Iota Draconis b

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Iota Draconis b[1]
Extrasolar planet List of extrasolar planets
Artist's concept of Iota Draconis b looking towards its giant sun
Parent star
Star Iota Draconis
Constellation Draco
Right ascension (α) 15h 24m 55.7747s
Declination (δ) +58° 57′ 57.836″
Apparent magnitude (mV) 3.31
Distance 102.7 ly
(31.5 pc)
Spectral type K2III
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)
Argument 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
Minimum mass (m sin i) 8.82 ± 0.72 MJ
Stellar flux (F) 34.3
Discovery information
Discovery date January 8, 2002
Discoverer(s) Frink et al.
Discovery method Doppler Spectroscopy
Discovery status Confirmed
Other designations
HD 137759 b, HIP 75458 b
Database references
Extrasolar Planets

Iota Draconis b was discovered in 2002 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]


  1. ^ Butler et al.; Wright, J. T.; Marcy, G. W.; Fischer, D. A.; Vogt, S. S.; Tinney, C. G.; Jones, H. R. A.; Carter, B. D. et al. (2006). "Catalog of Nearby Exoplanets". The Astrophysical Journal 646 (1): 505–522. arXiv:astro-ph/0607493. Bibcode:2006ApJ...646..505B. doi:10.1086/504701. 
  2. ^ Frink et al.; Mitchell, David S.; Quirrenbach, Andreas; Fischer, Debra A.; Marcy, Geoffrey W.; Butler, R. Paul (2002). "Discovery of a Substellar Companion to the K2 III Giant Iota Draconis". The Astrophysical Journal 576 (1): 478–484. Bibcode:2002ApJ...576..478F. doi:10.1086/341629. 

External links[edit]

Coordinates: Sky map 15h 24m 55.7747s, +58° 57′ 57.836″