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HD 220689

<tr><th style="background-color: #FFFFC0; text-align: center;" colspan="2">Astrometry</th></tr></th></tr><tr><th colspan="2" style="text-align: center"></tr><tr style="vertical-align:top;"><td>Proper motion (μ)</td><td> RA: –15.48 ± 0.72[1] mas/yr
Dec.: –179.33 ± 0.64[1] mas/yr </td></tr><tr style="vertical-align:top;"><td>Parallax (π)</td><td>22.44 ± 0.70[1]mas</td></tr><tr style="vertical-align:top;"><td>Distance</td><td>145 ± 5 ly
(45 ± 1 pc)</td></tr><tr><th colspan="2" style="text-align: center"></th></tr> <tr><th style="background-color: #FFFFC0; text-align: center;" colspan="2">Details</th></tr></th></tr><tr><th colspan="2" style="text-align: center"></th></tr><tr style="vertical-align:baseline;"><td>Mass</td><td>1.04 ± 0.03 M</td></tr><tr style="vertical-align:baseline;"><td>Radius</td><td>1.07 ± 0.04 R</td></tr><tr style="vertical-align:baseline;"><td>Luminosity</td><td>1.24 L</td></tr><tr style="vertical-align:baseline;"><td>Surface gravity (log g)</td><td>4.32 ± 0.03 cgs</td></tr><tr style="vertical-align:baseline;"><td>Temperature</td><td>5921 ± 26 K</td></tr><tr style="vertical-align:baseline;"><td>Metallicity [Fe/H]</td><td>0.0 ± 0.03 dex</td></tr><tr style="vertical-align:baseline;"><td>Age</td><td>3.5 ± 1.9 Gyr</td></tr><tr><th colspan="2" style="text-align: center"></th></tr> <tr><th style="background-color: #FFFFC0; text-align: center;" colspan="2">Other designations</th></tr><tr><td colspan="2">
HIP 115662, BD–21 6419
</td></tr>

<tr><th style="background-color: #FFFFC0; text-align: center;" colspan="2">Database references</th></tr><tr style="vertical-align: top;"><td>SIMBAD</td><td>data</tr><tr style="vertical-align: top;"><td>Exoplanet Archive</td><td>data</tr><tr><td>Extrasolar Planets
Encyclopaedia
</td><td>data</td></tr>

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]
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This page is a soft redirect. Apparent magnitude (V)

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This page is a soft redirect. +7.74

Characteristics
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This page is a soft redirect. Spectral type

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This page is a soft redirect. G3V

HD 220689 is a G-class yellow dwarf star.

Planetary system

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 2209Script error: No such module "Su". 0.16Script error: No such module "Su".

References

  1. ^ a b c d e van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. Bibcode:2007A&A...474..653V. arXiv:0708.1752. 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. Bibcode:2013A&A...551A..90M. arXiv:1211.6444. doi:10.1051/0004-6361/201219639. 
  3. ^ "hd_220689_b". 

External links


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