HD 205739

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HD 205739
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Piscis Austrinus
Right ascension 21h 38m 08.404s[1]
Declination −31° 44′ 14.96″ [1]
Apparent magnitude (V) 8.56
Characteristics
Spectral type F7 V
B−V color index 0.546
Astrometry
Radial velocity (Rv) 9.1 km/s
Proper motion (μ) RA: 20.94 ± 0.90[1] mas/yr
Dec.: -83.69 ± 0.53[1] mas/yr
Parallax (π) 9.28 ± 0.84[1] mas
Distance 350 ± 30 ly
(108 ± 10 pc)
Absolute magnitude (MV) 3.78
Details
Mass 1.22 M
Radius 1.33 R
Luminosity 2.3 L
Temperature 6176 ± 45 K
Metallicity +0.19 ± 0.04
Age 2.84 Gyr years
Other designations
HIP 106824, PPM 301636, SAO 213152
Database references
SIMBAD data
Extrasolar Planets
Encyclopaedia
data
Data sources:
Hipparcos Catalogue,
HD

HD 205739 is a yellow-white dwarf (spectral type F7 V). It is about 108 parsecs away from the Sun.[1]

A Jupiter-like planet has recently been detected in a Mercury-like eccentric orbit around this star.

There is a trend in the results which may point to an additional companion further from its star.[2]

The HD 205739 system[2]
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
(days)
Eccentricity Inclination Radius
b >1.37 MJ 0.896 279.8 ± 0.1 0.27 ± 0.07

See also[edit]

References[edit]

  1. ^ a b c d e f 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. ^ a b López-Morales, Mercedes et al. (2008). "Two Jupiter-Mass Planets Orbiting HD 154672 and HD 205739". The Astronomical Journal 136 (5): 1901–1905. arXiv:0809.1037. Bibcode:2008AJ....136.1901L. doi:10.1088/0004-6256/136/5/1901. 

Coordinates: Sky map 21h 38m 08.4055s, −31° 44′ 14.945″