Kappa1 Lupi

For other stars with this Bayer designation, see κ Lupi.
Kappa1 Lupi
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Lupus
Right ascension 15h 11m 56.07286s[1]
Declination −48° 44′ 16.1692″[1]
Apparent magnitude (V) 3.86[2]
Characteristics
Spectral type B9.5 Vne[3]
U−B color index −0.08[2]
B−V color index −0.05[2]
Astrometry
Radial velocity (Rv)−6.6±2.9[4] km/s
Proper motion (μ) RA: −96.50[1] mas/yr
Dec.: −49.86[1] mas/yr
Parallax (π)18.12 ± 0.47 mas[1]
Distance180 ± 5 ly
(55 ± 1 pc)
Details
Mass2.89±0.03[5] M☉
Radius2.3[6] R☉
Luminosity151[3] L☉
Surface gravity (log g)3.99±0.14[7] cgs
Temperature11,305±384[7] K
Rotational velocity (v sin i)191±16[5] km/s
Age121[7] Myr
Other designations
κ1 Lup, CD−48° 9704, FK5 1398, HD 134481, HIP 74376, HR 5646, SAO 225525.[8]
Database references
SIMBADdata

Kappa1 Lupi is a solitary[9] star in the southern constellation of Lupus. It is visible to the naked eye with an apparent visual magnitude of 3.86,[2] and forms a double star with Kappa2 Lupi.[10] Based upon an annual parallax shift of 18.12[1] mas as seen from Earth, it is located about 180 light years from the Sun. Both Kappa1 Lupi and its neighbor Kappa2 Lupi are members of the Hyades Stream, which is a moving group that is coincident with the proper motions of the Hyades cluster.[11]

This is a B-type main sequence star with a stellar classification of B9.5 Vne.[3] The 'n' suffix indicates the spectrum shows "nebulous" absorption lines due to rapid rotation, while the 'e' means this is a Be star that displays Balmer series emission lines. With an estimated age of 195[3] million years, it is about 75% of the way through its life span on the main sequence.[5] The star is rotating with a projected rotational velocity of 191 km/s.[5] This rate of spin is giving the star an oblate shape with an equatorial bulge that is an estimated 9% larger than the polar radius.[12]

In Chinese astronomy, Kappa1 Lupi is called 騎陣將軍, Pinyin: Qízhènjiāngjūn, meaning Chariots and Cavalry General, because this star is marking itself and stand alone in Chariots and Cavalry General asterism, Root mansion (see : Chinese constellation).[13]

  1. ^ a b c d e f Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Mermilliod1986 was invoked but never defined (see the help page).
  3. ^ a b c d Cite error: The named reference levenhagen2006 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference deBruijne2012 was invoked but never defined (see the help page).
  5. ^ a b c d Cite error: The named reference Zorec2012 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference PasinettiFracassini2001 was invoked but never defined (see the help page).
  7. ^ a b c Cite error: The named reference David2015 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. ^ Cite error: The named reference chini2012 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference eggen1996 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference belle2012 was invoked but never defined (see the help page).
  13. ^ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 6 月 29 日