Kappa Volantis
Quadruple star system in the constellation Volans
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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.
 | |
| 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.