Experiments in Expression · Ideas of Curiosity

HD 143699

Source: wikipedia https://en.wikipedia.org/wiki/HD_143699

S P A C E | ‘HD 143699’

I will email about this, for members of S P A C E.

Cool.

 

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]
Distance 350 ± 20 ly
(108 ± 6 pc)
Absolute magnitude (MV) −0.54[2]
Details
Mass 4.31±0.07[4] M
Radius 4.4[5] R
Luminosity 438+39
−36
[4] L
Temperature 14521+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
SIMBAD data

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 OB2moving 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]