HD 166724
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. 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. It is predicted to come as close as 97.0 light-years in around 1.2 million years from now. The star has an absolute magnitude of 6.20.
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Corona Australis |
| Right ascension | 18h 13m 59.67590s |
| Declination | –42° 34′ 31.3558″ |
| Apparent magnitude (V) | +9.33 |
| Characteristics | |
| Spectral type | K0IV/V |
| B−V color index | 0.861±0.032 |
| Astrometry | |
| Radial velocity (Rv) | −17.51±0.20 km/s |
| Proper motion (μ) | RA: +36.061 mas/yr Dec.: –80.180 mas/yr |
| Parallax (π) | 22.0344 ± 0.0177 mas |
| Distance | 148.0 ± 0.1 ly (45.38 ± 0.04 pc) |
| Absolute magnitude (MV) | 6.20 |
| Details | |
| Mass | 0.81±0.02 M☉ |
| Radius | 0.80+0.01 −0.02 R☉ |
| Luminosity | 0.388±0.001 L☉ |
| Surface gravity (log g) | 4.43±0.08 cgs |
| Temperature | 5,101+50 −41 K |
| Metallicity [Fe/H] | −0.09±0.03 dex |
| Age | 4.0±3.8 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
The stellar classification of HD 166724 is K0IV/V, 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. The age of the star is poorly constrained, but it is spinning slowly with a period of around 30 days. It has 81% of the mass of the Sun and 80% of the Sun's girth. The star is radiating 39% of the luminosity of the Sun from its photosphere at an effective temperature of 5,101 K.