlds The Approved Names

External links[edit]

Coordinates: Sky map 23h 31m 17.4139s, +39° 14′ 10.313″