18 Delphini b

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18 Delphini b
Extrasolar planet List of extrasolar planets
Planet 18 Delphini b.png
Artist's conception of 18 Delphini b, as a "Super-Jupiter".
Parent star
Star 18 Delphini
Constellation Delphinus
Right ascension (α) 20h 58m 26s
Declination (δ) +10° 50′ 21″
Apparent magnitude (mV) 5.52
Distance 238 ± 11 ly
(73.1 ± 3.5 pc)
Spectral type G6III
Orbital elements
Semimajor axis (a) 2.6 AU
(390 Gm)
    35 mas
Periastron (q) 2.4 AU
(360 Gm)
Apastron (Q) 2.8 AU
(420 Gm)
Eccentricity (e) 0.08 ± 0.01
Orbital period (P) 993.3 ± 3.2 d
(2.719 y)
Argument of
periastron
(ω) 166.1 ± 6.5°
Time of periastron (T0) 2451672 ± 18 JD
Physical characteristics
Minimum mass (m sin i) 10.3 MJ
Discovery information
Discovery date 19 February 2008
Discoverer(s) Sato et al.[1]
Discovery method radial velocity
Discovery site Okayama Planet
Search Program

 Japan
Discovery status Published[1]
Other designations
HD 199665 b, HIP 103527 b, HR 8030 b
Database references
Extrasolar Planets
Encyclopaedia
data
SIMBAD data

18 Delphini b or 18 Del b is a very massive and dense planet approximately 238 light-years away in the constellation of Delphinus. The planet orbits the yellow giant star 18 Delphini. The planet has a minimum mass of 10.3 MJ and a period of 993 days. This planet was discovered on February 19, 2008 by Sato.[1]

Radial velocity changes over time of 18 Delphini caused by the orbit of 18 Delphini b.

See also[edit]

References[edit]

  1. ^ a b c 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″