HD 177565
HD 177565 (HR 7232; LTT 7569; Gliese 744) is a yellow-hued star located in the southern constellation Corona Australis. It has an apparent magnitude of 6.16, placing it near the limit for naked eye visibility, even under ideal conditions. The object is located relatively close at a distance of 55.3 light-years based on Gaia DR3 parallax measurements, but it is receding rapidly with a heliocentric radial velocity of 60.9 km/s. At its current distance, HD 177565's brightness is diminished by interstellar extinction of 0.07 magnitudes and it as an absolute magnitude of +5.00. A 2017 multiplicity survey failed to detect any stellar companions around the star.
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Corona Australis |
| Right ascension | 19h 06m 52.46439s |
| Declination | −37° 48′ 38.3734″ |
| Apparent magnitude (V) | 6.16 |
| Characteristics | |
| Spectral type | G6 V |
| U−B color index | +0.27 |
| B−V color index | +0.70 |
| Astrometry | |
| Radial velocity (Rv) | 60.9±0.8 km/s |
| Proper motion (μ) | RA: −187.700 mas/yr Dec.: −367.009 mas/yr |
| Parallax (π) | 58.9860 ± 0.0376 mas |
| Distance | 55.29 ± 0.04 ly (16.95 ± 0.01 pc) |
| Absolute magnitude (MV) | +5.00 |
| Details | |
| Mass | 0.99+0.03 −0.04 M☉ |
| Radius | 0.985±0.022 R☉ |
| Luminosity | 0.851±0.005 L☉ |
| Surface gravity (log g) | 4.44±0.03 cgs |
| Temperature | 5,627±19 K |
| Metallicity [Fe/H] | 0.08±0.01 dex |
| Rotational velocity (v sin i) | 3 km/s |
| Age | 4.58±1.51 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 177565 has a stellar classification of G6 V, indicating that it is an ordinary G-type main-sequence star like our Sun. The object has also be given a later class of G8 V (Houk 1982) and one source lists it as a G5 subgiant. It has 99% the mass of the Sun and 98.5% the Sun's radius. It radiates 85.1% the luminosity of the Sun from its photosphere at an effective temperature of 5,627 K, making it slightly cooler than the Sun. HD 177565 is slightly metal enriched with an iron abundance at [Fe/H] = +0.08 (120% solar) and it is estimated to be 4.58 billion years old. HD 177565 spins slightly faster than the Sun with a projected rotational velocity of 3 km/s compared to the Sun's rotational velocity of 2 km/s.