HD 167965

HD 167965
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Lyra
Right ascension 18h 15m 38.77722s[1]
Declination +42° 09′ 33.6439″[1]
Apparent magnitude (V) 5.56[2]
Characteristics
Spectral type B7IV[3][2][4] or B8V[5]
U−B color index –0.469[2]
B−V color index −0.111±0.001[2]
Astrometry
Radial velocity (Rv)−20.5±0.9[2] km/s
Proper motion (μ) RA: –2.618[1] mas/yr
Dec.: 0.815[1] mas/yr
Parallax (π)5.5547 ± 0.1389 mas[1]
Distance590 ± 10 ly
(180 ± 5 pc)
Absolute bolometric
magnitude (Mbol)		−0.73[2]
Details
Mass4.00±0.01 M☉[6]
4.498±0.225[7] M☉
Radius3.2 R☉[8]
4.006±0.200[7] R☉
Luminosity337.52[2] L☉
Luminosity (bolometric)381[6] L☉
Temperature13,100[6] K
Rotational velocity (v sin i)187±14 km/s[9]
201[10] km/s
Other designations
BD+42°3035, FK5 684, GC 24936, HD 167965, HIP 89482, HR 6845, SAO 47342[11]
Database references
SIMBADdata

HD 167965 is a single[4][7] star in the northern constellation of Lyra. It is dimly visible to the naked eye on a sufficiently dark night, having an apparent visual magnitude of 5.56.[2] The star is located at a distance of approximately 590 light years from the Sun based on parallax. It is drifting closer with a radial velocity of −20.5 km/s and is predicted to come as near as 72.7 light-years in around 8.5 million years.[2]

The stellar classification of HD 167965 is B7IV,[3] matching a late B-type star that may have left the main sequence. It is spinning rapidly with a projected rotational velocity of 187 km/s.[9] The star has four times the mass and radius of the Sun, and is radiating 381 times the luminosity of the Sun from its photosphere at an effective temperature of 13,100 K.[6]

In 1925, Otto Struve included this star in a list of newly discovered spectroscopic binaries,[12] although that is no longer held to be the case.[4][7]

  1. ^ a b c d e Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d e f g h i Cite error: The named reference Anderson_Francis_2012 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Lesh1968 was invoked but never defined (see the help page).
  4. ^ a b c Cite error: The named reference Eggleton_Tokovinin_2008 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Palmer_et_al_1968 was invoked but never defined (see the help page).
  6. ^ a b c d Cite error: The named reference Hohle_et_al_2010 was invoked but never defined (see the help page).
  7. ^ a b c d Cite error: The named reference Kervella_et_al_2019 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Pasinetti_Fracassini_et_al_2001 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Stoeckley_et_al_1984 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference uesugi_fukuda_1970 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 Struve1925 was invoked but never defined (see the help page).