HD 143699

HD 143699
Observation data
Epoch J2000      Equinox J2000
Constellation Lupus
Right ascension 16h 03m 24.18956s[1]
Declination −38° 36′ 09.1424″[1]
Apparent magnitude (V) 4.90[2]
Characteristics
Spectral type B5/7 III/IV[3]
B−V color index −0.146±0.043[2]
Astrometry
Radial velocity (Rv)−1.9±2.8[2] km/s
Proper motion (μ) RA: −18.488[1] mas/yr
Dec.: −28.147[1] mas/yr
Parallax (π)9.2268 ± 0.4693 mas[1]
Distance350 ± 20 ly
(108 ± 6 pc)
Absolute magnitude (MV)−0.54[2]
Details
Mass4.31±0.07[4] M☉
Radius4.4[5] R☉
Luminosity438+39
−36[4] L☉
Temperature14521+202
−401[4] K
Rotational velocity (v sin i)123[4] km/s
Other designations
CD−38°10832, FK5 3267, HD 143699, HIP 78655, HR 5967, SAO 207276[6]
Database references
SIMBADdata

HD 143699 is a single[7] star in the southern constellation of Lupus. It is a dim star but visible to the naked eye with an apparent visual magnitude of 4.90.[2] Based upon an annual parallax shift of 9.2 mas,[1] it is located around 350 light years away. It is most likely (90%[8] chance) a member of the Upper Centaurus–Lupus[9] subgroup of the Sco OB2 moving group.

This star has a stellar classification of B5/7 III/IV,[3] suggesting it is an evolving star that is entering the giant stage. However, according to Zorec and Royer (2012) it is only 56% of the way through its main sequence lifespan.[4] It is a chemically peculiar magnetic B star,[10] showing an averaged quadratic field strength of (167.2±140.4)×10−3 T.[11] Helium-weak, it displays an underabundance of helium in its spectrum.[12] Radio emissions have been detected from this source.[10]

HD 143699 has 4.3[4] times the mass of the Sun and 4.4[5] times the Sun's radius. It has a high rate of spin with a projected rotational velocity of 123 km/s.[4] The star is radiating 438[4] times the Sun's luminosity from its photosphere at an effective temperature of 14,521 K.[4]

  1. ^ a b c d e f Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d e Cite error: The named reference Anderson2012 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 c d e f g h i Cite error: The named reference zorec2012 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference cadars was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Rizzuto2011 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Bobylev2007 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference Linsky1992 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference bychkov2009 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Kilambi1992 was invoked but never defined (see the help page).