HD 177365

HD 177365
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Telescopium
Right ascension 19h 06m 54.81838s[1]
Declination −50° 19′ 23.3136″[1]
Apparent magnitude (V) 6.27±0.01[2]
Characteristics
Spectral type B9 V[3]
B−V color index −0.10[4]
Astrometry
Radial velocity (Rv)15.5±0.7[1] km/s
Proper motion (μ) RA: −2.721 mas/yr[1]
Dec.: −31.275 mas/yr[1]
Parallax (π)8.7497 ± 0.1414 mas[1]
Distance373 ± 6 ly
(114 ± 2 pc)
Absolute magnitude (MV)+0.16[5]
Details
Mass3.05+0.45
−0.33[6] M☉
Radius3.33+0.12
−0.15[6] R☉
Luminosity119[7] L☉
Surface gravity (log g)3.88+0.09
−0.05[6] cgs
Temperature11,557+275
−352[6] K
Metallicity [Fe/H]−0.11[8] dex
Age226[9] Myr
Other designations
46 G. Telescopii[10], CD−50°12326, CPD−50°10955, GC 26265, HD 177365, HIP 93860, SAO 245925, WDS 19070-5019[11]
Database references
SIMBADdata

HD 177365 is a visual binary[12] located in the southern constellation Telescopium. It has an apparent magnitude of 6.27,[2] placing it near the limit for naked eye visibility, even under ideal conditions. Gaia DR3 parallax measurements imply a distance of 373 light-years and it is currently receding with a heliocentric radial velocity of 15.5 km/s.[1] At its current distance, HD 177365's brightness is diminished by two-tenths of a magnitude due to interstellar extinction[13] and it has an absolute magnitude of +0.16.[5]

The binarity of the system was first noticed in a 1996 United States Naval Observatory survey.[14] A Hipparcos proper motion survey published in 2006 catalogued the primary as a probable astrometric binary with an 89.6% chance.[15] HD 177365 B, the companion, is a 16th magnitude star located 101.3" away along a position angle of 218° as of 2015.[14]

The visible component has a stellar classification of B9 V,[3] indicating that it is an ordinary B-type main-sequence star that is generating energy via hydrogen fusion. It has 3.05 times the mass of the Sun[6] and 3.33 times the radius of the Sun.[6] It radiates 119 times the luminosity of the Sun[7] from its photosphere at an effective temperature of 11,557 K.[6] HD 177365 A is slightly metal deficient with an iron abundance 78% that of the Sun's ([Fe/H] = −0.11)[8] and it is estimated to be 226 million years old.[9]

  1. ^ a b c d e f Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference Tycho2000 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Houk1978 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Cousins1962 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  6. ^ a b c d e f g Cite error: The named reference Stassun2019 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference McDonald2017 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference Anders2022 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Gontcharov2012 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Gould1879 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Malkov2016 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Gontcharov2017 was invoked but never defined (see the help page).
  14. ^ a b Cite error: The named reference Mason2001 was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference Frankowski2006 was invoked but never defined (see the help page).