HD 131664

HD 131664
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Apus
Right ascension 15h 00m 06.0762s
Declination –73° 32′ 07.213″
Apparent magnitude (V) 8.13
Distance180.8 ± 7.5 ly
(55.43 ± 2.3 pc)
Spectral typeG3V
Other designations
CD–73° 1031, HIP 73408
Database references
SIMBADdata
Exoplanet Archivedata
Extrasolar Planets
Encyclopaedia		data

HD 131664 is an 8th magnitude G-type main sequence star located approximately 181 light-years away in the constellation of Apus. The star is particularly metal-rich ([Fe/H] = 0.32) in comparison with the mean metallicity of the solar neighborhood.

On October 26, 2008, a brown dwarf was discovered in a planetary orbit and designated HD 131664 b.[1] This brown dwarf has mass of at least 18.15 times that of Jupiter and orbits in a long-period, eccentric orbit. This period (1951 days or 5.34 years) is among the dozen longest exoplanet periods known so far.[2] Follow-up studies with the Hipparcos satellite adjusted the predicted mass of the companion to 23 times that of Jupiter (minimum of 18 and maximum of 49 Jovian masses).[3]


The HD 131664 planetary system[2]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b ≥18.15 ± 0.35 MJ 3.17 ± 0.03 1951 ± 41 0.638 ± 0.02 — —

See also

References

  1. ↑ "Planet HD 131664 b". exoplanet.eu. Retrieved 11 October 2018.
  2. 1 2 Moutou, C.; et al. (2009). "The HARPS search for southern extra-solar planets XVII. Six long-period giant planets around BD -17 0063, HD 20868, HD 73267, HD 131664, HD 145377, HD 153950". Astronomy and Astrophysics. 496 (2): 513–519. arXiv:0810.4662. Bibcode:2009A&A...496..513M. doi:10.1051/0004-6361:200810941.
  3. ↑ Reffert, S.; Quirrenbach, A. (2011). "Mass constraints on substellar companion candidates from the re-reduced Hipparcos intermediate astrometric data: nine confirmed planets and two confirmed brown dwarfs". Astronomy & Astrophysics. 527. id.A140. arXiv:1101.2227. Bibcode:2011A&A...527A.140R. doi:10.1051/0004-6361/201015861.


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