HD 166724

HD 166724
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Corona Australis
Right ascension 18h 13m 59.676s[1]
Declination –42° 34 31.35[1]
Apparent magnitude (V) +9.33
Characteristics
Spectral type K0IV
Astrometry
Proper motion (μ) RA: 36.60 ± 1.59[1] mas/yr
Dec.: –78.62 ± 0.99[1] mas/yr
Parallax (π)23.63 ± 1.21[1] mas
Distance138 ± 7 ly
(42 ± 2 pc)
Details
Mass0.81 ± 0.02 M
Radius0.81 ± 0.02 R
Luminosity0.31 L
Surface gravity (log g)4.41 ± 0.04 cgs
Temperature5362 ± 29 K
Metallicity [Fe/H]–0.09 ± 0.03 dex
Age4.0 ± 3.8 Gyr
Other designations
HIP 89354, CD–42 13019
Database references
SIMBADdata
Exoplanet Archivedata
Extrasolar Planets
Encyclopaedia
data

HD 166724 is a K-class dwarf star.

Planetary system

From 1998 to 2012, the star was under observance 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.

The discoverers noted that HD 166724 b is among "the three most eccentric planets with a period larger than 5 years" alongside HD 98649 b and HD 219077 b; but unlike them, too dim as a candidate for direct imaging with current technology. The reason for this eccentricity is unknown.[2]

The HD 166724 planetary system[3]
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
(days)
Eccentricity Inclination Radius
b >3.53 ± 0.11 MJ 5.42 ± 0.43 5144+705
467
0.734 ± 0.020

References

  1. 1 2 3 4 5 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752Freely accessible. 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:1211.6444Freely accessible. Bibcode:2013A&A...551A..90M. doi:10.1051/0004-6361/201219639.
  3. "hd_166724_b".


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