HD 37124

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HD 37124
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Taurus
Right ascension 05h 37m 02.49s[1]
Declination +20° 43′ 50.8″[1]
Apparent magnitude (V) 7.68
Characteristics
Spectral type G4V
B−V color index 0.66
Astrometry
Proper motion (μ) RA: -80.14 ± 1.05[1] mas/yr
Dec.: -419.77 ± 0.65[1] mas/yr
Parallax (π) 29.70 ± 0.70[1] mas
Distance 110 ± 3 ly
(33.7 ± 0.8 pc)
Details
Mass 0.85 M
Radius 0.82 R
Temperature 5610 ± 70 K
Metallicity -0.44 Fe/H
Age 3.33 billion years
Other designations
AGK3R 5002, BD+20°1018, Gliese 209, HIP 26381, G 100-27, SAO 77323
Database references
SIMBAD data

HD 37124 is a yellow dwarf star approximately 110 light-years away in the constellation of Taurus (the Bull). Three extrasolar planets have been found to orbit the star.

Planetary system[edit]

As of 2011, three extrasolar planets have been found to orbit the star. Announced in 1999, the first planet (HD 37124 b)[2] was discovered orbiting its parent star around the inner edge of the habitable zone, causing the planet to have a somewhat similar insolation to that of Venus. A second planet became apparent by 2003, thought to orbit in a 1940 days on an eccentric orbit,[3] but this was subsequently found to be unstable.[4] Solving this, a three-planet solution was announced in 2005:[5] this contained a second planet (HD 37124 c) orbiting at the outer edge of the habitable zone with an insolation similar to that of Mars, and a third planet, (HD 37124 d). While not obviously in any orbital resonances in 2005, an updated solution announced in 2011 found planets c and d to likely be in a 2:1 resonance.[6]

The HD 37124 system[6]
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
(days)
Eccentricity Inclination Radius
b ≥0.675 ± 0.017 MJ 0.53364 ± 0.00020 154.378 ± 0.089 0.054 ± 0.028
c ≥0.652 ± 0.052 MJ 1.7100 ± 0.0065 885.5 ± 5.1 0.125 ± 0.055
d ≥0.696 ± 0.059 MJ 2.807 ± 0.038 1862 ± 38 0.16 ± 0.14

See also[edit]

References[edit]

  1. ^ a b c d e van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.  Vizier catalog entry
  2. ^ Vogt et al.; Marcy, Geoffrey W.; Butler, R. Paul; Apps, Kevin (2000). "Six New Planets from the Keck Precision Velocity Survey". The Astrophysical Journal 536 (2): 902–914. arXiv:astro-ph/9911506. Bibcode:2000ApJ...536..902V. doi:10.1086/308981. 
  3. ^ Butler, R. Paul et al. (2003). "Seven New Keck Planets Orbiting G and K Dwarfs". The Astrophysical Journal 582 (1): 455–466. Bibcode:2003ApJ...582..455B. doi:10.1086/344570. 
  4. ^ Goźdiewski, K. (2003). A dynamical analysis of the HD 37124 planetary system. Bibcode:2003A%26A...398..315G. 
  5. ^ Vogt, Steven S. et al. (2005). "Five New Multicomponent Planetary Systems". The Astrophysical Journal 632 (1): 638–658. Bibcode:2005ApJ...632..638V. doi:10.1086/432901. 
  6. ^ a b Wright, J. T. et al. (2011). "The California Planet Survey. III. A Possible 2:1 Resonance in the Exoplanetary Triple System HD 37124". The Astrophysical Journal 730 (2): 61–145. arXiv:1101.1097. Bibcode:2011ApJ...730...93W. doi:10.1088/0004-637X/730/2/93. 

External links[edit]

Coordinates: Sky map 05h 37m 02.4864s, +20° 43′ 50.836″