Kappa Volantis

Kappa Volantis, Latinized from κ Volantis, is a quadruple star system^[16] in the southern constellation of Volans. The primary component has an apparent visual magnitude of 5.37, while the secondary companion is magnitude 5.65;^[2] individually, both a bright enough to be faintly visible to the naked eye. Based upon parallax measurements, the stars appear to be around 420−430 light-years from the Sun.

κ Volantis

Location of κ Volantis
Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Volans
κ1 Vol
Right ascension	08h 19m 48.96447s[1]
Declination	−71° 30′ 53.6692″[1]
Apparent magnitude (V)	5.37[2]
κ2 Vol
Right ascension	08h 20m 00.52661s[1]
Declination	−71° 30′ 19.3664″[1]
Apparent magnitude (V)	5.65[2]
Characteristics
κ1 Vol
Spectral type	B9III/IV[3]
U−B color index	−0.31[2]
B−V color index	−0.06[2]
κ2 Vol
Spectral type	B9/A0IV[3]
U−B color index	−0.31[2]
B−V color index	−0.10[2]
Astrometry
κ1 Vol
Radial velocity (Rv)	36.0[4] km/s
Proper motion (μ)	RA: −16.89[1] mas/yr Dec.: +36.26[1] mas/yr
Parallax (π)	7.50±0.35 mas[1]
Distance	430 ± 20 ly (133 ± 6 pc)
Absolute magnitude (MV)	−0.29[5]
κ2 Vol
Radial velocity (Rv)	−6.50[4] km/s
Proper motion (μ)	RA: −17.71[1] mas/yr Dec.: +34.10[1] mas/yr
Parallax (π)	7.79±0.21 mas[1]
Distance	420 ± 10 ly (128 ± 3 pc)
Absolute magnitude (MV)	+0.09[5]
Details
κ1 Vol
Mass	2.7±0.3[6] M☉
Radius	3.83±0.65[7] R☉
Luminosity	129[8] L☉
Surface gravity (log g)	3.77±0.09[6] cgs
Temperature	9,884[8] K
Metallicity [Fe/H]	−0.20+0.36 −0.25[6] dex
Rotational velocity (v sin i)	80[9] km/s
κ2 Vol
Mass	3.03[10] M☉
Radius	3.01[10] R☉
Luminosity	124[8] L☉
Surface gravity (log g)	4.19[10] cgs
Temperature	11,682[8] K
Metallicity [Fe/H]	+0.69±0.15[11] dex
Rotation	1.29641[12] d
Rotational velocity (v sin i)	2[13] km/s
Age	120[10] Myr
Other designations
κ Vol, WDS J08198-7131[14]
κ1 Vol: CPD−71°677, HD 71046, HIP 40817, HR 3301, SAO 256497[14]
κ2 Vol: CPD−71° 678, HD 71066, HIP 40834, HR 3302, SAO 256499.[15]
Database references
SIMBAD	κ1 Vol
	κ2 Vol

Properties

The brightest component, κ¹ Volantis, is a blue-white B-type star with a stellar classification showing characteristics of a both a subgiant and giant star. It has an unseen companion, and the pair form a single-lined spectroscopic binary.^[16] The star has nearly three times the Sun's mass, and 3.8 times its radius. It radiates at 129 times the Sun's luminosity from its photosphere at an effective temperature of 9,884 K.

Companion

Separated from κ¹ Volantis by 65 arcseconds, κ² Volantis is a white subgiant star that falls between a B-type and A-type classification. The system's fourth component, κ Volantis C, is a magnitude +8.5 star 37.7 arcseconds away from κ² Volantis.