18 Delphini

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18 Delphini
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Delphinus
Right ascension 20h 58m 25.93s
Declination +10° 50' 21.43″
Apparent magnitude (V) 5.522
Absolute magnitude (V) 1.202
Distance 238.493 ly
(73.121 pc)
Spectral type G6III:
Other designations
Database references

18 Delphini or 18 Del is a yellow giant star approximately 238 light-years away in the constellation of Delphinus. As of 2008, an extrasolar planet was confirmed to be orbiting the star.

Planetary system[edit]

On February 19, 2008, a 10.3 Jupiter mass extrasolar planet (named 18 Delphini b) is found orbiting around the star.[1]

The 18 Delphini planetary system[1]
(in order from star)
Mass Semimajor axis
Orbital period
Eccentricity Inclination Radius
b >10.3 MJ 2.6 993.3 ± 3.2 0.08 ± 0.01


  1. ^ 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. 

External links[edit]

Coordinates: Sky map 20h 58m 26s, +10° 50′ 21″