HD 79940

This article is about k1 Velorum. Not to be confused with κ (Kappa) Velorum.
HD 79940
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Vela
Right ascension 09h 15m 45.07943s[1]
Declination −37° 24′ 47.3124″[1]
Apparent magnitude (V) 4.63[2]
Characteristics
Spectral type F3/5V[3] or F5III[4][5]
B−V color index 0.473±0.002[2]
Astrometry
Radial velocity (Rv)+5.8±2.8[2] km/s
Proper motion (μ) RA: +14.128[1] mas/yr
Dec.: −8.111[1] mas/yr
Parallax (π)20.5985 ± 0.1895 mas[1]
Distance158 ± 1 ly
(48.5 ± 0.4 pc)
Absolute magnitude (MV)1.12[2]
Details[6]
Mass1.36[6] M☉
Radius4.35+0.11
−0.19[1] R☉
Luminosity28.427±0.305[1] L☉
Surface gravity (log g)3.26±0.14[6] cgs
Temperature6,388+143
−76[1] K
Metallicity [Fe/H]0.20±0.15[2] dex
Rotational velocity (v sin i)117.2±5.9[7] km/s
Age2.76[6] Gyr
Other designations
k1 Vel, CD−36 5505, GJ 339.3, GJ 9293, HD 79940, HIP 45448, HR 3684, SAO 200163, WDS J09158-3725A[8]
Database references
SIMBADdata

HD 79940 is a single[9] star in the southern constellation of Vela. It has the Bayer designation of k1 Velorum; HD 79940 is the identifier from the Henry Draper Catalogue. This star has a yellow-white hue and is faintly visible to the naked eye as a point light source with an apparent visual magnitude of 4.63.[2] It is located at a distance of approximately 158 light-years from the Sun based on parallax, and is drifting further away with a radial velocity of +6 km/s.[2]

There has been some disagreement over the stellar classification of this star. In 1975, S. Maladora found a class of F5III, suggesting an evolved F-type star,[4] matching an earlier (1957) classification by A. de Vaucouleurs.[5] N. Houk assigned it a class of F3/5V in 1979, matching an F-type main-sequence star.[3] It has a high rate of spin with a projected rotational velocity of 117.2±5.9 km/s.[7] This may explain why it was incorrectly classified as a spectroscopic binary in 1972.[9]

There is a faint magnitude 14.50 companion at an angular separation of 11.3″ along a position angle of 126° from the brighter star. This was discovered by T. J. J. See in 1897.[10]

  1. ^ a b c d e f g h Cite error: The named reference Gaia DR2 was invoked but never defined (see the help page).
  2. ^ a b c d e f g 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 houk1979 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Malaroda1975 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference deVaucoleurs1957 was invoked but never defined (see the help page).
  6. ^ a b c d Cite error: The named reference David_Hillenbrand_2015 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Reiners2006 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Simbad was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Kunzli_North_1998 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Mason_et_al_2014 was invoked but never defined (see the help page).