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HD 177565

HD 177565
Location of HD 177565 (circled)
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]
Distance55.29 ± 0.04 ly
(16.95 ± 0.01 pc)
Absolute magnitude (MV)+5.00[6]
Details
Mass0.99+0.03
−0.04[7] M☉
Radius0.985±0.022[8] R☉
Luminosity0.851±0.005[1] L☉
Surface gravity (log g)4.44±0.03[9] cgs
Temperature5,627±19[10] K
Metallicity [Fe/H]0.08±0.01[10] dex
Rotational velocity (v sin i)3[11] km/s
Age4.58±1.51[12] Gyr
Other designations
42 G. Coronae Australis[13], CD−37°13049, CPD−37°8466, GC 26283, GJ 744, HD 177565, HIP 93858, HR 7232, SAO 210937, LTT 7569[14]
Database references
SIMBADdata

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]

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.

  1. ^ a b c d e f g Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference Johnson1966 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Gray2006 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Cousins1973 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Valenti2005 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Ramírez2012 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference Masana2006 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Aguilera-Gómez2018 was invoked but never defined (see the help page).
  10. ^ a b c d Cite error: The named reference Sousa2008 was invoked but never defined (see the help page).
  11. ^ a b Cite error: The named reference Nordstrom2004 was invoked but never defined (see the help page).
  12. ^ a b Cite error: The named reference Gomes da Silva2021 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Gould1879 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference Gontcharov2017 was invoked but never defined (see the help page).
  16. ^ Cite error: The named reference Fuhrmann2017 was invoked but never defined (see the help page).
  17. ^ Cite error: The named reference Houk1982 was invoked but never defined (see the help page).
  18. ^ Cite error: The named reference Evans1959 was invoked but never defined (see the help page).

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