HD 168592
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  | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Corona Australis |
| Right ascension | 18h 22m 18.57340s[1] |
| Declination | −38° 39′ 24.8261″[1] |
| Apparent magnitude (V) | 5.07±0.01[2] |
| Characteristics | |
| Spectral type | K4/5 III[3] |
| B−V color index | +1.49[4] |
| Astrometry | |
| Radial velocity (Rv) | 17.8±2.8[5] km/s |
| Proper motion (μ) | RA: −41.570 mas/yr[1] Dec.: −29.379 mas/yr[1] |
| Parallax (π) | 6.7176±0.1706 mas[1] |
| Distance | 490 ± 10 ly (149 ± 4 pc) |
| Absolute magnitude (MV) | −0.76[6] |
| Details | |
| Mass | 1.18[7] M☉ |
| Radius | 43.6±2.2[8] R☉ |
| Luminosity | 666+44 −40[1] L☉ |
| Surface gravity (log g) | 1.34[7] cgs |
| Temperature | 4,148±122[9] K |
| Metallicity [Fe/H] | −0.13±0.01[10] dex |
| Rotational velocity (v sin i) | 1.9±1.3[11] km/s |
| Other designations | |
| 7 G. Coronae Australis[12], CD−38°12729, CPD−38°7475, GC 25051, HD 168592, HIP 90037, HR 6862, SAO 210048[13] | |
| Database references | |
| SIMBAD | data |
HD 168592, also designated as HR 6862 or rarely 7 G. Coronae Australis, is a solitary star[14] located in the southern constellation Corona Australis. It is faintly visible to the naked eye as an orange-hued star with an apparent magnitude of 5.07. Gaia DR3 parallax measurements place it at a distance of 490 light years[1] and is currently receding with a heliocentric radial velocity of 18 km/s.[5] At its current distance, HD 168592's brightness is diminished by 0.38 magnitudes due to interstellar dust.[15] It has an absolute magnitude of −0.76.[6]
HD 168592 has a stellar classification of K4/5 III,[3] indicating that it is an evolved K-type star with the characteristics of a K4 and K5 giant star. It has a comparable mass to the Sun[7] but the star has expanded to 43.6 times the Sun's radius.[8] It radiates 666 times the luminosity of the Sun[1] from its enlarged photosphere at an effective temperature of 4,148 K.[9] HD 168592 is slightly metal deficient with an iron abundance 26% below solar levels.[10] The star spins slowly, as is common for giant stars, with a projected rotational velocity of 1.9 km/s.[11]
