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HD 177565
G-dwarf star w. a planet; Corona Australis / From Wikipedia, the free encyclopedia
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,[2] 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,[1] but it is receding rapidly with a heliocentric radial velocity of 60.9 km/s.[5] At its current distance, HD 177565's brightness is diminished by interstellar extinction of 0.07 magnitudes[15] and it as an absolute magnitude of +5.00.[6] A 2017 multiplicity survey failed to detect any stellar companions around the star.[16]
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Corona Australis |
Right ascension | 19h 06m 52.46439s[1] |
Declination | −37° 48′ 38.3734″[1] |
Apparent magnitude (V) | 6.16[2] |
Characteristics | |
Spectral type | G6 V[3] |
U−B color index | +0.27[4] |
B−V color index | +0.70[4] |
Astrometry | |
Radial velocity (Rv) | 60.9±0.8[5] km/s |
Proper motion (μ) | RA: −187.700 mas/yr[1] Dec.: −367.009 mas/yr[1] |
Parallax (π) | 58.9860 ± 0.0376 mas[1] |
Distance | 55.29 ± 0.04 ly (16.95 ± 0.01 pc) |
Absolute magnitude (MV) | +5.00[6] |
Details | |
Mass | 0.99+0.03 −0.04[7] M☉ |
Radius | 0.985±0.022[8] R☉ |
Luminosity | 0.851±0.005[1] L☉ |
Surface gravity (log g) | 4.44±0.03[9] cgs |
Temperature | 5,627±19[10] K |
Metallicity [Fe/H] | 0.08±0.01[10] dex |
Rotational velocity (v sin i) | 3[11] km/s |
Age | 4.58±1.51[12] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
HD 177565 has a stellar classification of G6 V,[3] 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)[17] and one source lists it as a G5 subgiant.[18] It has 99% the mass of the Sun[7] and 98.5% the Sun's radius.[8] It radiates 85.1% the luminosity of the Sun[1] from its photosphere at an effective temperature of 5,627 K,[10] making it slightly cooler than the Sun. HD 177565 is slightly metal enriched with an iron abundance at [Fe/H] = +0.08 (120% solar)[10] and it is estimated to be 4.58 billion years old.[12] HD 177565 spins slightly faster than the Sun with a projected rotational velocity of 3 km/s[11] compared to the Sun's rotational velocity of 2 km/s.