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HD 166724

HD 166724
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Corona Australis
Right ascension 18h 13m 59.67590s[1]
Declination –42° 34′ 31.3558″[1]
Apparent magnitude (V) +9.33[2]
Characteristics
Spectral type K0IV/V[3]
B−V color index 0.861±0.032[2]
Astrometry
Radial velocity (Rv)−17.51±0.20[1] km/s
Proper motion (μ) RA: +36.061 mas/yr[1]
Dec.: –80.180 mas/yr[1]
Parallax (π)22.0344 ± 0.0177 mas[1]
Distance148.0 ± 0.1 ly
(45.38 ± 0.04 pc)
Absolute magnitude (MV)6.20[2]
Details[4]
Mass0.81±0.02 M☉
Radius0.80+0.01
−0.02[5] R☉
Luminosity0.388±0.001[5] L☉
Surface gravity (log g)4.43±0.08 cgs
Temperature5,101+50
−41[5] K
Metallicity [Fe/H]−0.09±0.03 dex
Age4.0±3.8 Gyr
Other designations
CD–42° 13019, HD 166724, HIP 89354[6]
Database references
SIMBADdata
Exoplanet Archivedata

HD 166724 is a star in the southern constellation of Corona Australis. It is invisible to the naked eye with an apparent visual magnitude of +9.33.[2] The star is located at a distance of 148 light-years (45 parsecs) from the Sun based on parallax, but is drifting closer with a radial velocity of −18 km/s.[1] It is predicted to come as close as 97.0 light-years in around 1.2 million years from now.[2] The star has an absolute magnitude of 6.20.[2]

The stellar classification of HD 166724 is K0IV/V,[3] showing blended features of a K-type main-sequence star with a more evolved subgiant star. It is slightly active with chromospheric activity being demonstrated by an emission peak in the Ca II K absorption line.[4] The age of the star is poorly constrained, but it is spinning slowly with a period of around 30 days.[4] It has 81% of the mass of the Sun and 80%[4] of the Sun's girth. The star is radiating 39%[5] of the luminosity of the Sun from its photosphere at an effective temperature of 5,101 K.[4]

  1. ^ a b c d e f Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  2. ^ a b c d e f Cite error: The named reference Anderson_Francis_2012 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference houk1978 was invoked but never defined (see the help page).
  4. ^ a b c d e Cite error: The named reference Marmier2013 was invoked but never defined (see the help page).
  5. ^ a b c d Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).

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