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HD 219134 b

HD 219134 b
Exoplanet List of exoplanets

An Artists impression of the hot rocky exoplanet HD 219134 b.
Parent star
Star HR 8832
Constellation Cassiopeia
Right ascension (α) 23h 13m 16.97632s[1]
Declination (δ) +57° 10′ 06.0823″[1]
Apparent magnitude (mV) 5.574[2]
Distance 21.25[3] ly
(6.52 pc)
Spectral type K3 V[4]
Temperature (T) 4710[4] K
Observed separation
Orbital elements
Semi-major axis (a) 0.0382 ± 0.0003[5] AU
Eccentricity (e) 0.00+0.13
Orbital period (P) 3.0937 ± 0.0004[5] d
Inclination (i) 85.058 ± 0.08[5]°
Physical characteristics
Mass (m) 4.47 ± 0.47[5] M
Radius (r) 1.606 ± 0.086[5] R
Density (ρ) 5.89 ± 1.17[5] g cm−3
Discovery information
Discovery date 2015 July 30
Discovery method radial velocity method (HARPS-N); transiting (Spitzer telescope)
Discovery site HARPS-N of the Telescopio Nazionale Galileo
Discovery status Published
Database references
Extrasolar Planets
Exoplanet Archive data
Open Exoplanet Catalogue data

HD 219134 b (or HR 8832 b) is one of four exoplanets orbiting HR 8832, a main-sequence star in the constellation of Cassiopeia.[3][6][5][7] As of July 2015, super-Earth HD 219134 b, with a size of about 1.6 Earth Radii, and a density of 6g/cm3, was reported as the closest rocky exoplanet to the Earth, at 21.25 light-years away.[3] The exoplanet was initially detected by the instrument HARPS-N of the Italian Telescopio Nazionale Galileo via the radial velocity method and subsequently observed by the Spitzer telescope as transiting in front of its star.[3][6] The exoplanet has a mass of about 4.5 times that of Earth and orbits its host star every three days.[3]

Star HR 8832 (circled) lies just off the "W" shape of the constellation Cassiopeia.

See also


  1. ^ a b van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664,  
  2. ^ Oja, T. (August 1986), "UBV photometry of stars whose positions are accurately known. III", Astronomy and Astrophysics Supplement Series 65 (2): 405–409,  
  3. ^ a b c d e Chou, Felicia; Clavin, Whitney (30 July 2015). "NASA's Spitzer Confirms Closest Rocky Exoplanet".  
  4. ^ a b Frasca, A.; et al. (December 2009), "REM near-IR and optical photometric monitoring of pre-main sequence stars in Orion. Rotation periods and starspot parameters", Astronomy and Astrophysics 508 (3): 1313–1330,  
  5. ^ a b c d e f g h Motalebi, F.; et al. "The HARPS-N Rocky Planet Search, I. HD 219134b: A transiting rocky planet in a multi-planet system at 6.5 pc from the Sun".  
  6. ^ a b "PIA19832: Location of Nearest Rocky Exoplanet Known".  

External links

  • Cassiopeia Constellation at Constellation Guide
  • The Deep Photographic Guide to the Constellations: Cassiopeia

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