HD 220689

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HD 220689
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Aquarius
Right ascension 23h 25m 52.992s[1]
Declination –20° 36′ 57.71″[1]
Apparent magnitude (V) +7.74
Characteristics
Spectral type G3V
Astrometry
Proper motion (μ) RA: –15.48 ± 0.72[1] mas/yr
Dec.: –179.33 ± 0.64[1] mas/yr
Parallax (π) 22.44 ± 0.70[1] mas
Distance 145 ± 5 ly
(45 ± 1 pc)
Details
Mass 1.04 ± 0.03 M
Radius 1.07 ± 0.04 R
Luminosity 1.24 L
Surface gravity (log g) 4.32 ± 0.03 cgs
Temperature 5921 ± 26 K
Metallicity [Fe/H] 0.0 ± 0.03 dex
Age 3.5 ± 1.9 Gyr
Other designations
HIP 115662, BD–21 6419
Database references
SIMBAD data
Exoplanet Archive data
Extrasolar Planets
Encyclopaedia
data

HD 220689 is a G-class yellow dwarf star.

Planetary system[edit]

From 1998 to 2012, the star was under observation from the CORALIE echelle spectrograph at La Silla Observatory.

In 2012, a long-period, wide-orbiting planet was deduced by radial velocity. This was published in November.[2]

The HD 220689 planetary system[3]
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
(days)
Eccentricity Inclination Radius
b >1.06 ± 0.09 MJ 3.36 ± 0.09 2209+103
−81
0.16+.1
−.07

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. ^ Marmier, M. et al. (2013). "The CORALIE survey for southern extrasolar planets XVII. New and updated long period and massive planets". Astronomy and Astrophysics 551. A90. arXiv:1211.6444. Bibcode:2013A&A...551A..90M. doi:10.1051/0004-6361/201219639. 
  3. ^ "hd_220689_b". 


External links[edit]