HD 210702 b

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HD 210702 b
Exoplanet List of exoplanets
Parent star
Star HD 210702
Constellation Pegasus
Right ascension (α) 22h 11m 51.33s[1]
Declination (δ) +16° 02′ 26.0″[1]
Distance 179 ± 4[1] ly
(55 ± 1[1] pc)
Spectral type K1IV
Orbital elements
Semi-major axis (a) 1.17 AU
(175 Gm)
Periastron (q) 0.992 AU
(~148 Gm)
Apastron (Q) ~1.35 AU
(~202 Gm)
Eccentricity (e) 0.152 ± 0.08
Orbital period (P) 341.1 d
(0.9339 y)
Orbital speed (υ) 37.44 km/s
Argument of
(ω) 301 ± 30°
Time of periastron (T0) 2453118 ± 40 JD
Semi-amplitude (K) 59 ± 18 m/s
Physical characteristics
Minimum mass (m sin i) 2 MJ
(640 M)
Discovery information
Discovery date April 10, 2007
Discoverer(s) Johnson et al.
Discovery method Doppler spectroscopy
Discovery site Lick and Keck Observatory
Discovery status Confirmed[2]
Database references
Extrasolar Planets
Exoplanet Archive data
Open Exoplanet Catalogue data

HD 210702 b is an exoplanet located approximately 182 light-years away in the constellation of Pegasus, orbiting the star HD 210702. This planet, together with HD 175541 b and HD 192699 b, are planets around intermediate mass stars that were announced in April 2007 by Johnson et al. It has at least twice the mass of Jupiter and it orbits with semimajor axis of 1.17 AU, corresponding to a period of 341.1 days.[3]

Planets around intermediate mass subgiants provide clues for the history of formation and migration of planets around A-type stars.

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:0708.1752free to read. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.  Vizier catalog entry
  2. ^ Bun'ei Sato; et al. (2012). "Substellar Companions to Seven Evolved Intermediate-Mass Stars". PASJ. arXiv:1207.3141free to read. Bibcode:2012PASJ...64..135S. doi:10.1093/pasj/64.6.135. 
  3. ^ Johnson, John Asher; et al. (2007). "Retired A Stars and Their Companions: Exoplanets Orbiting Three Intermediate-Mass Subgiants". The Astrophysical Journal. 665 (1): 785–793. arXiv:0704.2455free to read. Bibcode:2007ApJ...665..785J. doi:10.1086/519677. 

External links[edit]

Coordinates: Sky map 22h 11m 51.3311s, +16° 02′ 25.983″