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Iota Draconis b

Iota Draconis b looking towards its red giant sun. Artistic image, NASA

Iota Draconis b[1]
Extrasolar planet List of extrasolar planets
Orbital elements
Semimajor axis (a) 1.275 ± 0.074 AU
Eccentricity (e) 0.7124 ± 0.0039
Orbital period (P) 511.098 ± 0.089 d (1.4 y)
Angular distance (θ) 40.476 mas
Longitude of
(ω) 91.58 ± 0.81°
Time of periastron (T0) 2,452,014.59 ± 0.30 JD
Semi-amplitude (K) 307.6 ± 2.3 m/s
Physical characteristics
Mass (m) >8.82 ± 0.72 MJ
Discovery information
Discovery date 2001
Discoverer(s) Frink et al.
Detection method Doppler Spectroscopy
Discovery status Confirmed

Iota Draconis b was discovered in 2001 during a radial velocity study of K-class giant stars and was the first planet discovered orbiting a giant star. It is in an eccentric orbit, which aided its detection as giant stars have pulsations which can mimic the presence of a planet.[2]

See also

* Iota Draconis


  1. ^ Butler et al. (2006). "Catalog of Nearby Exoplanets". The Astrophysical Journal 646: 505 – 522.  (web Preprint)
  2. ^ Frink et al. (2002). "Discovery of a Substellar Companion to the K2 III Giant Iota Draconis". The Astrophysical Journal 576 (1): 478 – 484. 


  • SIMBAD: HD 137759 b
  • SolStation: Edasich/Iota Draconis
  • The Extrasolar Planet Encyclopaedia: Notes for planet HIP 75458 b
  • Extrasolar Visions: Iota Draconis b

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