Kappa Mensae

κ Mensae
Location of κ Mensae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Mensa
Right ascension 05h 50m 16.7857s[1]
Declination −79° 21′ 40.900″[1]
Apparent magnitude (V) 5.45 ± 0.01[2]
Characteristics
Evolutionary stage main sequence[3]
Spectral type B9 V[4]
U−B color index −0.24[5]
B−V color index −0.08[5]
Astrometry
Radial velocity (Rv)9.5 ± 2[6] km/s
Proper motion (μ) RA: −4.815 mas/yr[1]
Dec.: +66.518 mas/yr[1]
Parallax (π)11.018 ± 0.0604 mas[1]
Distance296 ± 2 ly
(90.8 ± 0.5 pc)
Absolute magnitude (MV)+0.78[7]
Details
Mass3.44[8] M☉
Radius1.95±0.09[9] R☉
Luminosity66.4+2.6
−2.5[3] L☉
Surface gravity (log g)4.21[8] cgs
Temperature10,965±50[3] K
Metallicity [Fe/H]0.00[10] dex
Rotational velocity (v sin i)290[11] km/s
Age115[8] Myr
Other designations
κ Mensae, 32 G. Mensae, CPD−79° 202, HD 40953, HIP 27566, HR 2125, SAO 256248[12][13]
Database references
SIMBADdata

Kappa Mensae, Latinized from κ Mensae, is a solitary[14] star in the southern circumpolar constellation Mensa. Its distance of 296 light years[1] based on its parallax shift gives it an apparent magnitude of 5.45,[2] making it faintly visible to the naked eye. However, it is receding from the Sun with a heliocentric radial velocity of 9.5 km/s.[6]

Kappa Mensae has a stellar classification of B9 V,[4] indicating that it is an ordinary B-type main-sequence star. At present it has 3.44 times the mass of the Sun[8] and a diameter of 1.95 R☉.[9] It radiates at 66[3] times the luminosity from its photosphere at an effective temperature of 10,965 K,[3] giving it a bluish white hue. The star is very young, aged 115 million years,[8] having completed only 33.7% of its main sequence lifetime.[3] Kappa Mensae has a high rate of spin, rotating with a projected rotational velocity of 290 km/s.[11]

  1. ^ a b c d e Cite error: The named reference GaiaEDR3 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 c d e f Cite error: The named reference Zorec2012 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Houk1975 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Johnson1966 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Evans1967 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference XHIP was invoked but never defined (see the help page).
  8. ^ a b c d e Cite error: The named reference David2015 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference A.P1999 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Gontcharov2012 was invoked but never defined (see the help page).
  11. ^ a b Cite error: The named reference Levato2004 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference SIMBAD 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 Eggleton2008 was invoked but never defined (see the help page).